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[PATCH v2 01/10] Initial TI PRU GCC port


ChangeLog:

2018-07-27  Dimitar Dimitrov  <dimitar@dinux.eu>

	* configure: Regenerate.
	* configure.ac: Add PRU target.

gcc/ChangeLog:

2018-07-27  Dimitar Dimitrov  <dimitar@dinux.eu>

	* common/config/pru/pru-common.c: New file.
	* config.gcc: Add PRU target.
	* config/pru/alu-zext.md: New file.
	* config/pru/constraints.md: New file.
	* config/pru/predicates.md: New file.
	* config/pru/pru-opts.h: New file.
	* config/pru/pru-passes.c: New file.
	* config/pru/pru-pragma.c: New file.
	* config/pru/pru-protos.h: New file.
	* config/pru/pru.c: New file.
	* config/pru/pru.h: New file.
	* config/pru/pru.md: New file.
	* config/pru/pru.opt: New file.
	* config/pru/t-pru: New file.
	* doc/extend.texi: Document PRU pragmas.
	* doc/invoke.texi: Document PRU-specific options.
	* doc/md.texi: Document PRU asm constraints.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
---
 configure.ac                       |    7 +
 gcc/common/config/pru/pru-common.c |   36 +
 gcc/config.gcc                     |    9 +
 gcc/config/pru/alu-zext.md         |  178 +++
 gcc/config/pru/constraints.md      |   88 ++
 gcc/config/pru/predicates.md       |  224 +++
 gcc/config/pru/pru-opts.h          |   31 +
 gcc/config/pru/pru-passes.c        |  234 +++
 gcc/config/pru/pru-pragma.c        |   90 ++
 gcc/config/pru/pru-protos.h        |   72 +
 gcc/config/pru/pru.c               | 2998 ++++++++++++++++++++++++++++++++++++
 gcc/config/pru/pru.h               |  551 +++++++
 gcc/config/pru/pru.md              |  956 ++++++++++++
 gcc/config/pru/pru.opt             |   53 +
 gcc/config/pru/t-pru               |   31 +
 gcc/doc/extend.texi                |   20 +
 gcc/doc/invoke.texi                |   55 +
 gcc/doc/md.texi                    |   22 +
 18 files changed, 5655 insertions(+)
 create mode 100644 gcc/common/config/pru/pru-common.c
 create mode 100644 gcc/config/pru/alu-zext.md
 create mode 100644 gcc/config/pru/constraints.md
 create mode 100644 gcc/config/pru/predicates.md
 create mode 100644 gcc/config/pru/pru-opts.h
 create mode 100644 gcc/config/pru/pru-passes.c
 create mode 100644 gcc/config/pru/pru-pragma.c
 create mode 100644 gcc/config/pru/pru-protos.h
 create mode 100644 gcc/config/pru/pru.c
 create mode 100644 gcc/config/pru/pru.h
 create mode 100644 gcc/config/pru/pru.md
 create mode 100644 gcc/config/pru/pru.opt
 create mode 100644 gcc/config/pru/t-pru

diff --git a/configure.ac b/configure.ac
index a0b0917dd55..11c9f72fc64 100644
--- a/configure.ac
+++ b/configure.ac
@@ -640,6 +640,10 @@ case "${target}" in
   powerpc-*-aix* | rs6000-*-aix*)
     noconfigdirs="$noconfigdirs target-libssp"
     ;;
+  pru-*-*)
+    # No hosted I/O support.
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
   rl78-*-*)
     # libssp uses a misaligned load to trigger a fault, but the RL78
     # doesn't fault for those - instead, it gives a build-time error
@@ -824,6 +828,9 @@ case "${target}" in
   powerpc*-*-*)
     libgloss_dir=rs6000
     ;;
+  pru-*-*)
+    libgloss_dir=pru
+    ;;
   sparc*-*-*)
     libgloss_dir=sparc
     ;;
diff --git a/gcc/common/config/pru/pru-common.c b/gcc/common/config/pru/pru-common.c
new file mode 100644
index 00000000000..e87d70ce9ca
--- /dev/null
+++ b/gcc/common/config/pru/pru-common.c
@@ -0,0 +1,36 @@
+/* Common hooks for TI PRU
+   Copyright (C) 2014-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "diagnostic-core.h"
+#include "tm.h"
+#include "common/common-target.h"
+#include "common/common-target-def.h"
+#include "opts.h"
+#include "flags.h"
+
+#undef TARGET_DEFAULT_TARGET_FLAGS
+#define TARGET_DEFAULT_TARGET_FLAGS		(MASK_OPT_LOOP)
+
+#undef TARGET_EXCEPT_UNWIND_INFO
+#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
+
+struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
diff --git a/gcc/config.gcc b/gcc/config.gcc
index 78e84c2b864..818949f9119 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -493,6 +493,9 @@ powerpc*-*-*)
 	esac
 	extra_options="${extra_options} g.opt fused-madd.opt rs6000/rs6000-tables.opt"
 	;;
+pru-*-*)
+	cpu_type=pru
+	;;
 riscv*)
 	cpu_type=riscv
 	extra_objs="riscv-builtins.o riscv-c.o"
@@ -2635,6 +2638,12 @@ powerpcle-*-eabi*)
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	use_gcc_stdint=wrap
 	;;
+pru*-*-*)
+	tm_file="elfos.h newlib-stdint.h ${tm_file}"
+	tmake_file="${tmake_file} pru/t-pru"
+	extra_objs="pru-pragma.o pru-passes.o"
+	use_gcc_stdint=wrap
+	;;
 rs6000-ibm-aix4.[3456789]* | powerpc-ibm-aix4.[3456789]*)
 	tm_file="rs6000/biarch64.h ${tm_file} rs6000/aix.h rs6000/aix43.h rs6000/xcoff.h rs6000/aix-stdint.h"
 	tmake_file="rs6000/t-aix43 t-slibgcc"
diff --git a/gcc/config/pru/alu-zext.md b/gcc/config/pru/alu-zext.md
new file mode 100644
index 00000000000..2112b08d3f4
--- /dev/null
+++ b/gcc/config/pru/alu-zext.md
@@ -0,0 +1,178 @@
+;; ALU operations with zero extensions
+;;
+;; Copyright (C) 2015-2018 Free Software Foundation, Inc.
+;; Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_subst_attr "alu2_zext"     "alu2_zext_subst"     "_z" "_noz")
+
+(define_subst_attr "alu3_zext_op1" "alu3_zext_op1_subst" "_z1" "_noz1")
+(define_subst_attr "alu3_zext_op2" "alu3_zext_op2_subst" "_z2" "_noz2")
+(define_subst_attr "alu3_zext"     "alu3_zext_subst"     "_z" "_noz")
+
+(define_subst_attr "bitalu_zext"   "bitalu_zext_subst"   "_z" "_noz")
+
+(define_code_iterator ALUOP3 [plus minus and ior xor umin umax ashift lshiftrt])
+(define_code_iterator ALUOP2 [neg not])
+
+;; Arithmetic Operations
+
+(define_insn "add_impl<EQD:mode><EQS0:mode><EQS1:mode>_<alu3_zext><alu3_zext_op1><alu3_zext_op2>"
+  [(set (match_operand:EQD 0 "register_operand" "=r,r,r")
+	(plus:EQD
+	 (zero_extend:EQD
+	  (match_operand:EQS0 1 "register_operand" "%r,r,r"))
+	 (zero_extend:EQD
+	  (match_operand:EQS1 2 "nonmemory_operand" "r,I,M"))))]
+  ""
+  "@
+   add\\t%0, %1, %2
+   add\\t%0, %1, %2
+   sub\\t%0, %1, %n2"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+(define_insn "sub_impl<EQD:mode><EQS0:mode><EQS1:mode>_<alu3_zext><alu3_zext_op1><alu3_zext_op2>"
+  [(set (match_operand:EQD 0 "register_operand" "=r,r,r")
+	(minus:EQD
+	 (zero_extend:EQD
+	  (match_operand:EQS0 1 "reg_or_ubyte_operand" "r,r,I"))
+	 (zero_extend:EQD
+	  (match_operand:EQS1 2 "reg_or_ubyte_operand" "r,I,r"))))]
+  ""
+  "@
+   sub\\t%0, %1, %2
+   sub\\t%0, %1, %2
+   rsb\\t%0, %2, %1"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+
+(define_insn "neg_impl<EQD:mode><EQS0:mode>_<alu2_zext>"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(neg:EQD
+	  (zero_extend:EQD (match_operand:EQS0 1 "register_operand" "r"))))]
+  ""
+  "rsb\\t%0, %1, 0"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+
+(define_insn "one_impl<EQD:mode><EQS0:mode>_<alu2_zext>"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(not:EQD
+	  (zero_extend:EQD (match_operand:EQS0 1 "register_operand" "r"))))]
+  ""
+  "not\\t%0, %1"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+; Specialized IOR/AND patterns for matching setbit/clearbit instructions.
+;
+; TODO - allow clrbit and setbit to support (1 << REG) constructs
+
+(define_insn "clearbit_<EQD:mode><EQS0:mode>_<bitalu_zext>"
+  [(set (match_operand:EQD 0 "register_operand"	"=r")
+	(and:EQD
+	  (zero_extend:EQD
+	    (match_operand:EQS0 1 "register_operand" "r"))
+	  (match_operand:EQD 2 "single_zero_operand" "n")))]
+  ""
+  "clr\\t%0, %1, %V2"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+(define_insn "setbit_<EQD:mode><EQS0:mode>_<bitalu_zext>"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(ior:EQD
+	  (zero_extend:EQD
+	    (match_operand:EQS0 1 "register_operand" "r"))
+	  (match_operand:EQD 2 "single_one_operand" "n")))]
+  ""
+  "set\\t%0, %1, %T2"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+; Regular ALU ops
+(define_insn "<code>_impl<EQD:mode><EQS0:mode><EQS1:mode>_<alu3_zext><alu3_zext_op1><alu3_zext_op2>"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(LOGICAL:EQD
+	  (zero_extend:EQD
+	    (match_operand:EQS0 1 "register_operand"     "%r"))
+	  (zero_extend:EQD
+	    (match_operand:EQS1 2 "reg_or_ubyte_operand"  "rI"))))]
+  ""
+  "<logical_asm>\\t%0, %1, %2"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+; Shift ALU ops
+(define_insn "<shift_op>_impl<EQD:mode><EQS0:mode><EQS1:mode>_<alu3_zext><alu3_zext_op1><alu3_zext_op2>"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(SHIFT:EQD
+	 (zero_extend:EQD (match_operand:EQS0 1 "register_operand" "r"))
+	 (zero_extend:EQD (match_operand:EQS1 2 "shift_operand"    "rL"))))]
+  ""
+  "<shift_asm>\\t%0, %1, %2"
+  [(set_attr "type" "alu")
+   (set_attr "length" "4")])
+
+;; Substitutions
+
+(define_subst "alu2_zext_subst"
+  [(set (match_operand:EQD 0 "" "")
+	(ALUOP2:EQD (zero_extend:EQD (match_operand:EQD 1 "" ""))))]
+  ""
+  [(set (match_dup 0)
+	(ALUOP2:EQD (match_dup 1)))])
+
+(define_subst "bitalu_zext_subst"
+  [(set (match_operand:EQD 0 "" "")
+	(ALUOP3:EQD (zero_extend:EQD (match_operand:EQD 1 "" ""))
+		    (match_operand:EQD 2 "" "")))]
+  ""
+  [(set (match_dup 0)
+	(ALUOP3:EQD (match_dup 1)
+		    (match_dup 2)))])
+
+(define_subst "alu3_zext_subst"
+  [(set (match_operand:EQD 0 "" "")
+	(ALUOP3:EQD (zero_extend:EQD (match_operand:EQD 1 "" ""))
+		    (zero_extend:EQD (match_operand:EQD 2 "" ""))))]
+  ""
+  [(set (match_dup 0)
+	(ALUOP3:EQD (match_dup 1)
+		    (match_dup 2)))])
+
+(define_subst "alu3_zext_op1_subst"
+  [(set (match_operand:EQD 0 "" "")
+	(ALUOP3:EQD (zero_extend:EQD (match_operand:EQD 1 "" ""))
+		    (zero_extend:EQD (match_operand:EQS1 2 "" ""))))]
+  ""
+  [(set (match_dup 0)
+	(ALUOP3:EQD (match_dup 1)
+		    (zero_extend:EQD (match_dup 2))))])
+
+(define_subst "alu3_zext_op2_subst"
+  [(set (match_operand:EQD 0 "" "")
+	(ALUOP3:EQD (zero_extend:EQD (match_operand:EQS0 1 "" ""))
+		    (zero_extend:EQD (match_operand:EQD 2 "" ""))))]
+  ""
+  [(set (match_dup 0)
+	(ALUOP3:EQD (zero_extend:EQD (match_dup 1))
+		    (match_dup 2)))])
diff --git a/gcc/config/pru/constraints.md b/gcc/config/pru/constraints.md
new file mode 100644
index 00000000000..326c8e9907c
--- /dev/null
+++ b/gcc/config/pru/constraints.md
@@ -0,0 +1,88 @@
+;; Constraint definitions for TI PRU.
+;; Copyright (C) 2014-2018 Free Software Foundation, Inc.
+;; Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+;; We use the following constraint letters for constants:
+;;
+;;  I: 0 to 255.
+;;  J: 0 to 65535.
+;;  L: 0 to 31 (for shift counts).
+;;  M: -255 to 0 (for converting ADD to SUB with suitable UBYTE OP2).
+;;  N: -32768 to 32767 (16-bit signed integer)
+;;  P: 1
+;;  T: Text segment label.  Needed to know when to select %pmem relocation.
+;;  Z: Constant integer zero.
+;;
+;; We use the following built-in register classes:
+;;
+;;  r: general purpose register (r0..r31)
+;;  m: memory operand
+;;
+;; The following constraints are intended for internal use only:
+;;  j: jump address register suitable for sibling calls
+;;  l: the internal counter register used by LOOP instructions
+
+;; Register constraints.
+
+(define_register_constraint "j" "SIB_REGS"
+  "A register suitable for an indirect sibcall.")
+
+(define_register_constraint "l" "LOOPCNTR_REGS"
+  "The internal counter register used by the LOOP instruction.")
+
+;; Integer constraints.
+
+(define_constraint "I"
+  "An unsigned 8-bit constant."
+  (and (match_code "const_int")
+       (match_test "UBYTE_INT (ival)")))
+
+(define_constraint "J"
+  "An unsigned 16-bit constant."
+  (and (match_code "const_int")
+       (match_test "UHWORD_INT (ival)")))
+
+(define_constraint "L"
+  "An unsigned 5-bit constant (for shift counts)."
+  (and (match_code "const_int")
+       (match_test "ival >= 0 && ival <= 31")))
+
+(define_constraint "M"
+  "A constant in the range [-255;0]."
+  (and (match_code "const_int")
+       (match_test "UBYTE_INT (-ival)")))
+
+(define_constraint "N"
+  "A constant in the range [-32768;32767]."
+  (and (match_code "const_int")
+       (match_test "SHWORD_INT (ival)")))
+
+(define_constraint "P"
+  "A constant 1."
+  (and (match_code "const_int")
+       (match_test "ival == 1")))
+
+(define_constraint "T"
+  "A text segment (program memory) constant label."
+  (match_test "text_segment_operand (op, VOIDmode)"))
+
+(define_constraint "Z"
+  "An integer constant zero."
+  (and (match_code "const_int")
+       (match_test "ival == 0")))
diff --git a/gcc/config/pru/predicates.md b/gcc/config/pru/predicates.md
new file mode 100644
index 00000000000..78fdb8a25b7
--- /dev/null
+++ b/gcc/config/pru/predicates.md
@@ -0,0 +1,224 @@
+;; Predicate definitions for TI PRU.
+;; Copyright (C) 2014-2018 Free Software Foundation, Inc.
+;; Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_predicate "const_1_operand"
+  (and (match_code "const_int")
+       (match_test "IN_RANGE (INTVAL (op), 1, 1)")))
+
+(define_predicate "const_ubyte_operand"
+  (and (match_code "const_int")
+       (match_test "IN_RANGE (INTVAL (op), 0, 0xff)")))
+
+(define_predicate "const_uhword_operand"
+  (and (match_code "const_int")
+       (match_test "IN_RANGE (INTVAL (op), 0, 0xffff)")))
+
+; TRUE for comparisons we support.
+(define_predicate "pru_cmp_operator"
+  (match_code "eq,ne,leu,ltu,geu,gtu"))
+
+; TRUE for signed comparisons that need special handling for PRU.
+(define_predicate "pru_signed_cmp_operator"
+  (match_code "ge,gt,le,lt"))
+
+;; FP Comparisons handled by pru_expand_pru_compare.
+(define_predicate "pru_fp_comparison_operator"
+  (match_code "eq,lt,gt,le,ge"))
+
+;; Return true if OP is a constant that contains only one 1 in its
+;; binary representation.
+(define_predicate "single_one_operand"
+  (and (match_code "const_int")
+       (match_test "exact_log2 (INTVAL (op) & GET_MODE_MASK (mode)) >= 0")))
+
+;; Return true if OP is a constant that contains only one 0 in its
+;; binary representation.
+(define_predicate "single_zero_operand"
+  (and (match_code "const_int")
+       (match_test "exact_log2 (~INTVAL (op) & GET_MODE_MASK (mode)) >= 0")))
+
+
+(define_predicate "reg_or_ubyte_operand"
+  (ior (match_operand 0 "const_ubyte_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "reg_or_const_1_operand"
+  (ior (match_operand 0 "const_1_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "const_shift_operand"
+  (and (match_code "const_int")
+       (match_test "SHIFT_INT (INTVAL (op))")))
+
+(define_predicate "shift_operand"
+  (ior (match_operand 0 "const_shift_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "ctable_addr_operand"
+  (and (match_code "const_int")
+       (match_test ("(pru_get_ctable_base_index (INTVAL (op)) >= 0)"))))
+
+(define_predicate "ctable_base_operand"
+  (and (match_code "const_int")
+       (match_test ("(pru_get_ctable_exact_base_index (INTVAL (op)) >= 0)"))))
+
+;; Ideally we should enforce a restriction to all text labels to fit in
+;; 16bits, as required by the PRU ISA.  But for the time being we'll rely on
+;; binutils to catch text segment overflows.
+(define_predicate "call_operand"
+  (ior (match_operand 0 "immediate_operand")
+       (match_operand 0 "register_operand")))
+
+;; Return true if OP is a text segment reference.
+;; This is needed for program memory address expressions.  Borrowed from AVR.
+(define_predicate "text_segment_operand"
+  (match_code "code_label,label_ref,symbol_ref,plus,minus,const")
+{
+  switch (GET_CODE (op))
+    {
+    case CODE_LABEL:
+      return true;
+    case LABEL_REF :
+      return true;
+    case SYMBOL_REF :
+      return SYMBOL_REF_FUNCTION_P (op);
+    case PLUS :
+    case MINUS :
+      /* Assume canonical format of symbol + constant.
+	 Fall through.  */
+    case CONST :
+      return text_segment_operand (XEXP (op, 0), VOIDmode);
+    default :
+      return false;
+    }
+})
+
+;; Return true if OP is a load multiple operation.  It is known to be a
+;; PARALLEL and the first section will be tested.
+
+(define_special_predicate "load_multiple_operation"
+  (match_code "parallel")
+{
+  machine_mode elt_mode;
+  int count = XVECLEN (op, 0);
+  unsigned int dest_regno;
+  rtx src_addr;
+  int i, off;
+
+  /* Perform a quick check so we don't blow up below.  */
+  if (GET_CODE (XVECEXP (op, 0, 0)) != SET
+      || GET_CODE (SET_DEST (XVECEXP (op, 0, 0))) != REG
+      || GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) != MEM)
+    return false;
+
+  dest_regno = REGNO (SET_DEST (XVECEXP (op, 0, 0)));
+  src_addr = XEXP (SET_SRC (XVECEXP (op, 0, 0)), 0);
+  elt_mode = GET_MODE (SET_DEST (XVECEXP (op, 0, 0)));
+
+  /* Check, is base, or base + displacement.  */
+
+  if (GET_CODE (src_addr) == REG)
+    off = 0;
+  else if (GET_CODE (src_addr) == PLUS
+	   && GET_CODE (XEXP (src_addr, 0)) == REG
+	   && GET_CODE (XEXP (src_addr, 1)) == CONST_INT)
+    {
+      off = INTVAL (XEXP (src_addr, 1));
+      src_addr = XEXP (src_addr, 0);
+    }
+  else
+    return false;
+
+  for (i = 1; i < count; i++)
+    {
+      rtx elt = XVECEXP (op, 0, i);
+
+      if (GET_CODE (elt) != SET
+	  || GET_CODE (SET_DEST (elt)) != REG
+	  || GET_MODE (SET_DEST (elt)) != elt_mode
+	  || REGNO (SET_DEST (elt)) != dest_regno + i
+	  || GET_CODE (SET_SRC (elt)) != MEM
+	  || GET_MODE (SET_SRC (elt)) != elt_mode
+	  || GET_CODE (XEXP (SET_SRC (elt), 0)) != PLUS
+	  || ! rtx_equal_p (XEXP (XEXP (SET_SRC (elt), 0), 0), src_addr)
+	  || GET_CODE (XEXP (XEXP (SET_SRC (elt), 0), 1)) != CONST_INT
+	  || INTVAL (XEXP (XEXP (SET_SRC (elt), 0), 1))
+	     != off + i * GET_MODE_SIZE (elt_mode))
+	return false;
+    }
+
+  return true;
+})
+
+;; Return true if OP is a store multiple operation.  It is known to be a
+;; PARALLEL and the first section will be tested.
+
+(define_special_predicate "store_multiple_operation"
+  (match_code "parallel")
+{
+  machine_mode elt_mode;
+  int count = XVECLEN (op, 0);
+  unsigned int src_regno;
+  rtx dest_addr;
+  int i, off;
+
+  /* Perform a quick check so we don't blow up below.  */
+  if (GET_CODE (XVECEXP (op, 0, 0)) != SET
+      || GET_CODE (SET_DEST (XVECEXP (op, 0, 0))) != MEM
+      || GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) != REG)
+    return false;
+
+  src_regno = REGNO (SET_SRC (XVECEXP (op, 0, 0)));
+  dest_addr = XEXP (SET_DEST (XVECEXP (op, 0, 0)), 0);
+  elt_mode = GET_MODE (SET_SRC (XVECEXP (op, 0, 0)));
+
+  /* Check, is base, or base + displacement.  */
+
+  if (GET_CODE (dest_addr) == REG)
+    off = 0;
+  else if (GET_CODE (dest_addr) == PLUS
+	   && GET_CODE (XEXP (dest_addr, 0)) == REG
+	   && GET_CODE (XEXP (dest_addr, 1)) == CONST_INT)
+    {
+      off = INTVAL (XEXP (dest_addr, 1));
+      dest_addr = XEXP (dest_addr, 0);
+    }
+  else
+    return false;
+
+  for (i = 1; i < count; i++)
+    {
+      rtx elt = XVECEXP (op, 0, i);
+
+      if (GET_CODE (elt) != SET
+	  || GET_CODE (SET_SRC (elt)) != REG
+	  || GET_MODE (SET_SRC (elt)) != elt_mode
+	  || REGNO (SET_SRC (elt)) != src_regno + i
+	  || GET_CODE (SET_DEST (elt)) != MEM
+	  || GET_MODE (SET_DEST (elt)) != elt_mode
+	  || GET_CODE (XEXP (SET_DEST (elt), 0)) != PLUS
+	  || ! rtx_equal_p (XEXP (XEXP (SET_DEST (elt), 0), 0), dest_addr)
+	  || GET_CODE (XEXP (XEXP (SET_DEST (elt), 0), 1)) != CONST_INT
+	  || INTVAL (XEXP (XEXP (SET_DEST (elt), 0), 1))
+	     != off + i * GET_MODE_SIZE (elt_mode))
+	return false;
+    }
+  return true;
+})
diff --git a/gcc/config/pru/pru-opts.h b/gcc/config/pru/pru-opts.h
new file mode 100644
index 00000000000..1c1514cb2a3
--- /dev/null
+++ b/gcc/config/pru/pru-opts.h
@@ -0,0 +1,31 @@
+/* Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Definitions for option handling for PRU.  */
+
+#ifndef GCC_PRU_OPTS_H
+#define GCC_PRU_OPTS_H
+
+/* ABI variant for code generation.  */
+enum pru_abi {
+    PRU_ABI_GNU,
+    PRU_ABI_TI
+};
+
+#endif
diff --git a/gcc/config/pru/pru-passes.c b/gcc/config/pru/pru-passes.c
new file mode 100644
index 00000000000..c95dc877722
--- /dev/null
+++ b/gcc/config/pru/pru-passes.c
@@ -0,0 +1,234 @@
+/* PRU target specific passes
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+   Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "context.h"
+#include "tm.h"
+#include "alias.h"
+#include "symtab.h"
+#include "tree.h"
+#include "diagnostic-core.h"
+#include "function.h"
+#include "gimple.h"
+#include "gimple-iterator.h"
+#include "gimple-walk.h"
+#include "gimple-expr.h"
+#include "tree-pass.h"
+#include "gimple-pretty-print.h"
+
+#include "pru-protos.h"
+
+namespace {
+
+/* Scan the tree to ensure that the compiled code by GCC
+   conforms to the TI ABI specification.  If GCC cannot
+   output a conforming code, raise an error.  */
+const pass_data pass_data_tiabi_check =
+{
+  GIMPLE_PASS, /* type */
+  "*tiabi_check", /* name */
+  OPTGROUP_NONE, /* optinfo_flags */
+  TV_NONE, /* tv_id */
+  PROP_gimple_any, /* properties_required */
+  0, /* properties_provided */
+  0, /* properties_destroyed */
+  0, /* todo_flags_start */
+  0, /* todo_flags_finish */
+};
+
+/* Implementation class for the TI ABI compliance-check pass.  */
+class pass_tiabi_check : public gimple_opt_pass
+{
+public:
+  pass_tiabi_check (gcc::context *ctxt)
+    : gimple_opt_pass (pass_data_tiabi_check, ctxt)
+  {}
+
+  /* opt_pass methods: */
+  virtual unsigned int execute (function *);
+
+  virtual bool gate (function *fun ATTRIBUTE_UNUSED)
+  {
+    return pru_current_abi == PRU_ABI_TI;
+  }
+
+}; // class pass_tiabi_check
+
+/* Return 1 if type TYPE is a pointer to function type or a
+   structure having a pointer to function type as one of its fields.
+   Otherwise return 0.  */
+static bool
+chkp_type_has_function_pointer (const_tree type)
+{
+  bool res = false;
+
+  if (POINTER_TYPE_P (type) && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (type)))
+    res = true;
+  else if (RECORD_OR_UNION_TYPE_P (type))
+    {
+      tree field;
+
+      for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
+	if (TREE_CODE (field) == FIELD_DECL)
+	  res = res || chkp_type_has_function_pointer (TREE_TYPE (field));
+    }
+  else if (TREE_CODE (type) == ARRAY_TYPE)
+    res = chkp_type_has_function_pointer (TREE_TYPE (type));
+
+  return res;
+}
+
+/* Check the function declaration FNTYPE for TI ABI compatibility.  */
+static void
+chk_function_decl (const_tree fntype, location_t call_location)
+{
+  /* GCC does not check if the RETURN VALUE pointer is NULL,
+     so do not allow GCC functions with large return values.  */
+  if (!VOID_TYPE_P (TREE_TYPE (fntype))
+      && pru_return_in_memory (TREE_TYPE (fntype), fntype))
+    error_at (call_location,
+	      "large return values not supported with %<-mabi=ti%> option");
+
+  /* Check this function's arguments.  */
+  for (tree p = TYPE_ARG_TYPES (fntype); p; p = TREE_CHAIN (p))
+    {
+      tree arg_type = TREE_VALUE (p);
+      if (chkp_type_has_function_pointer (arg_type))
+	{
+	  error_at (call_location,
+		    "function pointers not supported with %<-mabi=ti%> option");
+	}
+    }
+}
+
+/* Callback for walk_gimple_seq that checks TP tree for TI ABI compliance.  */
+static tree
+check_op_callback (tree *tp, int *walk_subtrees, void *data)
+{
+  struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
+
+  if (RECORD_OR_UNION_TYPE_P (*tp) || TREE_CODE (*tp) == ENUMERAL_TYPE)
+    {
+      /* Forward declarations have NULL tree type.  Skip them.  */
+      if (TREE_TYPE (*tp) == NULL)
+	return NULL;
+    }
+
+  /* TODO - why C++ leaves INTEGER_TYPE forward declarations around?  */
+  if (TREE_TYPE (*tp) == NULL)
+    return NULL;
+
+  const tree type = TREE_TYPE (*tp);
+
+  /* Direct function calls are allowed, obviously.  */
+  if (TREE_CODE (*tp) == ADDR_EXPR && TREE_CODE (type) == POINTER_TYPE)
+    {
+      const tree ptype = TREE_TYPE (type);
+      if (TREE_CODE (ptype) == FUNCTION_TYPE)
+	return NULL;
+    }
+
+  switch (TREE_CODE (type))
+    {
+    case FUNCTION_TYPE:
+    case METHOD_TYPE:
+	{
+	  /* Note: Do not enforce a small return value.  It is safe to
+	     call any TI ABI function from GCC, since GCC will
+	     never pass NULL.  */
+
+	  /* Check arguments for function pointers.  */
+	  for (tree p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
+	    {
+	      tree arg_type = TREE_VALUE (p);
+	      if (chkp_type_has_function_pointer (arg_type))
+		{
+		  error_at (gimple_location (wi->stmt), "function pointers "
+			    "not supported with %<-mabi=ti%> option");
+		}
+	    }
+	  break;
+	}
+    case RECORD_TYPE:
+    case UNION_TYPE:
+    case QUAL_UNION_TYPE:
+    case POINTER_TYPE:
+	{
+	  if (chkp_type_has_function_pointer (type))
+	    {
+	      error_at (gimple_location (wi->stmt),
+			"function pointers not supported with "
+			"%<-mabi=ti%> option");
+	      *walk_subtrees = false;
+	    }
+	  break;
+	}
+    default:
+	  break;
+    }
+  return NULL;
+}
+
+/* Pass implementation.  */
+unsigned
+pass_tiabi_check::execute (function *fun)
+{
+  struct walk_stmt_info wi;
+  const_tree fntype = TREE_TYPE (fun->decl);
+
+  gimple_seq body = gimple_body (current_function_decl);
+
+  memset (&wi, 0, sizeof (wi));
+  wi.info = NULL;
+  wi.want_locations = true;
+
+  /* Check the function body.  */
+  walk_gimple_seq (body, NULL, check_op_callback, &wi);
+
+  /* Check the function declaration.  */
+  chk_function_decl (fntype, fun->function_start_locus);
+
+  return 0;
+}
+
+} // anon namespace
+
+gimple_opt_pass *
+make_pass_tiabi_check (gcc::context *ctxt)
+{
+  return new pass_tiabi_check (ctxt);
+}
+
+/* Register as early as possible.  */
+void
+pru_register_abicheck_pass (void)
+{
+  opt_pass *tiabi_check = make_pass_tiabi_check (g);
+  struct register_pass_info tiabi_check_info
+    = { tiabi_check, "*warn_unused_result",
+	1, PASS_POS_INSERT_AFTER
+      };
+  register_pass (&tiabi_check_info);
+}
diff --git a/gcc/config/pru/pru-pragma.c b/gcc/config/pru/pru-pragma.c
new file mode 100644
index 00000000000..11cb5bd625c
--- /dev/null
+++ b/gcc/config/pru/pru-pragma.c
@@ -0,0 +1,90 @@
+/* PRU target specific pragmas
+   Copyright (C) 2015-2018 Free Software Foundation, Inc.
+   Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "alias.h"
+#include "symtab.h"
+#include "tree.h"
+#include "c-family/c-pragma.h"
+#include "c-family/c-common.h"
+#include "diagnostic-core.h"
+#include "cpplib.h"
+#include "pru-protos.h"
+
+
+/* Implements the "pragma CTABLE_ENTRY" pragma.  This pragma takes a
+   CTABLE index and an address, and instructs the compiler that
+   LBCO/SBCO can be used on that base address.
+
+   WARNING: Only immediate constant addresses are currently supported.  */
+static void
+pru_pragma_ctable_entry (cpp_reader * reader ATTRIBUTE_UNUSED)
+{
+  tree ctable_index, base_addr;
+  enum cpp_ttype type;
+
+  type = pragma_lex (&ctable_index);
+  if (type == CPP_NUMBER)
+    {
+      type = pragma_lex (&base_addr);
+      if (type == CPP_NUMBER)
+	{
+	  unsigned int i = tree_to_uhwi (ctable_index);
+	  unsigned HOST_WIDE_INT base = tree_to_uhwi (base_addr);
+
+	  type = pragma_lex (&base_addr);
+	  if (type != CPP_EOF)
+	    {
+	      error ("junk at end of %<#pragma CTABLE_ENTRY%>");
+	    }
+	  else if (i >= ARRAY_SIZE (pru_ctable))
+	    {
+	      error ("%<CTABLE_ENTRY%> index %d is not valid", i);
+	    }
+	  else if (pru_ctable[i].valid && pru_ctable[i].base != base)
+	    {
+	      error ("redefinition of %<CTABLE_ENTRY %d%>", i);
+	    }
+	  else
+	    {
+	      if (base & 0xff)
+		warning (0, "%<CTABLE_ENTRY%> base address is not "
+			    "a multiple of 256");
+	      pru_ctable[i].base = base;
+	      pru_ctable[i].valid = true;
+	    }
+	  return;
+	}
+    }
+  error ("malformed %<#pragma CTABLE_ENTRY%> variable address");
+}
+
+/* Implements REGISTER_TARGET_PRAGMAS.  */
+void
+pru_register_pragmas (void)
+{
+  c_register_pragma (NULL, "ctable_entry", pru_pragma_ctable_entry);
+  c_register_pragma (NULL, "CTABLE_ENTRY", pru_pragma_ctable_entry);
+}
diff --git a/gcc/config/pru/pru-protos.h b/gcc/config/pru/pru-protos.h
new file mode 100644
index 00000000000..73ab76e076c
--- /dev/null
+++ b/gcc/config/pru/pru-protos.h
@@ -0,0 +1,72 @@
+/* Subroutine declarations for TI PRU target support.
+   Copyright (C) 2014-2018 Free Software Foundation, Inc.
+   Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_PRU_PROTOS_H
+#define GCC_PRU_PROTOS_H
+
+struct pru_ctable_entry {
+    bool valid;
+    unsigned HOST_WIDE_INT base;
+};
+
+extern struct pru_ctable_entry pru_ctable[32];
+
+extern int pru_initial_elimination_offset (int, int);
+extern int pru_can_use_return_insn (void);
+extern void pru_expand_prologue (void);
+extern void pru_expand_epilogue (bool);
+extern void pru_function_profiler (FILE *, int);
+
+void pru_register_pragmas (void);
+
+#ifdef RTX_CODE
+extern rtx pru_get_return_address (int);
+extern int pru_hard_regno_rename_ok (unsigned int, unsigned int);
+
+extern const char * pru_output_sign_extend (rtx *);
+extern const char * pru_output_signed_cbranch (rtx *, bool);
+extern const char * pru_output_signed_cbranch_ubyteop2 (rtx *, bool);
+extern const char * pru_output_signed_cbranch_zeroop2 (rtx *, bool);
+
+extern rtx pru_expand_fp_compare (rtx comparison, machine_mode mode);
+
+extern void pru_emit_doloop (rtx *, int);
+
+extern bool pru_regno_ok_for_base_p (int, bool);
+
+static inline bool
+pru_regno_ok_for_index_p (int regno, bool strict_p)
+{
+  /* Selection logic is the same - PRU instructions are quite orthogonal.  */
+  return pru_regno_ok_for_base_p (regno, strict_p);
+}
+
+extern int pru_get_ctable_exact_base_index (unsigned HOST_WIDE_INT caddr);
+extern int pru_get_ctable_base_index (unsigned HOST_WIDE_INT caddr);
+extern int pru_get_ctable_base_offset (unsigned HOST_WIDE_INT caddr);
+
+extern void pru_register_abicheck_pass (void);
+#endif /* RTX_CODE */
+
+#ifdef TREE_CODE
+bool pru_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED);
+#endif /* TREE_CODE */
+
+#endif /* GCC_PRU_PROTOS_H */
diff --git a/gcc/config/pru/pru.c b/gcc/config/pru/pru.c
new file mode 100644
index 00000000000..63a8bbc8be3
--- /dev/null
+++ b/gcc/config/pru/pru.c
@@ -0,0 +1,2998 @@
+/* Target machine subroutines for TI PRU.
+   Copyright (C) 2014-2018 Free Software Foundation, Inc.
+   Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "target.h"
+#include "rtl.h"
+#include "tree.h"
+#include "stringpool.h"
+#include "attribs.h"
+#include "df.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "optabs.h"
+#include "regs.h"
+#include "emit-rtl.h"
+#include "recog.h"
+#include "diagnostic-core.h"
+#include "output.h"
+#include "insn-attr.h"
+#include "flags.h"
+#include "explow.h"
+#include "calls.h"
+#include "varasm.h"
+#include "expr.h"
+#include "toplev.h"
+#include "langhooks.h"
+#include "cfgrtl.h"
+#include "stor-layout.h"
+#include "dumpfile.h"
+#include "builtins.h"
+#include "pru-protos.h"
+
+/* This file should be included last.  */
+#include "target-def.h"
+
+#define INIT_ARRAY_ENTRY_BYTES	2
+
+/* Global PRU CTABLE entries, filled in by pragmas, and used for fast
+   addressing via LBCO/SBCO instructions.  */
+struct pru_ctable_entry pru_ctable[32];
+
+/* Forward function declarations.  */
+static bool prologue_saved_reg_p (int);
+static void pru_reorg_loop (rtx_insn *);
+
+struct GTY (()) machine_function
+{
+  /* Current frame information, to be filled in by pru_compute_frame_layout
+     with register save masks, and offsets for the current function.  */
+
+  /* Mask of registers to save.  */
+  HARD_REG_SET save_mask;
+  /* Number of bytes that the entire frame takes up.  */
+  int total_size;
+  /* Number of bytes that variables take up.  */
+  int var_size;
+  /* Number of bytes that outgoing arguments take up.  */
+  int args_size;
+  /* Number of bytes needed to store registers in frame.  */
+  int save_reg_size;
+  /* Offset from new stack pointer to store registers.  */
+  int save_regs_offset;
+  /* Offset from save_regs_offset to store frame pointer register.  */
+  int fp_save_offset;
+  /* != 0 if frame layout already calculated.  */
+  int initialized;
+  /* Number of doloop tags used so far.  */
+  int doloop_tags;
+  /* True if the last tag was allocated to a doloop_end.  */
+  bool doloop_tag_from_end;
+};
+
+/* Stack layout and calling conventions.  */
+
+#define PRU_STACK_ALIGN(LOC)  ROUND_UP((LOC), STACK_BOUNDARY / BITS_PER_UNIT)
+
+/* Return the bytes needed to compute the frame pointer from the current
+   stack pointer.  */
+static int
+pru_compute_frame_layout (void)
+{
+  int regno;
+  HARD_REG_SET *save_mask;
+  int total_size;
+  int var_size;
+  int out_args_size;
+  int save_reg_size;
+
+  if (cfun->machine->initialized)
+    return cfun->machine->total_size;
+
+  save_mask = &cfun->machine->save_mask;
+  CLEAR_HARD_REG_SET (*save_mask);
+
+  var_size = PRU_STACK_ALIGN ((HOST_WIDE_INT) get_frame_size ());
+  out_args_size = PRU_STACK_ALIGN ((HOST_WIDE_INT) crtl->outgoing_args_size);
+  total_size = var_size + out_args_size;
+
+  /* Calculate space needed for gp registers.  */
+  save_reg_size = 0;
+  for (regno = 0; regno <= LAST_GP_REG; regno++)
+    if (prologue_saved_reg_p (regno))
+      {
+	SET_HARD_REG_BIT (*save_mask, regno);
+	save_reg_size += 1;
+      }
+
+  cfun->machine->fp_save_offset = 0;
+  if (TEST_HARD_REG_BIT (*save_mask, HARD_FRAME_POINTER_REGNUM))
+    {
+      int fp_save_offset = 0;
+      for (regno = 0; regno < HARD_FRAME_POINTER_REGNUM; regno++)
+	if (TEST_HARD_REG_BIT (*save_mask, regno))
+	  fp_save_offset += 1;
+
+      cfun->machine->fp_save_offset = fp_save_offset;
+    }
+
+  save_reg_size = PRU_STACK_ALIGN (save_reg_size);
+  total_size += save_reg_size;
+  total_size += PRU_STACK_ALIGN (crtl->args.pretend_args_size);
+
+  /* Save other computed information.  */
+  cfun->machine->total_size = total_size;
+  cfun->machine->var_size = var_size;
+  cfun->machine->args_size = out_args_size;
+  cfun->machine->save_reg_size = save_reg_size;
+  cfun->machine->initialized = reload_completed;
+  cfun->machine->save_regs_offset = out_args_size + var_size;
+
+  return total_size;
+}
+
+/* Emit efficient RTL equivalent of ADD3 with the given const_int for
+   frame-related registers.
+     op0	  - Destination register.
+     op1	  - First addendum operand (a register).
+     addendum     - Second addendum operand (a constant).
+     kind	  - Note kind.  REG_NOTE_MAX if no note must be added.
+     reg_note_rtx - Reg note RTX.  NULL if it should be computed automatically.
+ */
+static rtx
+pru_add3_frame_adjust (rtx op0, rtx op1, int addendum,
+		       const enum reg_note kind, rtx reg_note_rtx)
+{
+  rtx insn;
+
+  rtx op0_adjust = gen_rtx_SET (op0, plus_constant (Pmode, op1, addendum));
+
+  if (UBYTE_INT (addendum) || UBYTE_INT (-addendum))
+    insn = emit_insn (op0_adjust);
+  else
+    {
+      /* Help the compiler to cope with an arbitrary integer constant.
+	 Reload has finished so we can't expect the compiler to
+	 auto-allocate a temporary register.  But we know that call-saved
+	 registers are not live yet, so we utilize them.  */
+      rtx tmpreg = gen_rtx_REG (Pmode, PROLOGUE_TEMP_REGNO);
+      if (addendum < 0)
+	{
+	  emit_insn (gen_rtx_SET (tmpreg, gen_int_mode (-addendum, Pmode)));
+	  insn = emit_insn (gen_sub3_insn (op0, op1, tmpreg));
+	}
+      else
+	{
+	  emit_insn (gen_rtx_SET (tmpreg, gen_int_mode (addendum, Pmode)));
+	  insn = emit_insn (gen_add3_insn (op0, op1, tmpreg));
+	}
+    }
+
+  /* Attach a note indicating what happened.  */
+  if (reg_note_rtx == NULL_RTX)
+    reg_note_rtx = copy_rtx (op0_adjust);
+  if (kind != REG_NOTE_MAX)
+    add_reg_note (insn, kind, reg_note_rtx);
+
+  RTX_FRAME_RELATED_P (insn) = 1;
+
+  return insn;
+}
+
+/* Add a const_int to the stack pointer register.  */
+static rtx
+pru_add_to_sp (int addendum, const enum reg_note kind)
+{
+  return pru_add3_frame_adjust (stack_pointer_rtx, stack_pointer_rtx,
+				addendum, kind, NULL_RTX);
+}
+
+/* Helper function used during prologue/epilogue.  Emits a single LBBO/SBBO
+   instruction for load/store of the next group of consecutive registers.  */
+static int
+xbbo_next_reg_cluster (int regno_start, int *sp_offset, bool do_store)
+{
+  int regno, nregs, i;
+  rtx addr;
+  rtx_insn *insn;
+
+  nregs = 0;
+
+  /* Skip the empty slots.  */
+  for (; regno_start <= LAST_GP_REG;)
+    if (TEST_HARD_REG_BIT (cfun->machine->save_mask, regno_start))
+      break;
+    else
+      regno_start++;
+
+  /* Find the largest consecutive group of registers to save.  */
+  for (regno = regno_start; regno <= LAST_GP_REG;)
+    if (TEST_HARD_REG_BIT (cfun->machine->save_mask, regno))
+      {
+	regno++;
+	nregs++;
+      }
+    else
+      break;
+
+  if (!nregs)
+    return -1;
+
+  gcc_assert (UBYTE_INT (*sp_offset));
+
+  /* Ok, save this bunch.  */
+  addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
+		       gen_int_mode (*sp_offset, Pmode));
+
+  if (do_store)
+    insn = targetm.gen_store_multiple (gen_frame_mem (BLKmode, addr),
+				       gen_rtx_REG (QImode, regno_start),
+				       GEN_INT (nregs));
+  else
+    insn = targetm.gen_load_multiple (gen_rtx_REG (QImode, regno_start),
+				      gen_frame_mem (BLKmode, addr),
+				      GEN_INT (nregs));
+
+  gcc_assert (reload_completed);
+  gcc_assert (insn);
+  emit_insn (insn);
+
+  /* Tag as frame-related.  */
+  RTX_FRAME_RELATED_P (insn) = 1;
+
+  if (!do_store)
+    {
+      /* Tag epilogue unwind notes.  */
+      for (i = regno_start; i < (regno_start + nregs); i++)
+	add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (QImode, i));
+    }
+
+  /* Increment and save offset in anticipation of the next register group.  */
+  *sp_offset += nregs * UNITS_PER_WORD;
+
+  return regno_start + nregs;
+}
+
+/* Emit function prologue.  */
+void
+pru_expand_prologue (void)
+{
+  int regno_start;
+  int total_frame_size;
+  int sp_offset;      /* Offset from base_reg to final stack value.  */
+  int save_regs_base; /* Offset from base_reg to register save area.  */
+  int save_offset;    /* Temporary offset to currently saved register group.  */
+  rtx insn;
+
+  total_frame_size = pru_compute_frame_layout ();
+
+  if (flag_stack_usage_info)
+    current_function_static_stack_size = total_frame_size;
+
+  /* Decrement the stack pointer.  */
+  if (!UBYTE_INT (total_frame_size))
+    {
+      /* We need an intermediary point, this will point at the spill block.  */
+      insn = pru_add_to_sp (cfun->machine->save_regs_offset
+			     - total_frame_size,
+			     REG_NOTE_MAX);
+      save_regs_base = 0;
+      sp_offset = -cfun->machine->save_regs_offset;
+    }
+  else if (total_frame_size)
+    {
+      insn = emit_insn (gen_sub2_insn (stack_pointer_rtx,
+				       gen_int_mode (total_frame_size,
+						     Pmode)));
+      RTX_FRAME_RELATED_P (insn) = 1;
+      save_regs_base = cfun->machine->save_regs_offset;
+      sp_offset = 0;
+    }
+  else
+    save_regs_base = sp_offset = 0;
+
+  regno_start = 0;
+  save_offset = save_regs_base;
+  do {
+      regno_start = xbbo_next_reg_cluster (regno_start, &save_offset, true);
+  } while (regno_start >= 0);
+
+  if (frame_pointer_needed)
+    {
+      int fp_save_offset = save_regs_base + cfun->machine->fp_save_offset;
+      pru_add3_frame_adjust (hard_frame_pointer_rtx,
+				    stack_pointer_rtx,
+				    fp_save_offset,
+				    REG_NOTE_MAX,
+				    NULL_RTX);
+    }
+
+  if (sp_offset)
+      pru_add_to_sp (sp_offset, REG_FRAME_RELATED_EXPR);
+
+  /* If we are profiling, make sure no instructions are scheduled before
+     the call to mcount.  */
+  if (crtl->profile)
+    emit_insn (gen_blockage ());
+}
+
+/* Emit function epilogue.  */
+void
+pru_expand_epilogue (bool sibcall_p)
+{
+  rtx cfa_adj;
+  int total_frame_size;
+  int sp_adjust, save_offset;
+  int regno_start;
+
+  if (!sibcall_p && pru_can_use_return_insn ())
+    {
+      emit_jump_insn (gen_return ());
+      return;
+    }
+
+  emit_insn (gen_blockage ());
+
+  total_frame_size = pru_compute_frame_layout ();
+  if (frame_pointer_needed)
+    {
+      /* Recover the stack pointer.  */
+      cfa_adj = plus_constant (Pmode, stack_pointer_rtx,
+			       (total_frame_size
+				- cfun->machine->save_regs_offset));
+      pru_add3_frame_adjust (stack_pointer_rtx,
+			     hard_frame_pointer_rtx,
+			     -cfun->machine->fp_save_offset,
+			     REG_CFA_DEF_CFA,
+			     cfa_adj);
+
+      save_offset = 0;
+      sp_adjust = total_frame_size - cfun->machine->save_regs_offset;
+    }
+  else if (!UBYTE_INT (total_frame_size))
+    {
+      pru_add_to_sp (cfun->machine->save_regs_offset,
+			    REG_CFA_ADJUST_CFA);
+      save_offset = 0;
+      sp_adjust = total_frame_size - cfun->machine->save_regs_offset;
+    }
+  else
+    {
+      save_offset = cfun->machine->save_regs_offset;
+      sp_adjust = total_frame_size;
+    }
+
+  regno_start = 0;
+  do {
+      regno_start = xbbo_next_reg_cluster (regno_start, &save_offset, false);
+  } while (regno_start >= 0);
+
+  if (sp_adjust)
+      pru_add_to_sp (sp_adjust, REG_CFA_ADJUST_CFA);
+
+  if (!sibcall_p)
+    emit_jump_insn (gen_simple_return ());
+}
+
+/* Implement RETURN_ADDR_RTX.  Note, we do not support moving
+   back to a previous frame.  */
+rtx
+pru_get_return_address (int count)
+{
+  if (count != 0)
+    return NULL_RTX;
+
+  /* Return r3.w2.  */
+  return get_hard_reg_initial_val (HImode, RA_REGNO);
+}
+
+/* Implement FUNCTION_PROFILER macro.  */
+void
+pru_function_profiler (FILE *file, int labelno ATTRIBUTE_UNUSED)
+{
+  fprintf (file, "\tmov\tr1, ra\n");
+  fprintf (file, "\tcall\t_mcount\n");
+  fprintf (file, "\tmov\tra, r1\n");
+}
+
+/* Dump stack layout.  */
+static void
+pru_dump_frame_layout (FILE *file)
+{
+  fprintf (file, "\t%s Current Frame Info\n", ASM_COMMENT_START);
+  fprintf (file, "\t%s total_size = %d\n", ASM_COMMENT_START,
+	   cfun->machine->total_size);
+  fprintf (file, "\t%s var_size = %d\n", ASM_COMMENT_START,
+	   cfun->machine->var_size);
+  fprintf (file, "\t%s args_size = %d\n", ASM_COMMENT_START,
+	   cfun->machine->args_size);
+  fprintf (file, "\t%s save_reg_size = %d\n", ASM_COMMENT_START,
+	   cfun->machine->save_reg_size);
+  fprintf (file, "\t%s initialized = %d\n", ASM_COMMENT_START,
+	   cfun->machine->initialized);
+  fprintf (file, "\t%s save_regs_offset = %d\n", ASM_COMMENT_START,
+	   cfun->machine->save_regs_offset);
+  fprintf (file, "\t%s is_leaf = %d\n", ASM_COMMENT_START,
+	   crtl->is_leaf);
+  fprintf (file, "\t%s frame_pointer_needed = %d\n", ASM_COMMENT_START,
+	   frame_pointer_needed);
+  fprintf (file, "\t%s pretend_args_size = %d\n", ASM_COMMENT_START,
+	   crtl->args.pretend_args_size);
+}
+
+/* Return true if REGNO should be saved in the prologue.  */
+static bool
+prologue_saved_reg_p (int regno)
+{
+  gcc_assert (GP_REG_P (regno));
+
+  if (df_regs_ever_live_p (regno) && !call_used_regs[regno])
+    return true;
+
+  /* 32-bit FP.  */
+  if (frame_pointer_needed
+      && regno >= HARD_FRAME_POINTER_REGNUM
+      && regno < HARD_FRAME_POINTER_REGNUM + GET_MODE_SIZE (Pmode))
+    return true;
+
+  /* 16-bit RA.  */
+  if (regno == RA_REGNO && df_regs_ever_live_p (RA_REGNO))
+    return true;
+  if (regno == RA_REGNO + 1 && df_regs_ever_live_p (RA_REGNO + 1))
+    return true;
+
+  return false;
+}
+
+/* Implement TARGET_CAN_ELIMINATE.  */
+static bool
+pru_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
+{
+  if (to == STACK_POINTER_REGNUM)
+    return !frame_pointer_needed;
+  return true;
+}
+
+/* Implement INITIAL_ELIMINATION_OFFSET macro.  */
+int
+pru_initial_elimination_offset (int from, int to)
+{
+  int offset;
+
+  pru_compute_frame_layout ();
+
+  /* Set OFFSET to the offset from the stack pointer.  */
+  switch (from)
+    {
+    case FRAME_POINTER_REGNUM:
+      offset = cfun->machine->args_size;
+      break;
+
+    case ARG_POINTER_REGNUM:
+      offset = cfun->machine->total_size;
+      offset -= crtl->args.pretend_args_size;
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+
+  /* If we are asked for the frame pointer offset, then adjust OFFSET
+     by the offset from the frame pointer to the stack pointer.  */
+  if (to == HARD_FRAME_POINTER_REGNUM)
+    offset -= (cfun->machine->save_regs_offset
+	       + cfun->machine->fp_save_offset);
+
+  return offset;
+}
+
+/* Return nonzero if this function is known to have a null epilogue.
+   This allows the optimizer to omit jumps to jumps if no stack
+   was created.  */
+int
+pru_can_use_return_insn (void)
+{
+  if (!reload_completed || crtl->profile)
+    return 0;
+
+  return pru_compute_frame_layout () == 0;
+}
+
+/* Implement TARGET_MODES_TIEABLE_P.  */
+
+static bool
+pru_modes_tieable_p (machine_mode mode1, machine_mode mode2)
+{
+  return (mode1 == mode2
+	  || (GET_MODE_SIZE (mode1) <= 4 && GET_MODE_SIZE (mode2) <= 4));
+}
+
+/* Implement TARGET_HARD_REGNO_MODE_OK.  */
+
+static bool
+pru_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
+{
+  switch (GET_MODE_SIZE (mode))
+    {
+    case 1: return true;
+    case 2: return (regno % 4) <= 2;
+    case 4: return (regno % 4) == 0;
+    default: return (regno % 4) == 0; /* Not sure why VOIDmode is passed.  */
+    }
+}
+
+/* Implement `TARGET_HARD_REGNO_SCRATCH_OK'.
+   Returns true if REGNO is safe to be allocated as a scratch
+   register (for a define_peephole2) in the current function.  */
+
+static bool
+pru_hard_regno_scratch_ok (unsigned int regno)
+{
+  /* Don't allow hard registers that might be part of the frame pointer.
+     Some places in the compiler just test for [HARD_]FRAME_POINTER_REGNUM
+     and don't handle a frame pointer that spans more than one register.  */
+
+  if ((!reload_completed || frame_pointer_needed)
+      && ((regno >= HARD_FRAME_POINTER_REGNUM
+	   && regno <= HARD_FRAME_POINTER_REGNUM + 3)
+	  || (regno >= FRAME_POINTER_REGNUM
+	      && regno <= FRAME_POINTER_REGNUM + 3)))
+    {
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Worker function for `HARD_REGNO_RENAME_OK'.
+   Return nonzero if register OLD_REG can be renamed to register NEW_REG.  */
+
+int
+pru_hard_regno_rename_ok (unsigned int old_reg,
+			  unsigned int new_reg)
+{
+  /* Don't allow hard registers that might be part of the frame pointer.
+     Some places in the compiler just test for [HARD_]FRAME_POINTER_REGNUM
+     and don't care for a frame pointer that spans more than one register.  */
+  if ((!reload_completed || frame_pointer_needed)
+      && ((old_reg >= HARD_FRAME_POINTER_REGNUM
+	   && old_reg <= HARD_FRAME_POINTER_REGNUM + 3)
+	  || (old_reg >= FRAME_POINTER_REGNUM
+	      && old_reg <= FRAME_POINTER_REGNUM + 3)
+	  || (new_reg >= HARD_FRAME_POINTER_REGNUM
+	      && new_reg <= HARD_FRAME_POINTER_REGNUM + 3)
+	  || (new_reg >= FRAME_POINTER_REGNUM
+	      && new_reg <= FRAME_POINTER_REGNUM + 3)))
+    {
+      return 0;
+    }
+
+  return 1;
+}
+
+/* Allocate a chunk of memory for per-function machine-dependent data.  */
+static struct machine_function *
+pru_init_machine_status (void)
+{
+  return ggc_cleared_alloc<machine_function> ();
+}
+
+/* Implement TARGET_OPTION_OVERRIDE.  */
+static void
+pru_option_override (void)
+{
+#ifdef SUBTARGET_OVERRIDE_OPTIONS
+  SUBTARGET_OVERRIDE_OPTIONS;
+#endif
+
+  /* Check for unsupported options.  */
+  if (flag_pic == 1)
+    warning (OPT_fpic, "%<-fpic%> is not supported");
+  if (flag_pic == 2)
+    warning (OPT_fPIC, "%<-fPIC%> is not supported");
+  if (flag_pie == 1)
+    warning (OPT_fpie, "%<-fpie%> is not supported");
+  if (flag_pie == 2)
+    warning (OPT_fPIE, "%<-fPIE%> is not supported");
+
+  /* QBxx conditional branching cannot cope with block reordering.  */
+  if (flag_reorder_blocks_and_partition)
+    {
+      inform (input_location, "%<-freorder-blocks-and-partition%> "
+			      "not supported on this architecture");
+      flag_reorder_blocks_and_partition = 0;
+      flag_reorder_blocks = 1;
+    }
+
+  /* Function to allocate machine-dependent function status.  */
+  init_machine_status = &pru_init_machine_status;
+
+  /* Save the initial options in case the user does function specific
+     options.  */
+  target_option_default_node = target_option_current_node
+    = build_target_option_node (&global_options);
+
+  /* Due to difficulties in implementing the TI ABI with GCC,
+     at least check and error-out if GCC cannot compile a
+     compliant output.  */
+  pru_register_abicheck_pass ();
+}
+
+/* Compute a (partial) cost for rtx X.  Return true if the complete
+   cost has been computed, and false if subexpressions should be
+   scanned.  In either case, *TOTAL contains the cost result.  */
+static bool
+pru_rtx_costs (rtx x, machine_mode mode ATTRIBUTE_UNUSED,
+	       int outer_code, int opno ATTRIBUTE_UNUSED,
+	       int *total, bool speed ATTRIBUTE_UNUSED)
+{
+  const int code = GET_CODE (x);
+
+  switch (code)
+    {
+      case CONST_INT:
+	if (UBYTE_INT (INTVAL (x)))
+	  {
+	    *total = COSTS_N_INSNS (0);
+	    return true;
+	  }
+	else if (outer_code == MEM && ctable_addr_operand (x, VOIDmode))
+	  {
+	    *total = COSTS_N_INSNS (0);
+	    return true;
+	  }
+	else if (UHWORD_INT (INTVAL (x)))
+	  {
+	    *total = COSTS_N_INSNS (1);
+	    return true;
+	  }
+	else
+	  {
+	    *total = COSTS_N_INSNS (2);
+	    return true;
+	  }
+
+      case LABEL_REF:
+      case SYMBOL_REF:
+      case CONST:
+      case CONST_DOUBLE:
+	  {
+	    *total = COSTS_N_INSNS (1);
+	    return true;
+	  }
+    case SET:
+	{
+	  /* A SET doesn't have a mode, so let's look at the SET_DEST to get
+	     the mode for the factor.  */
+	  mode = GET_MODE (SET_DEST (x));
+
+	  if (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (SImode)
+	      && (GET_CODE (SET_SRC (x)) == ZERO_EXTEND
+		  || outer_code == ZERO_EXTEND))
+	    {
+	      *total = 0;
+	    }
+	  else
+	    {
+	      /* SI move has the same cost as a QI move.  */
+	      int factor = GET_MODE_SIZE (mode) / GET_MODE_SIZE (SImode);
+	      if (factor == 0)
+		factor = 1;
+	      *total = factor * COSTS_N_INSNS (1);
+	    }
+
+	  return false;
+	}
+
+      case MULT:
+	{
+	  *total = COSTS_N_INSNS (8);
+	  return false;
+	}
+      case PLUS:
+	{
+	  rtx op0 = XEXP (x, 0);
+	  rtx op1 = XEXP (x, 1);
+	  if (outer_code == MEM
+	      && ((REG_P (op0) && reg_or_ubyte_operand (op1, VOIDmode))
+		  || (REG_P (op1) && reg_or_ubyte_operand (op0, VOIDmode))
+		  || (ctable_addr_operand (op0, VOIDmode) && op1 == NULL_RTX)
+		  || (ctable_addr_operand (op1, VOIDmode) && op0 == NULL_RTX)
+		  || (ctable_base_operand (op0, VOIDmode) && REG_P (op1))
+		  || (ctable_base_operand (op1, VOIDmode) && REG_P (op0))))
+	    {
+	      /* CTABLE or REG base addressing - PLUS comes for free.  */
+	      *total = COSTS_N_INSNS (0);
+	      return true;
+	    }
+	  else
+	    {
+	      *total = COSTS_N_INSNS (1);
+	      return false;
+	    }
+	}
+      case SIGN_EXTEND:
+	{
+	  *total = COSTS_N_INSNS (3);
+	  return false;
+	}
+      case ASHIFTRT:
+	{
+	  rtx op1 = XEXP (x, 1);
+	  if (const_1_operand (op1, VOIDmode))
+	    *total = COSTS_N_INSNS (2);
+	  else
+	    *total = COSTS_N_INSNS (6);
+	  return false;
+	}
+      case ZERO_EXTRACT:
+	{
+	  rtx op2 = XEXP (x, 2);
+	  if ((outer_code == EQ || outer_code == NE)
+	      && CONST_INT_P (op2)
+	      && INTVAL (op2) == 1)
+	    {
+	      /* Branch if bit is set/clear is a single instruction.  */
+	      *total = COSTS_N_INSNS (0);
+	      return true;
+	    }
+	  else
+	    {
+	      *total = COSTS_N_INSNS (2);
+	      return false;
+	    }
+	}
+
+      case ZERO_EXTEND:
+	{
+	  *total = COSTS_N_INSNS (0);
+	  return false;
+	}
+
+      default:
+	{
+	  /* Do not factor mode size in the cost.  */
+	  *total = COSTS_N_INSNS (1);
+	  return false;
+	}
+    }
+}
+
+/* Implement TARGET_PREFERRED_RELOAD_CLASS.  */
+static reg_class_t
+pru_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, reg_class_t regclass)
+{
+  return regclass == NO_REGS ? GENERAL_REGS : regclass;
+}
+
+static GTY(()) rtx eqdf_libfunc;
+static GTY(()) rtx nedf_libfunc;
+static GTY(()) rtx ledf_libfunc;
+static GTY(()) rtx ltdf_libfunc;
+static GTY(()) rtx gedf_libfunc;
+static GTY(()) rtx gtdf_libfunc;
+static GTY(()) rtx eqsf_libfunc;
+static GTY(()) rtx nesf_libfunc;
+static GTY(()) rtx lesf_libfunc;
+static GTY(()) rtx ltsf_libfunc;
+static GTY(()) rtx gesf_libfunc;
+static GTY(()) rtx gtsf_libfunc;
+
+/* Implement the TARGET_INIT_LIBFUNCS macro.  We use this to rename library
+   functions to match the PRU ABI.  */
+
+static void
+pru_init_libfuncs (void)
+{
+  /* Double-precision floating-point arithmetic.  */
+  set_optab_libfunc (add_optab, DFmode, "__pruabi_addd");
+  set_optab_libfunc (sdiv_optab, DFmode, "__pruabi_divd");
+  set_optab_libfunc (smul_optab, DFmode, "__pruabi_mpyd");
+  set_optab_libfunc (neg_optab, DFmode, "__pruabi_negd");
+  set_optab_libfunc (sub_optab, DFmode, "__pruabi_subd");
+
+  /* Single-precision floating-point arithmetic.  */
+  set_optab_libfunc (add_optab, SFmode, "__pruabi_addf");
+  set_optab_libfunc (sdiv_optab, SFmode, "__pruabi_divf");
+  set_optab_libfunc (smul_optab, SFmode, "__pruabi_mpyf");
+  set_optab_libfunc (neg_optab, SFmode, "__pruabi_negf");
+  set_optab_libfunc (sub_optab, SFmode, "__pruabi_subf");
+
+  /* Floating-point comparisons.  */
+  eqsf_libfunc = init_one_libfunc ("__pruabi_eqf");
+  nesf_libfunc = init_one_libfunc ("__pruabi_neqf");
+  lesf_libfunc = init_one_libfunc ("__pruabi_lef");
+  ltsf_libfunc = init_one_libfunc ("__pruabi_ltf");
+  gesf_libfunc = init_one_libfunc ("__pruabi_gef");
+  gtsf_libfunc = init_one_libfunc ("__pruabi_gtf");
+  eqdf_libfunc = init_one_libfunc ("__pruabi_eqd");
+  nedf_libfunc = init_one_libfunc ("__pruabi_neqd");
+  ledf_libfunc = init_one_libfunc ("__pruabi_led");
+  ltdf_libfunc = init_one_libfunc ("__pruabi_ltd");
+  gedf_libfunc = init_one_libfunc ("__pruabi_ged");
+  gtdf_libfunc = init_one_libfunc ("__pruabi_gtd");
+
+  set_optab_libfunc (eq_optab, SFmode, NULL);
+  set_optab_libfunc (ne_optab, SFmode, "__pruabi_neqf");
+  set_optab_libfunc (gt_optab, SFmode, NULL);
+  set_optab_libfunc (ge_optab, SFmode, NULL);
+  set_optab_libfunc (lt_optab, SFmode, NULL);
+  set_optab_libfunc (le_optab, SFmode, NULL);
+  set_optab_libfunc (unord_optab, SFmode, "__pruabi_unordf");
+  set_optab_libfunc (eq_optab, DFmode, NULL);
+  set_optab_libfunc (ne_optab, DFmode, "__pruabi_neqd");
+  set_optab_libfunc (gt_optab, DFmode, NULL);
+  set_optab_libfunc (ge_optab, DFmode, NULL);
+  set_optab_libfunc (lt_optab, DFmode, NULL);
+  set_optab_libfunc (le_optab, DFmode, NULL);
+  set_optab_libfunc (unord_optab, DFmode, "__pruabi_unordd");
+
+  /* Floating-point to integer conversions.  */
+  set_conv_libfunc (sfix_optab, SImode, DFmode, "__pruabi_fixdi");
+  set_conv_libfunc (ufix_optab, SImode, DFmode, "__pruabi_fixdu");
+  set_conv_libfunc (sfix_optab, DImode, DFmode, "__pruabi_fixdlli");
+  set_conv_libfunc (ufix_optab, DImode, DFmode, "__pruabi_fixdull");
+  set_conv_libfunc (sfix_optab, SImode, SFmode, "__pruabi_fixfi");
+  set_conv_libfunc (ufix_optab, SImode, SFmode, "__pruabi_fixfu");
+  set_conv_libfunc (sfix_optab, DImode, SFmode, "__pruabi_fixflli");
+  set_conv_libfunc (ufix_optab, DImode, SFmode, "__pruabi_fixfull");
+
+  /* Conversions between floating types.  */
+  set_conv_libfunc (trunc_optab, SFmode, DFmode, "__pruabi_cvtdf");
+  set_conv_libfunc (sext_optab, DFmode, SFmode, "__pruabi_cvtfd");
+
+  /* Integer to floating-point conversions.  */
+  set_conv_libfunc (sfloat_optab, DFmode, SImode, "__pruabi_fltid");
+  set_conv_libfunc (ufloat_optab, DFmode, SImode, "__pruabi_fltud");
+  set_conv_libfunc (sfloat_optab, DFmode, DImode, "__pruabi_fltllid");
+  set_conv_libfunc (ufloat_optab, DFmode, DImode, "__pruabi_fltulld");
+  set_conv_libfunc (sfloat_optab, SFmode, SImode, "__pruabi_fltif");
+  set_conv_libfunc (ufloat_optab, SFmode, SImode, "__pruabi_fltuf");
+  set_conv_libfunc (sfloat_optab, SFmode, DImode, "__pruabi_fltllif");
+  set_conv_libfunc (ufloat_optab, SFmode, DImode, "__pruabi_fltullf");
+
+  /* Long long.  */
+  set_optab_libfunc (ashr_optab, DImode, "__pruabi_asrll");
+  set_optab_libfunc (smul_optab, DImode, "__pruabi_mpyll");
+  set_optab_libfunc (ashl_optab, DImode, "__pruabi_lslll");
+  set_optab_libfunc (lshr_optab, DImode, "__pruabi_lsrll");
+
+  set_optab_libfunc (sdiv_optab, SImode, "__pruabi_divi");
+  set_optab_libfunc (udiv_optab, SImode, "__pruabi_divu");
+  set_optab_libfunc (smod_optab, SImode, "__pruabi_remi");
+  set_optab_libfunc (umod_optab, SImode, "__pruabi_remu");
+  set_optab_libfunc (sdivmod_optab, SImode, "__pruabi_divremi");
+  set_optab_libfunc (udivmod_optab, SImode, "__pruabi_divremu");
+  set_optab_libfunc (sdiv_optab, DImode, "__pruabi_divlli");
+  set_optab_libfunc (udiv_optab, DImode, "__pruabi_divull");
+  set_optab_libfunc (smod_optab, DImode, "__pruabi_remlli");
+  set_optab_libfunc (umod_optab, DImode, "__pruabi_remull");
+  set_optab_libfunc (udivmod_optab, DImode, "__pruabi_divremull");
+}
+
+
+/* Emit comparison instruction if necessary, returning the expression
+   that holds the compare result in the proper mode.  Return the comparison
+   that should be used in the jump insn.  */
+
+rtx
+pru_expand_fp_compare (rtx comparison, machine_mode mode)
+{
+  enum rtx_code code = GET_CODE (comparison);
+  rtx op0 = XEXP (comparison, 0);
+  rtx op1 = XEXP (comparison, 1);
+  rtx cmp;
+  enum rtx_code jump_code = code;
+  machine_mode op_mode = GET_MODE (op0);
+  rtx_insn *insns;
+  rtx libfunc;
+
+  gcc_assert (op_mode == DFmode || op_mode == SFmode);
+
+  if (code == UNGE)
+    {
+      code = LT;
+      jump_code = EQ;
+    }
+  else if (code == UNLE)
+    {
+      code = GT;
+      jump_code = EQ;
+    }
+  else
+    jump_code = NE;
+
+  switch (code)
+    {
+    case EQ:
+      libfunc = op_mode == DFmode ? eqdf_libfunc : eqsf_libfunc;
+      break;
+    case NE:
+      libfunc = op_mode == DFmode ? nedf_libfunc : nesf_libfunc;
+      break;
+    case GT:
+      libfunc = op_mode == DFmode ? gtdf_libfunc : gtsf_libfunc;
+      break;
+    case GE:
+      libfunc = op_mode == DFmode ? gedf_libfunc : gesf_libfunc;
+      break;
+    case LT:
+      libfunc = op_mode == DFmode ? ltdf_libfunc : ltsf_libfunc;
+      break;
+    case LE:
+      libfunc = op_mode == DFmode ? ledf_libfunc : lesf_libfunc;
+      break;
+    default:
+      gcc_unreachable ();
+    }
+  start_sequence ();
+
+  cmp = emit_library_call_value (libfunc, 0, LCT_CONST, SImode,
+				 op0, op_mode, op1, op_mode);
+  insns = get_insns ();
+  end_sequence ();
+
+  emit_libcall_block (insns, cmp, cmp,
+		      gen_rtx_fmt_ee (code, SImode, op0, op1));
+
+  return gen_rtx_fmt_ee (jump_code, mode, cmp, const0_rtx);
+}
+
+/* Return the sign bit position for given OP's mode.  */
+static int
+sign_bit_position (const rtx op)
+{
+  const int sz = GET_MODE_SIZE (GET_MODE (op));
+
+  return  sz * 8 - 1;
+}
+
+/* Output asm code for sign_extend operation.  */
+const char *
+pru_output_sign_extend (rtx *operands)
+{
+  static char buf[512];
+  int bufi;
+  const int dst_sz = GET_MODE_SIZE (GET_MODE (operands[0]));
+  const int src_sz = GET_MODE_SIZE (GET_MODE (operands[1]));
+  char ext_start;
+
+  switch (src_sz)
+    {
+    case 1: ext_start = 'y'; break;
+    case 2: ext_start = 'z'; break;
+    default: gcc_unreachable ();
+    }
+
+  gcc_assert (dst_sz > src_sz);
+
+  /* Note that src and dst can be different parts of the same
+     register, e.g. "r7, r7.w1".  */
+  bufi = snprintf (buf, sizeof (buf),
+	  "mov\t%%0, %%1\n\t"		      /* Copy AND make positive.  */
+	  "qbbc\t.+8, %%0, %d\n\t"	      /* Check sign bit.  */
+	  "fill\t%%%c0, %d",		      /* Make negative.  */
+	  sign_bit_position (operands[1]),
+	  ext_start,
+	  dst_sz - src_sz);
+
+  gcc_assert (bufi > 0);
+  gcc_assert ((unsigned int)bufi < sizeof (buf));
+
+  return buf;
+}
+
+/* Branches and compares.  */
+
+/* PRU's ALU does not support signed comparison operations.  That's why we
+   emulate them.  By first checking the sign bit and handling every possible
+   operand sign combination, we can simulate signed comparisons in just
+   5 instructions.  See table below.
+
+.-------------------.---------------------------------------------------.
+| Operand sign bit  | Mapping the signed comparison to an unsigned one  |
+|---------+---------+------------+------------+------------+------------|
+| OP1.b31 | OP2.b31 | OP1 < OP2  | OP1 <= OP2 | OP1 > OP2  | OP1 >= OP2 |
+|---------+---------+------------+------------+------------+------------|
+| 0       | 0       | OP1 < OP2  | OP1 <= OP2 | OP1 > OP2  | OP1 >= OP2 |
+|---------+---------+------------+------------+------------+------------|
+| 0       | 1       | false      | false      | true       | true       |
+|---------+---------+------------+------------+------------+------------|
+| 1       | 0       | true       | true       | false      | false      |
+|---------+---------+------------+------------+------------+------------|
+| 1       | 1       | OP1 < OP2  | OP1 <= OP2 | OP1 > OP2  | OP1 >= OP2 |
+`---------'---------'------------'------------'------------+------------'
+
+
+Given the table above, here is an example for a concrete op:
+  LT:
+		    qbbc OP1_POS, OP1, 31
+  OP1_NEG:	    qbbc BRANCH_TAKEN_LABEL, OP2, 31
+  OP1_NEG_OP2_NEG:  qblt BRANCH_TAKEN_LABEL, OP2, OP1
+		    ; jmp OUT -> can be eliminated because we'll take the
+		    ; following branch.  OP2.b31 is guaranteed to be 1
+		    ; by the time we get here.
+  OP1_POS:	    qbbs OUT, OP2, 31
+  OP1_POS_OP2_POS:  qblt BRANCH_TAKEN_LABEL, OP2, OP1
+#if FAR_JUMP
+		    jmp OUT
+BRANCH_TAKEN_LABEL: jmp REAL_BRANCH_TAKEN_LABEL
+#endif
+  OUT:
+
+*/
+
+/* Output asm code for a signed-compare LT/LE conditional branch.  */
+static const char *
+pru_output_ltle_signed_cbranch (rtx *operands, bool is_near)
+{
+  static char buf[1024];
+  enum rtx_code code = GET_CODE (operands[0]);
+  rtx op1;
+  rtx op2;
+  const char *cmp_opstr;
+  int bufi = 0;
+
+  op1 = operands[1];
+  op2 = operands[2];
+
+  gcc_assert (GET_CODE (op1) == REG && GET_CODE (op2) == REG);
+
+  /* Determine the comparison operators for positive and negative operands.  */
+  if (code == LT)
+      cmp_opstr = "qblt";
+  else if (code == LE)
+      cmp_opstr = "qble";
+  else
+      gcc_unreachable ();
+
+  if (is_near)
+    {
+      bufi = snprintf (buf, sizeof (buf),
+		       "qbbc\t.+12, %%1, %d\n\t"
+		       "qbbc\t%%l3, %%2, %d\n\t"  /* OP1_NEG.  */
+		       "%s\t%%l3, %%2, %%1\n\t"   /* OP1_NEG_OP2_NEG.  */
+		       "qbbs\t.+8, %%2, %d\n\t"   /* OP1_POS.  */
+		       "%s\t%%l3, %%2, %%1",	  /* OP1_POS_OP2_POS.  */
+		       sign_bit_position (op1),
+		       sign_bit_position (op2),
+		       cmp_opstr,
+		       sign_bit_position (op2),
+		       cmp_opstr);
+    }
+  else
+    {
+      bufi = snprintf (buf, sizeof (buf),
+		       "qbbc\t.+12, %%1, %d\n\t"
+		       "qbbc\t.+20, %%2, %d\n\t"  /* OP1_NEG.  */
+		       "%s\t.+16, %%2, %%1\n\t"   /* OP1_NEG_OP2_NEG.  */
+		       "qbbs\t.+16, %%2, %d\n\t"  /* OP1_POS.  */
+		       "%s\t.+8, %%2, %%1\n\t"    /* OP1_POS_OP2_POS.  */
+		       "jmp\t.+8\n\t"		  /* jmp OUT.  */
+		       "jmp\t%%%%label(%%l3)",	  /* BRANCH_TAKEN_LABEL.  */
+		       sign_bit_position (op1),
+		       sign_bit_position (op2),
+		       cmp_opstr,
+		       sign_bit_position (op2),
+		       cmp_opstr);
+    }
+
+  gcc_assert (bufi > 0);
+  gcc_assert ((unsigned int)bufi < sizeof (buf));
+
+  return buf;
+}
+
+/* Output asm code for a signed-compare GT/GE conditional branch.  */
+static const char *
+pru_output_gtge_signed_cbranch (rtx *operands, bool is_near)
+{
+  static char buf[1024];
+  enum rtx_code code = GET_CODE (operands[0]);
+  rtx op1;
+  rtx op2;
+  const char *cmp_opstr;
+  int bufi = 0;
+
+  op1 = operands[1];
+  op2 = operands[2];
+
+  gcc_assert (GET_CODE (op1) == REG && GET_CODE (op2) == REG);
+
+  /* Determine the comparison operators for positive and negative operands.  */
+  if (code == GT)
+      cmp_opstr = "qbgt";
+  else if (code == GE)
+      cmp_opstr = "qbge";
+  else
+    gcc_unreachable ();
+
+  if (is_near)
+    {
+      bufi = snprintf (buf, sizeof (buf),
+		       "qbbs\t.+12, %%1, %d\n\t"
+		       "qbbs\t%%l3, %%2, %d\n\t"  /* OP1_POS.  */
+		       "%s\t%%l3, %%2, %%1\n\t"   /* OP1_POS_OP2_POS.  */
+		       "qbbc\t.+8, %%2, %d\n\t"   /* OP1_NEG.  */
+		       "%s\t%%l3, %%2, %%1",      /* OP1_NEG_OP2_NEG.  */
+		       sign_bit_position (op1),
+		       sign_bit_position (op2),
+		       cmp_opstr,
+		       sign_bit_position (op2),
+		       cmp_opstr);
+    }
+  else
+    {
+      bufi = snprintf (buf, sizeof (buf),
+		       "qbbs\t.+12, %%1, %d\n\t"
+		       "qbbs\t.+20, %%2, %d\n\t"  /* OP1_POS.  */
+		       "%s\t.+16, %%2, %%1\n\t"   /* OP1_POS_OP2_POS.  */
+		       "qbbc\t.+16, %%2, %d\n\t"  /* OP1_NEG.  */
+		       "%s\t.+8, %%2, %%1\n\t"    /* OP1_NEG_OP2_NEG.  */
+		       "jmp\t.+8\n\t"		  /* jmp OUT.  */
+		       "jmp\t%%%%label(%%l3)",	  /* BRANCH_TAKEN_LABEL.  */
+		       sign_bit_position (op1),
+		       sign_bit_position (op2),
+		       cmp_opstr,
+		       sign_bit_position (op2),
+		       cmp_opstr);
+    }
+
+  gcc_assert (bufi > 0);
+  gcc_assert ((unsigned int)bufi < sizeof (buf));
+
+  return buf;
+}
+
+/* Output asm code for a signed-compare conditional branch.
+
+   If IS_NEAR is true, then QBBx instructions may be used for reaching
+   the destination label.  Otherwise JMP is used, at the expense of
+   increased code size.  */
+const char *
+pru_output_signed_cbranch (rtx *operands, bool is_near)
+{
+  enum rtx_code code = GET_CODE (operands[0]);
+
+  if (code == LT || code == LE)
+    return pru_output_ltle_signed_cbranch (operands, is_near);
+  else if (code == GT || code == GE)
+    return pru_output_gtge_signed_cbranch (operands, is_near);
+  else
+      gcc_unreachable ();
+}
+
+/*
+   Optimized version of pru_output_signed_cbranch for constant second
+   operand.  */
+
+const char *
+pru_output_signed_cbranch_ubyteop2 (rtx *operands, bool is_near)
+{
+  static char buf[1024];
+  enum rtx_code code = GET_CODE (operands[0]);
+  int regop_sign_bit_pos = sign_bit_position (operands[1]);
+  const char *cmp_opstr;
+  const char *rcmp_opstr;
+
+  /* We must swap operands due to PRU's demand OP1 to be the immediate.  */
+  code = swap_condition (code);
+
+  /* Determine normal and reversed comparison operators for both positive
+     operands.  This enables us to go completely unsigned.
+
+     NOTE: We cannot use the R print modifier because we convert signed
+     comparison operators to unsigned ones.  */
+  switch (code)
+    {
+    case LT: cmp_opstr = "qblt"; rcmp_opstr = "qbge"; break;
+    case LE: cmp_opstr = "qble"; rcmp_opstr = "qbgt"; break;
+    case GT: cmp_opstr = "qbgt"; rcmp_opstr = "qble"; break;
+    case GE: cmp_opstr = "qbge"; rcmp_opstr = "qblt"; break;
+    default: gcc_unreachable ();
+    }
+
+  /* OP2 is a constant unsigned byte - utilize this info to generate
+     optimized code.  We can "remove half" of the op table above because
+     we know that OP2.b31 = 0 (remember that 0 <= OP2 <= 255).  */
+  if (code == LT || code == LE)
+    {
+      if (is_near)
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t.+8, %%1, %d\n\t"
+		  "%s\t%%l3, %%1, %%2",
+		  regop_sign_bit_pos,
+		  cmp_opstr);
+      else
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t.+12, %%1, %d\n\t"
+		  "%s\t.+8, %%1, %%2\n\t"
+		  "jmp\t%%%%label(%%l3)",
+		  regop_sign_bit_pos,
+		  rcmp_opstr);
+    }
+  else if (code == GT || code == GE)
+    {
+      if (is_near)
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t%%l3, %%1, %d\n\t"
+		  "%s\t%%l3, %%1, %%2",
+		  regop_sign_bit_pos,
+		  cmp_opstr);
+      else
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t.+8, %%1, %d\n\t"
+		  "%s\t.+8, %%1, %%2\n\t"
+		  "jmp\t%%%%label(%%l3)",
+		  regop_sign_bit_pos,
+		  rcmp_opstr);
+    }
+  else
+    gcc_unreachable ();
+
+  return buf;
+}
+
+/*
+   Optimized version of pru_output_signed_cbranch_ubyteop2 for constant
+   zero second operand.  */
+
+const char *
+pru_output_signed_cbranch_zeroop2 (rtx *operands, bool is_near)
+{
+  static char buf[1024];
+  enum rtx_code code = GET_CODE (operands[0]);
+  int regop_sign_bit_pos = sign_bit_position (operands[1]);
+
+  /* OP2 is a constant zero - utilize this info to simply check the
+     OP1 sign bit when comparing for LT or GE.  */
+  if (code == LT)
+    {
+      if (is_near)
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t%%l3, %%1, %d\n\t",
+		  regop_sign_bit_pos);
+      else
+	snprintf (buf, sizeof (buf),
+		  "qbbc\t.+8, %%1, %d\n\t"
+		  "jmp\t%%%%label(%%l3)",
+		  regop_sign_bit_pos);
+    }
+  else if (code == GE)
+    {
+      if (is_near)
+	snprintf (buf, sizeof (buf),
+		  "qbbc\t%%l3, %%1, %d\n\t",
+		  regop_sign_bit_pos);
+      else
+	snprintf (buf, sizeof (buf),
+		  "qbbs\t.+8, %%1, %d\n\t"
+		  "jmp\t%%%%label(%%l3)",
+		  regop_sign_bit_pos);
+    }
+  else
+    gcc_unreachable ();
+
+  return buf;
+}
+
+/* Addressing Modes.  */
+
+/* Return true if register REGNO is a valid base register.
+   STRICT_P is true if REG_OK_STRICT is in effect.  */
+
+bool
+pru_regno_ok_for_base_p (int regno, bool strict_p)
+{
+  if (!HARD_REGISTER_NUM_P (regno))
+    {
+      if (!strict_p)
+	return true;
+
+      if (!reg_renumber)
+	return false;
+
+      regno = reg_renumber[regno];
+    }
+
+  /* The fake registers will be eliminated to either the stack or
+     hard frame pointer, both of which are usually valid base registers.
+     Reload deals with the cases where the eliminated form isn't valid.  */
+  return (GP_REG_P (regno)
+	  || regno == FRAME_POINTER_REGNUM
+	  || regno == ARG_POINTER_REGNUM);
+}
+
+/* Return true if given xbbo constant OFFSET is valid.  */
+static bool
+pru_valid_const_ubyte_offset (machine_mode mode, HOST_WIDE_INT offset)
+{
+  bool valid = UBYTE_INT (offset);
+
+  /* Reload can split multi word accesses, so make sure we can address
+     the second word in a DI.  */
+  if (valid && GET_MODE_SIZE (mode) > GET_MODE_SIZE (SImode))
+    valid = UBYTE_INT (offset + GET_MODE_SIZE (mode) - 1);
+
+  return valid;
+}
+
+/* Recognize a CTABLE base address.  Return CTABLE entry index, or -1 if
+ * base was not found in the pragma-filled pru_ctable.  */
+int
+pru_get_ctable_exact_base_index (unsigned HOST_WIDE_INT caddr)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (pru_ctable); i++)
+    {
+      if (pru_ctable[i].valid && pru_ctable[i].base == caddr)
+	return i;
+    }
+  return -1;
+}
+
+
+/* Check if the given address can be addressed via CTABLE_BASE + UBYTE_OFFS,
+   and return the base CTABLE index if possible.  */
+int
+pru_get_ctable_base_index (unsigned HOST_WIDE_INT caddr)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (pru_ctable); i++)
+    {
+      if (pru_ctable[i].valid && IN_RANGE (caddr,
+					   pru_ctable[i].base,
+					   pru_ctable[i].base + 0xff))
+	return i;
+    }
+  return -1;
+}
+
+
+/* Return the offset from some CTABLE base for this address.  */
+int
+pru_get_ctable_base_offset (unsigned HOST_WIDE_INT caddr)
+{
+  int i;
+
+  i = pru_get_ctable_base_index (caddr);
+  gcc_assert (i >= 0);
+
+  return caddr - pru_ctable[i].base;
+}
+
+/* Return true if the address expression formed by BASE + OFFSET is
+   valid.  */
+static bool
+pru_valid_addr_expr_p (machine_mode mode, rtx base, rtx offset, bool strict_p)
+{
+  if (!strict_p && base != NULL_RTX && GET_CODE (base) == SUBREG)
+    base = SUBREG_REG (base);
+  if (!strict_p && offset != NULL_RTX && GET_CODE (offset) == SUBREG)
+    offset = SUBREG_REG (offset);
+
+  if (REG_P (base)
+      && pru_regno_ok_for_base_p (REGNO (base), strict_p)
+      && (offset == NULL_RTX
+	  || (CONST_INT_P (offset)
+	      && pru_valid_const_ubyte_offset (mode, INTVAL (offset)))
+	  || (REG_P (offset)
+	      && pru_regno_ok_for_index_p (REGNO (offset), strict_p))))
+    {
+      /*     base register + register offset
+       * OR  base register + UBYTE constant offset.  */
+      return true;
+    }
+  else if (REG_P (base)
+	   && pru_regno_ok_for_index_p (REGNO (base), strict_p)
+	   && (offset != NULL_RTX && ctable_base_operand (offset, VOIDmode)))
+    {
+      /*     base CTABLE constant base + register offset
+       * Note: GCC always puts the register as a first operand of PLUS.  */
+      return true;
+    }
+  else if (CONST_INT_P (base)
+	   && offset == NULL_RTX
+	   && (ctable_addr_operand (base, VOIDmode)))
+    {
+      /*     base CTABLE constant base + UBYTE constant offset.  */
+      return true;
+    }
+  else
+    {
+      return false;
+    }
+}
+
+/* Implement TARGET_LEGITIMATE_ADDRESS_P.  */
+static bool
+pru_legitimate_address_p (machine_mode mode,
+			    rtx operand, bool strict_p)
+{
+  switch (GET_CODE (operand))
+    {
+      /* Direct.  */
+    case SYMBOL_REF:
+    case LABEL_REF:
+    case CONST:
+    case CONST_DOUBLE:
+      return false;
+
+    case CONST_INT:
+      return ctable_addr_operand (operand, VOIDmode);
+
+      /* Register indirect.  */
+    case REG:
+      return pru_regno_ok_for_base_p (REGNO (operand), strict_p);
+
+      /* Register indirect with displacement.  */
+    case PLUS:
+	{
+	  rtx op0 = XEXP (operand, 0);
+	  rtx op1 = XEXP (operand, 1);
+
+	  return (pru_valid_addr_expr_p (mode, op0, op1, strict_p)
+		  || pru_valid_addr_expr_p (mode, op1, op0, strict_p));
+	}
+
+    default:
+      break;
+    }
+  return false;
+}
+
+/* Output assembly language related definitions.  */
+
+/* Implement TARGET_ASM_CONSTRUCTOR.  */
+static void
+pru_elf_asm_constructor (rtx symbol, int priority)
+{
+  char buf[23];
+  section *s;
+
+  if (priority == DEFAULT_INIT_PRIORITY)
+    snprintf (buf, sizeof (buf), ".init_array");
+  else
+    {
+      /* While priority is known to be in range [0, 65535], so 18 bytes
+	 would be enough, the compiler might not know that.  To avoid
+	 -Wformat-truncation false positive, use a larger size.  */
+      snprintf (buf, sizeof (buf), ".init_array.%.5u", priority);
+    }
+  s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL);
+  switch_to_section (s);
+  assemble_aligned_integer (INIT_ARRAY_ENTRY_BYTES, symbol);
+}
+
+/* Implement TARGET_ASM_DESTRUCTOR.  */
+static void
+pru_elf_asm_destructor (rtx symbol, int priority)
+{
+  char buf[23];
+  section *s;
+
+  if (priority == DEFAULT_INIT_PRIORITY)
+    snprintf (buf, sizeof (buf), ".fini_array");
+  else
+    {
+      /* While priority is known to be in range [0, 65535], so 18 bytes
+	 would be enough, the compiler might not know that.  To avoid
+	 -Wformat-truncation false positive, use a larger size.  */
+      snprintf (buf, sizeof (buf), ".fini_array.%.5u", priority);
+    }
+  s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL);
+  switch_to_section (s);
+  assemble_aligned_integer (INIT_ARRAY_ENTRY_BYTES, symbol);
+}
+
+/* Map rtx_code to unsigned PRU branch op suffix.  Callers must
+   handle sign comparison themselves for signed operations.  */
+static const char *
+pru_comparison_str (enum rtx_code cond)
+{
+  switch (cond)
+    {
+    case NE:  return "ne";
+    case EQ:  return "eq";
+    case GEU: return "ge";
+    case GTU: return "gt";
+    case LEU: return "le";
+    case LTU: return "lt";
+    default: gcc_unreachable ();
+    }
+}
+
+/* Access some RTX as INT_MODE.  If X is a CONST_FIXED we can get
+   the bit representation of X by "casting" it to CONST_INT.  */
+
+static rtx
+pru_to_int_mode (rtx x)
+{
+  machine_mode mode = GET_MODE (x);
+
+  return VOIDmode == mode
+    ? x
+    : simplify_gen_subreg (int_mode_for_mode (mode).require (), x, mode, 0);
+}
+
+/* Translate between the MachineDescription notion
+   of 8-bit consecutive registers, to the PRU
+   assembler syntax of REGWORD[.SUBREG].  */
+static const char *
+pru_asm_regname (rtx op)
+{
+  static char canon_reg_names[3][LAST_GP_REG][8];
+  int speci, regi;
+
+  gcc_assert (REG_P (op));
+
+  if (!canon_reg_names[0][0][0])
+    {
+      for (regi = 0; regi < LAST_GP_REG; regi++)
+	for (speci = 0; speci < 3; speci++)
+	  {
+	    const int sz = (speci == 0) ? 1 : ((speci == 1) ? 2 : 4);
+	    if ((regi + sz) > (32 * 4))
+	      continue;	/* Invalid entry.  */
+
+	    /* Construct the lookup table.  */
+	    const char *suffix = "";
+
+	    switch ((sz << 8) | (regi % 4))
+	      {
+	      case (1 << 8) | 0: suffix = ".b0"; break;
+	      case (1 << 8) | 1: suffix = ".b1"; break;
+	      case (1 << 8) | 2: suffix = ".b2"; break;
+	      case (1 << 8) | 3: suffix = ".b3"; break;
+	      case (2 << 8) | 0: suffix = ".w0"; break;
+	      case (2 << 8) | 1: suffix = ".w1"; break;
+	      case (2 << 8) | 2: suffix = ".w2"; break;
+	      case (4 << 8) | 0: suffix = ""; break;
+	      default:
+		/* Invalid entry.  */
+		continue;
+	      }
+	    sprintf (&canon_reg_names[speci][regi][0],
+		     "r%d%s", regi / 4, suffix);
+	  }
+    }
+
+  switch (GET_MODE_SIZE (GET_MODE (op)))
+    {
+    case 1: speci = 0; break;
+    case 2: speci = 1; break;
+    case 4: speci = 2; break;
+    case 8: speci = 2; break; /* Existing GCC test cases are not using %F.  */
+    default: gcc_unreachable ();
+    }
+  regi = REGNO (op);
+  gcc_assert (regi < LAST_GP_REG);
+  gcc_assert (canon_reg_names[speci][regi][0]);
+
+  return &canon_reg_names[speci][regi][0];
+}
+
+/* Print the operand OP to file stream FILE modified by LETTER.
+   LETTER can be one of:
+
+     b: prints the register byte start (used by LBBO/SBBO)
+     B: prints 'c' or 'b' for CTABLE or REG base in a memory address
+     F: Full 32-bit register.
+     H: Higher 16-bits of a const_int operand
+     L: Lower 16-bits of a const_int operand
+     N: prints next 32-bit register (upper 32bits of a 64bit REG couple)
+     P: prints swapped condition.
+     Q: prints swapped and reversed condition.
+     R: prints reversed condition.
+     S: print operand mode size (but do not print the operand itself)
+     T: print exact_log2 () for const_int operands
+     V: print exact_log2 () of negated const_int operands
+     w: Lower 32-bits of a const_int operand
+     W: Upper 32-bits of a const_int operand
+     y: print the next 8-bit register (regardless of op size)
+     z: print the second next 8-bit register (regardless of op size)
+*/
+static void
+pru_print_operand (FILE *file, rtx op, int letter)
+{
+
+  switch (letter)
+    {
+    case 'S':
+      fprintf (file, "%d", GET_MODE_SIZE (GET_MODE (op)));
+      return;
+
+    default:
+      break;
+    }
+
+  if (comparison_operator (op, VOIDmode))
+    {
+      enum rtx_code cond = GET_CODE (op);
+      gcc_assert (!pru_signed_cmp_operator (op, VOIDmode));
+
+      switch (letter)
+	{
+	case 0:
+	  fprintf (file, "%s", pru_comparison_str (cond));
+	  return;
+	case 'P':
+	  fprintf (file, "%s", pru_comparison_str (swap_condition (cond)));
+	  return;
+	case 'Q':
+	  cond = swap_condition (cond);
+	  /* Fall through to reverse.  */
+	case 'R':
+	  fprintf (file, "%s", pru_comparison_str (reverse_condition (cond)));
+	  return;
+	}
+    }
+
+  switch (GET_CODE (op))
+    {
+    case REG:
+      if (letter == 0)
+	{
+	  fprintf (file, "%s", pru_asm_regname (op));
+	  return;
+	}
+      else if (letter == 'b')
+	{
+	  gcc_assert (REGNO (op) <= LAST_NONIO_GP_REG);
+	  fprintf (file, "r%d.b%d", REGNO (op) / 4, REGNO (op) % 4);
+	  return;
+	}
+      else if (letter == 'F')
+	{
+	  gcc_assert (REGNO (op) <= LAST_NONIO_GP_REG);
+	  gcc_assert (REGNO (op) % 4 == 0);
+	  fprintf (file, "r%d", REGNO (op) / 4);
+	  return;
+	}
+      else if (letter == 'N')
+	{
+	  gcc_assert (REGNO (op) <= LAST_NONIO_GP_REG);
+	  gcc_assert (REGNO (op) % 4 == 0);
+	  fprintf (file, "r%d", REGNO (op) / 4 + 1);
+	  return;
+	}
+      else if (letter == 'y')
+	{
+	  gcc_assert (REGNO (op) <= LAST_NONIO_GP_REG - 1);
+	  fprintf (file, "%s", reg_names[REGNO (op) + 1]);
+	  return;
+	}
+      else if (letter == 'z')
+	{
+	  gcc_assert (REGNO (op) <= LAST_NONIO_GP_REG - 2);
+	  fprintf (file, "%s", reg_names[REGNO (op) + 2]);
+	  return;
+	}
+      break;
+
+    case CONST_INT:
+      if (letter == 'H')
+	{
+	  HOST_WIDE_INT val = INTVAL (op);
+	  val = (val >> 16) & 0xFFFF;
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      else if (letter == 'L')
+	{
+	  HOST_WIDE_INT val = INTVAL (op);
+	  val &= 0xFFFF;
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      else if (letter == 'T')
+	{
+	  /* The predicate should have already validated the 1-high-bit
+	     requirement.  Use CTZ here to deal with constant's sign
+	     extension.  */
+	  HOST_WIDE_INT val = wi::ctz (INTVAL (op));
+	  gcc_assert (val >= 0 && val <= 31);
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      else if (letter == 'V')
+	{
+	  HOST_WIDE_INT val = wi::ctz (~INTVAL (op));
+	  gcc_assert (val >= 0 && val <= 31);
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      else if (letter == 'w')
+	{
+	  HOST_WIDE_INT val = INTVAL (op) & 0xffffffff;
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      else if (letter == 'W')
+	{
+	  HOST_WIDE_INT val = (INTVAL (op) >> 32) & 0xffffffff;
+	  output_addr_const (file, gen_int_mode (val, SImode));
+	  return;
+	}
+      /* Else, fall through.  */
+
+    case CONST:
+    case LABEL_REF:
+    case SYMBOL_REF:
+      if (letter == 0)
+	{
+	  output_addr_const (file, op);
+	  return;
+	}
+      break;
+
+    case CONST_FIXED:
+	{
+	  HOST_WIDE_INT ival = INTVAL (pru_to_int_mode (op));
+	  if (letter != 0)
+	    output_operand_lossage ("Unsupported code '%c' for fixed-point:",
+				    letter);
+	  fprintf (file, HOST_WIDE_INT_PRINT_DEC, ival);
+	  return;
+	}
+      break;
+
+    case CONST_DOUBLE:
+      if (letter == 0)
+	{
+	  long val;
+
+	  if (GET_MODE (op) != SFmode)
+	    fatal_insn ("internal compiler error.  Unknown mode:", op);
+	  REAL_VALUE_TO_TARGET_SINGLE (*CONST_DOUBLE_REAL_VALUE (op), val);
+	  fprintf (file, "0x%lx", val);
+	  return;
+	}
+      else if (letter == 'w' || letter == 'W')
+	{
+	  long t[2];
+	  REAL_VALUE_TO_TARGET_DOUBLE (*CONST_DOUBLE_REAL_VALUE (op), t);
+	  fprintf (file, "0x%lx", t[letter == 'w' ? 0 : 1]);
+	  return;
+	}
+      else
+	{
+	  gcc_unreachable ();
+	}
+      break;
+
+    case SUBREG:
+    case MEM:
+      if (letter == 0)
+	{
+	  output_address (VOIDmode, op);
+	  return;
+	}
+      else if (letter == 'B')
+	{
+	  rtx base = XEXP (op, 0);
+	  if (GET_CODE (base) == PLUS)
+	    {
+	      rtx op0 = XEXP (base, 0);
+	      rtx op1 = XEXP (base, 1);
+
+	      /* PLUS cannot have two constant operands, so one
+		 of them must be a REG, hence we must check for an
+		 exact base address.  */
+	      if (ctable_base_operand (op0, VOIDmode)
+		  || ctable_base_operand (op1, VOIDmode))
+		{
+		  fprintf (file, "c");
+		  return;
+		}
+	      else if (REG_P (op0) || REG_P (op1))
+		{
+		  fprintf (file, "b");
+		  return;
+		}
+	      else
+		gcc_unreachable ();
+	    }
+	  else if (REG_P (base))
+	    {
+	      fprintf (file, "b");
+	      return;
+	    }
+	  else if (ctable_addr_operand (base, VOIDmode))
+	    {
+	      fprintf (file, "c");
+	      return;
+	    }
+	  else
+	    gcc_unreachable ();
+	}
+      break;
+
+    case CODE_LABEL:
+      if (letter == 0)
+	{
+	  output_addr_const (file, op);
+	  return;
+	}
+      break;
+
+    default:
+      break;
+    }
+
+  output_operand_lossage ("Unsupported operand %s for code '%c'",
+			  GET_RTX_NAME (GET_CODE (op)), letter);
+  gcc_unreachable ();
+}
+
+/* Implement TARGET_PRINT_OPERAND_ADDRESS.  */
+static void
+pru_print_operand_address (FILE *file, machine_mode mode, rtx op)
+{
+  if (GET_CODE (op) != REG && CONSTANT_ADDRESS_P (op)
+      && text_segment_operand (op, VOIDmode))
+    {
+      fprintf (stderr, "Unexpectred text address?\n");
+      debug_rtx (op);
+      gcc_unreachable ();
+    }
+
+  switch (GET_CODE (op))
+    {
+    case CONST:
+    case LABEL_REF:
+    case CONST_DOUBLE:
+    case SYMBOL_REF:
+      break;
+
+    case CONST_INT:
+      {
+	unsigned HOST_WIDE_INT caddr = INTVAL (op);
+	int base = pru_get_ctable_base_index (caddr);
+	int offs = pru_get_ctable_base_offset (caddr);
+	gcc_assert (base >= 0);
+	fprintf (file, "%d, %d", base, offs);
+	return;
+      }
+      break;
+
+    case PLUS:
+      {
+	int base;
+	rtx op0 = XEXP (op, 0);
+	rtx op1 = XEXP (op, 1);
+
+	if (REG_P (op0) && CONST_INT_P (op1)
+	    && pru_get_ctable_exact_base_index (INTVAL (op1)) >= 0)
+	  {
+	    base = pru_get_ctable_exact_base_index (INTVAL (op1));
+	    fprintf (file, "%d, %s", base, pru_asm_regname (op0));
+	    return;
+	  }
+	else if (REG_P (op1) && CONST_INT_P (op0)
+		 && pru_get_ctable_exact_base_index (INTVAL (op0)) >= 0)
+	  {
+	    base = pru_get_ctable_exact_base_index (INTVAL (op0));
+	    fprintf (file, "%d, %s", base, pru_asm_regname (op1));
+	    return;
+	  }
+	else if (REG_P (op0) && CONSTANT_P (op1))
+	  {
+	    fprintf (file, "%s, ", pru_asm_regname (op0));
+	    output_addr_const (file, op1);
+	    return;
+	  }
+	else if (REG_P (op1) && CONSTANT_P (op0))
+	  {
+	    fprintf (file, "%s, ", pru_asm_regname (op1));
+	    output_addr_const (file, op0);
+	    return;
+	  }
+	else if (REG_P (op1) && REG_P (op0))
+	  {
+	    fprintf (file, "%s, %s", pru_asm_regname (op0),
+				     pru_asm_regname (op1));
+	    return;
+	  }
+      }
+      break;
+
+    case REG:
+      fprintf (file, "%s, 0", pru_asm_regname (op));
+      return;
+
+    case MEM:
+      {
+	rtx base = XEXP (op, 0);
+	pru_print_operand_address (file, mode, base);
+	return;
+      }
+    default:
+      break;
+    }
+
+  fprintf (stderr, "Missing way to print address\n");
+  debug_rtx (op);
+  gcc_unreachable ();
+}
+
+/* Implement TARGET_ASM_FUNCTION_PROLOGUE.  */
+static void
+pru_asm_function_prologue (FILE *file)
+{
+  if (flag_verbose_asm || flag_debug_asm)
+    {
+      pru_compute_frame_layout ();
+      pru_dump_frame_layout (file);
+    }
+}
+
+/* Implement `TARGET_ASM_INTEGER'.
+   Target hook for assembling integer objects.  PRU version needs
+   special handling for references to pmem.  Code copied from AVR.  */
+
+static bool
+pru_assemble_integer (rtx x, unsigned int size, int aligned_p)
+{
+  if (size == POINTER_SIZE / BITS_PER_UNIT
+      && aligned_p
+      && text_segment_operand (x, VOIDmode))
+    {
+      fputs ("\t.4byte\t%pmem(", asm_out_file);
+      output_addr_const (asm_out_file, x);
+      fputs (")\n", asm_out_file);
+
+      return true;
+    }
+  else if (size == INIT_ARRAY_ENTRY_BYTES
+	   && aligned_p
+	   && text_segment_operand (x, VOIDmode))
+    {
+      fputs ("\t.2byte\t%pmem(", asm_out_file);
+      output_addr_const (asm_out_file, x);
+      fputs (")\n", asm_out_file);
+
+      return true;
+    }
+  else
+    {
+      return default_assemble_integer (x, size, aligned_p);
+    }
+}
+
+/* Implement TARGET_ASM_FILETARGET_ASM_FILE_START_START.  */
+
+static void
+pru_file_start (void)
+{
+  default_file_start ();
+
+  /* Compiler will take care of placing %label, so there is no
+     need to confuse users with this warning.  */
+  fprintf (asm_out_file, "\t.set no_warn_regname_label\n");
+}
+
+/* Function argument related.  */
+
+/* Return the number of bytes needed for storing an argument with
+   the given MODE and TYPE.  */
+static int
+pru_function_arg_size (machine_mode mode, const_tree type)
+{
+  HOST_WIDE_INT param_size;
+
+  if (mode == BLKmode)
+    param_size = int_size_in_bytes (type);
+  else
+    param_size = GET_MODE_SIZE (mode);
+
+  /* Convert to words (round up).  */
+  param_size = (UNITS_PER_WORD - 1 + param_size) / UNITS_PER_WORD;
+  gcc_assert (param_size >= 0);
+
+  return param_size;
+}
+
+/* Check if argument with the given size must be
+   passed/returned in a register.
+
+   Reference:
+   https://e2e.ti.com/support/development_tools/compiler/f/343/p/650176/2393029
+
+   Arguments other than 8/16/24/32/64bits are passed on stack.  */
+static bool
+pru_arg_in_reg_bysize (size_t sz)
+{
+  return sz == 1 || sz == 2 || sz == 3 || sz == 4 || sz == 8;
+}
+
+/* Helper function to get the starting storage HW register for an argument,
+   or -1 if it must be passed on stack.  The cum_v state is not changed.  */
+static int
+pru_function_arg_regi (cumulative_args_t cum_v,
+		       machine_mode mode, const_tree type,
+		       bool named)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
+  size_t argsize = pru_function_arg_size (mode, type);
+  size_t i, bi;
+  int regi = -1;
+
+  if (!pru_arg_in_reg_bysize (argsize))
+    return -1;
+
+  if (!named)
+    return -1;
+
+  /* Find the first available slot that fits.  Yes, that's the PRU ABI.  */
+  for (i = 0; regi < 0 && i < ARRAY_SIZE (cum->regs_used); i++)
+    {
+      if (mode == BLKmode)
+	{
+	  /* Structs are passed, beginning at a full register.  */
+	  if ((i % 4) != 0)
+	    continue;
+	}
+      else
+	{
+	  /* Scalar arguments.  */
+
+	  /* Ensure SI and DI arguments are stored in full registers only.  */
+	  if ((argsize >= 4) && (i % 4) != 0)
+	    continue;
+
+	  /* rX.w0/w1/w2 are OK.  But avoid spreading the second byte
+	     into a different full register.  */
+	  if (argsize == 2 && (i % 4) == 3)
+	    continue;
+	}
+
+      for (bi = 0;
+	   bi < argsize && (bi + i) < ARRAY_SIZE (cum->regs_used);
+	   bi++)
+	{
+	  if (cum->regs_used[bi + i])
+	    break;
+	}
+      if (bi == argsize)
+	regi = FIRST_ARG_REGNO + i;
+    }
+
+  return regi;
+}
+
+/* Mark CUM_V that a function argument will occupy HW register slot starting
+   at REGI.  The number of consecutive 8-bit HW registers marked as occupied
+   depends on the MODE and TYPE of the argument.  */
+static void
+pru_function_arg_regi_mark_slot (int regi,
+				 cumulative_args_t cum_v,
+				 machine_mode mode, const_tree type,
+				 bool named)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
+  HOST_WIDE_INT param_size = pru_function_arg_size (mode, type);
+
+  gcc_assert (named);
+
+  /* Mark all byte sub-registers occupied by argument as used.  */
+  while (param_size--)
+    {
+      gcc_assert (regi >= FIRST_ARG_REGNO && regi <= LAST_ARG_REGNO);
+      gcc_assert (!cum->regs_used[regi - FIRST_ARG_REGNO]);
+      cum->regs_used[regi - FIRST_ARG_REGNO] = true;
+      regi++;
+    }
+}
+
+/* Define where to put the arguments to a function.  Value is zero to
+   push the argument on the stack, or a hard register in which to
+   store the argument.
+
+   MODE is the argument's machine mode.
+   TYPE is the data type of the argument (as a tree).
+   This is null for libcalls where that information may
+   not be available.
+   CUM is a variable of type CUMULATIVE_ARGS which gives info about
+   the preceding args and about the function being called.
+   NAMED is nonzero if this argument is a named parameter
+   (otherwise it is an extra parameter matching an ellipsis).  */
+
+static rtx
+pru_function_arg (cumulative_args_t cum_v, machine_mode mode,
+		    const_tree type,
+		    bool named)
+{
+  rtx return_rtx = NULL_RTX;
+  int regi = pru_function_arg_regi (cum_v, mode, type, named);
+
+  if (regi >= 0)
+    return_rtx = gen_rtx_REG (mode, regi);
+
+  return return_rtx;
+}
+
+/* Return number of bytes, at the beginning of the argument, that must be
+   put in registers.  0 is the argument is entirely in registers or entirely
+   in memory.  */
+
+static int
+pru_arg_partial_bytes (cumulative_args_t cum_v ATTRIBUTE_UNUSED,
+		       machine_mode mode ATTRIBUTE_UNUSED,
+		       tree type ATTRIBUTE_UNUSED,
+		       bool named ATTRIBUTE_UNUSED)
+{
+  return 0;
+}
+
+/* Update the data in CUM to advance over an argument of mode MODE
+   and data type TYPE; TYPE is null for libcalls where that information
+   may not be available.  */
+
+static void
+pru_function_arg_advance (cumulative_args_t cum_v, machine_mode mode,
+			    const_tree type,
+			    bool named)
+{
+  int regi = pru_function_arg_regi (cum_v, mode, type, named);
+
+  if (regi >= 0)
+    pru_function_arg_regi_mark_slot (regi, cum_v, mode, type, named);
+}
+
+/* Implement TARGET_FUNCTION_VALUE.  */
+static rtx
+pru_function_value (const_tree ret_type, const_tree fn ATTRIBUTE_UNUSED,
+		      bool outgoing ATTRIBUTE_UNUSED)
+{
+  return gen_rtx_REG (TYPE_MODE (ret_type), FIRST_RETVAL_REGNO);
+}
+
+/* Implement TARGET_LIBCALL_VALUE.  */
+static rtx
+pru_libcall_value (machine_mode mode, const_rtx fun ATTRIBUTE_UNUSED)
+{
+  return gen_rtx_REG (mode, FIRST_RETVAL_REGNO);
+}
+
+/* Implement TARGET_FUNCTION_VALUE_REGNO_P.  */
+static bool
+pru_function_value_regno_p (const unsigned int regno)
+{
+  return regno == FIRST_RETVAL_REGNO;
+}
+
+/* Implement TARGET_RETURN_IN_MEMORY.  */
+bool
+pru_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
+{
+  bool in_memory = (!pru_arg_in_reg_bysize (int_size_in_bytes (type))
+		    || int_size_in_bytes (type) == -1);
+
+  return in_memory;
+}
+
+/* Implement TARGET_CAN_USE_DOLOOP_P.  */
+
+static bool
+pru_can_use_doloop_p (const widest_int &, const widest_int &iterations_max,
+		      unsigned int loop_depth, bool)
+{
+  /* Considering limitations in the hardware, only use doloop
+     for innermost loops which must be entered from the top.  */
+  if (loop_depth > 1)
+    return false;
+  /* PRU internal loop counter is 16bits wide.  Remember that iterations_max
+     holds the maximum number of loop latch executions, while PRU loop
+     instruction needs the count of loop body executions.  */
+  if (iterations_max == 0 || wi::geu_p (iterations_max, 0xffff))
+    return false;
+
+  return true;
+}
+
+/* NULL if INSN insn is valid within a low-overhead loop.
+   Otherwise return why doloop cannot be applied.  */
+
+static const char *
+pru_invalid_within_doloop (const rtx_insn *insn)
+{
+  if (CALL_P (insn))
+    return "Function call in the loop.";
+
+  if (JUMP_P (insn) && INSN_CODE (insn) == CODE_FOR_return)
+    return "Return from a call instruction in the loop.";
+
+  if (NONDEBUG_INSN_P (insn)
+      && INSN_CODE (insn) < 0
+      && (GET_CODE (PATTERN (insn)) == ASM_INPUT
+	  || asm_noperands (PATTERN (insn)) >= 0))
+    return "Loop contains asm statement.";
+
+  return NULL;
+}
+
+
+/* Figure out where to put LABEL, which is the label for a repeat loop.
+   The loop ends just before LAST_INSN.  If SHARED, insns other than the
+   "repeat" might use LABEL to jump to the loop's continuation point.
+
+   Return the last instruction in the adjusted loop.  */
+
+static rtx_insn *
+pru_insert_loop_label_last (rtx_insn *last_insn, rtx_code_label *label,
+			    bool shared)
+{
+  rtx_insn *next, *prev;
+  int count = 0, code, icode;
+
+  if (dump_file)
+    fprintf (dump_file, "considering end of repeat loop at insn %d\n",
+	     INSN_UID (last_insn));
+
+  /* Set PREV to the last insn in the loop.  */
+  prev = PREV_INSN (last_insn);
+
+  /* Set NEXT to the next insn after the loop label.  */
+  next = last_insn;
+  if (!shared)
+    while (prev != 0)
+      {
+	code = GET_CODE (prev);
+	if (code == CALL_INSN || code == CODE_LABEL || code == BARRIER)
+	  break;
+
+	if (INSN_P (prev))
+	  {
+	    if (GET_CODE (PATTERN (prev)) == SEQUENCE)
+	      prev = as_a <rtx_insn *> (XVECEXP (PATTERN (prev), 0, 1));
+
+	    /* Other insns that should not be in the last two opcodes.  */
+	    icode = recog_memoized (prev);
+	    if (icode < 0
+		|| icode == CODE_FOR_pruloophi
+		|| icode == CODE_FOR_pruloopsi)
+	      break;
+
+	    count++;
+	    next = prev;
+	    if (dump_file)
+	      print_rtl_single (dump_file, next);
+	    if (count == 2)
+	      break;
+	  }
+	prev = PREV_INSN (prev);
+      }
+
+  /* Insert the nops.  */
+  if (dump_file && count < 2)
+    fprintf (dump_file, "Adding %d nop%s inside loop\n\n",
+	     2 - count, count == 1 ? "" : "s");
+
+  for (; count < 2; count++)
+      emit_insn_before (gen_nop (), last_insn);
+
+  /* Insert the label.  */
+  emit_label_before (label, last_insn);
+
+  return last_insn;
+}
+
+/* If IS_END is false, expand a canonical doloop_begin RTL into the
+   PRU-specific doloop_begin_internal.  Otherwise expand doloop_end to
+   doloop_end_internal.  */
+void
+pru_emit_doloop (rtx *operands, int is_end)
+{
+  rtx tag;
+
+  if (cfun->machine->doloop_tags == 0
+      || cfun->machine->doloop_tag_from_end == is_end)
+    {
+      cfun->machine->doloop_tags++;
+      cfun->machine->doloop_tag_from_end = is_end;
+    }
+
+  tag = GEN_INT (cfun->machine->doloop_tags - 1);
+  machine_mode opmode = GET_MODE (operands[0]);
+  if (is_end)
+    {
+      if (opmode == HImode)
+	emit_jump_insn (gen_doloop_end_internalhi (operands[0],
+						   operands[1], tag));
+      else if (opmode == SImode)
+	emit_jump_insn (gen_doloop_end_internalsi (operands[0],
+						   operands[1], tag));
+      else
+	gcc_unreachable ();
+    }
+  else
+    {
+      if (opmode == HImode)
+	emit_insn (gen_doloop_begin_internalhi (operands[0], operands[0], tag));
+      else if (opmode == SImode)
+	emit_insn (gen_doloop_begin_internalsi (operands[0], operands[0], tag));
+      else
+	gcc_unreachable ();
+    }
+}
+
+
+/* Code for converting doloop_begins and doloop_ends into valid
+   PRU instructions.  Idea and code snippets borrowed from mep port.
+
+   A doloop_begin is just a placeholder:
+
+	$count = unspec ($count)
+
+   where $count is initially the number of iterations.
+   doloop_end has the form:
+
+	if (--$count == 0) goto label
+
+   The counter variable is private to the doloop insns, nothing else
+   relies on its value.
+
+   There are three cases, in decreasing order of preference:
+
+      1.  A loop has exactly one doloop_begin and one doloop_end.
+	 The doloop_end branches to the first instruction after
+	 the doloop_begin.
+
+	 In this case we can replace the doloop_begin with a LOOP
+	 instruction and remove the doloop_end.  I.e.:
+
+		$count1 = unspec ($count1)
+	    label:
+		...
+		if (--$count2 != 0) goto label
+
+	  becomes:
+
+		LOOP end_label,$count1
+	    label:
+		...
+	    end_label:
+		# end loop
+
+      2.  As for (1), except there are several doloop_ends.  One of them
+	 (call it X) falls through to a label L.  All the others fall
+	 through to branches to L.
+
+	 In this case, we remove X and replace the other doloop_ends
+	 with branches to the LOOP label.  For example:
+
+		$count1 = unspec ($count1)
+	    label:
+		...
+		if (--$count1 != 0) goto label
+	    end_label:
+		...
+		if (--$count2 != 0) goto label
+		goto end_label
+
+	 becomes:
+
+		LOOP end_label,$count1
+	    label:
+		...
+	    end_label:
+		# end repeat
+		...
+		goto end_label
+
+      3.  The fallback case.  Replace doloop_begins with:
+
+		$count = $count
+
+	 Replace doloop_ends with the equivalent of:
+
+		$count = $count - 1
+		if ($count != 0) goto loop_label
+
+	 */
+
+/* A structure describing one doloop_begin.  */
+struct pru_doloop_begin {
+  /* The next doloop_begin with the same tag.  */
+  struct pru_doloop_begin *next;
+
+  /* The instruction itself.  */
+  rtx_insn *insn;
+
+  /* The initial counter value.  */
+  rtx loop_count;
+
+  /* The counter register.  */
+  rtx counter;
+};
+
+/* A structure describing a doloop_end.  */
+struct pru_doloop_end {
+  /* The next doloop_end with the same loop tag.  */
+  struct pru_doloop_end *next;
+
+  /* The instruction itself.  */
+  rtx_insn *insn;
+
+  /* The first instruction after INSN when the branch isn't taken.  */
+  rtx_insn *fallthrough;
+
+  /* The location of the counter value.  Since doloop_end_internal is a
+     jump instruction, it has to allow the counter to be stored anywhere
+     (any non-fixed register).  */
+  rtx counter;
+
+  /* The target label (the place where the insn branches when the counter
+     isn't zero).  */
+  rtx label;
+
+  /* A scratch register.  Only available when COUNTER isn't stored
+     in a general register.  */
+  rtx scratch;
+};
+
+
+/* One do-while loop.  */
+struct pru_doloop {
+  /* All the doloop_begins for this loop (in no particular order).  */
+  struct pru_doloop_begin *begin;
+
+  /* All the doloop_ends.  When there is more than one, arrange things
+     so that the first one is the most likely to be X in case (2) above.  */
+  struct pru_doloop_end *end;
+};
+
+
+/* Return true if LOOP can be converted into LOOP form
+   (that is, if it matches cases (1) or (2) above).  */
+
+static bool
+pru_repeat_loop_p (struct pru_doloop *loop)
+{
+  struct pru_doloop_end *end;
+  rtx_insn *fallthrough;
+
+  /* There must be exactly one doloop_begin and at least one doloop_end.  */
+  if (loop->begin == 0 || loop->end == 0 || loop->begin->next != 0)
+    return false;
+
+  /* The first doloop_end (X) must branch back to the insn after
+     the doloop_begin.  */
+  if (prev_real_insn (as_a<rtx_insn *> (loop->end->label)) != loop->begin->insn)
+    return false;
+
+  /* Check that the first doloop_end (X) can actually reach
+     doloop_begin () with U8_PCREL relocation for LOOP instruction.  */
+  if (get_attr_length (loop->end->insn) != 4)
+    return false;
+
+  /* All the other doloop_ends must branch to the same place as X.
+     When the branch isn't taken, they must jump to the instruction
+     after X.  */
+  fallthrough = loop->end->fallthrough;
+  for (end = loop->end->next; end != 0; end = end->next)
+    if (end->label != loop->end->label
+	|| !simplejump_p (end->fallthrough)
+	|| fallthrough
+	   != next_real_insn (JUMP_LABEL_AS_INSN (end->fallthrough)))
+      return false;
+
+  return true;
+}
+
+
+/* The main repeat reorg function.  See comment above for details.  */
+
+static void
+pru_reorg_loop (rtx_insn *insns)
+{
+  rtx_insn *insn;
+  struct pru_doloop *loops, *loop;
+  struct pru_doloop_begin *begin;
+  struct pru_doloop_end *end;
+  size_t tmpsz;
+
+  /* Quick exit if we haven't created any loops.  */
+  if (cfun->machine->doloop_tags == 0)
+    return;
+
+  /* Create an array of pru_doloop structures.  */
+  tmpsz = sizeof (loops[0]) * cfun->machine->doloop_tags;
+  loops = (struct pru_doloop *) alloca (tmpsz);
+  memset (loops, 0, sizeof (loops[0]) * cfun->machine->doloop_tags);
+
+  /* Search the function for do-while insns and group them by loop tag.  */
+  for (insn = insns; insn; insn = NEXT_INSN (insn))
+    if (INSN_P (insn))
+      switch (recog_memoized (insn))
+	{
+	case CODE_FOR_doloop_begin_internalhi:
+	case CODE_FOR_doloop_begin_internalsi:
+	  insn_extract (insn);
+	  loop = &loops[INTVAL (recog_data.operand[2])];
+
+	  tmpsz = sizeof (struct pru_doloop_begin);
+	  begin = (struct pru_doloop_begin *) alloca (tmpsz);
+	  begin->next = loop->begin;
+	  begin->insn = insn;
+	  begin->loop_count = recog_data.operand[1];
+	  begin->counter = recog_data.operand[0];
+
+	  loop->begin = begin;
+	  break;
+
+	case CODE_FOR_doloop_end_internalhi:
+	case CODE_FOR_doloop_end_internalsi:
+	  insn_extract (insn);
+	  loop = &loops[INTVAL (recog_data.operand[2])];
+
+	  tmpsz = sizeof (struct pru_doloop_end);
+	  end = (struct pru_doloop_end *) alloca (tmpsz);
+	  end->insn = insn;
+	  end->fallthrough = next_real_insn (insn);
+	  end->counter = recog_data.operand[0];
+	  end->label = recog_data.operand[1];
+	  end->scratch = recog_data.operand[3];
+
+	  /* If this insn falls through to an unconditional jump,
+	     give it a lower priority than the others.  */
+	  if (loop->end != 0 && simplejump_p (end->fallthrough))
+	    {
+	      end->next = loop->end->next;
+	      loop->end->next = end;
+	    }
+	  else
+	    {
+	      end->next = loop->end;
+	      loop->end = end;
+	    }
+	  break;
+	}
+
+  /* Convert the insns for each loop in turn.  */
+  for (loop = loops; loop < loops + cfun->machine->doloop_tags; loop++)
+    if (pru_repeat_loop_p (loop))
+      {
+	/* Case (1) or (2).  */
+	rtx_code_label *repeat_label;
+	rtx label_ref;
+
+	/* Create a new label for the repeat insn.  */
+	repeat_label = gen_label_rtx ();
+
+	/* Replace the doloop_begin with a repeat.  We get rid
+	   of the iteration register because LOOP instruction
+	   will utilize an internal for the PRU core LOOP register.  */
+	label_ref = gen_rtx_LABEL_REF (VOIDmode, repeat_label);
+	machine_mode loop_mode = GET_MODE (loop->begin->loop_count);
+	if (loop_mode == HImode)
+	  emit_insn_before (gen_pruloophi (loop->begin->loop_count, label_ref),
+			    loop->begin->insn);
+	else if (loop_mode == SImode)
+	  {
+	    rtx loop_rtx = gen_pruloopsi (loop->begin->loop_count, label_ref);
+	    emit_insn_before (loop_rtx, loop->begin->insn);
+	  }
+	else if (loop_mode == VOIDmode)
+	  {
+	    gcc_assert (CONST_INT_P (loop->begin->loop_count));
+	    gcc_assert (UBYTE_INT ( INTVAL (loop->begin->loop_count)));
+	    rtx loop_rtx = gen_pruloopsi (loop->begin->loop_count, label_ref);
+	    emit_insn_before (loop_rtx, loop->begin->insn);
+	  }
+	else
+	  gcc_unreachable ();
+	delete_insn (loop->begin->insn);
+
+	/* Insert the repeat label before the first doloop_end.
+	   Fill the gap with nops if LOOP insn is less than 2
+	   instructions away than loop->end.  */
+	pru_insert_loop_label_last (loop->end->insn, repeat_label,
+				    loop->end->next != 0);
+
+	/* Emit a pruloop_end (to improve the readability of the output).  */
+	emit_insn_before (gen_pruloop_end (), loop->end->insn);
+
+	/* HACK: TODO: This is usually not needed, but is required for
+	   a few rare cases where a JUMP that breaks the loop
+	   references the LOOP_END address.  In other words, since
+	   we're missing a real "loop_end" instruction, a loop "break"
+	   may accidentally reference the loop end itself, and thus
+	   continuing the cycle.  */
+	for (insn = NEXT_INSN (loop->end->insn);
+	     insn != next_real_insn (loop->end->insn);
+	     insn = NEXT_INSN (insn))
+	  {
+	    if (LABEL_P (insn) && LABEL_NUSES (insn) > 0)
+	      emit_insn_before (gen_nop_loop_guard (), loop->end->insn);
+	  }
+
+	/* Delete the first doloop_end.  */
+	delete_insn (loop->end->insn);
+
+	/* Replace the others with branches to REPEAT_LABEL.  */
+	for (end = loop->end->next; end != 0; end = end->next)
+	  {
+	    rtx_insn *newjmp;
+	    newjmp = emit_jump_insn_before (gen_jump (repeat_label), end->insn);
+	    JUMP_LABEL (newjmp) = repeat_label;
+	    delete_insn (end->insn);
+	    delete_insn (end->fallthrough);
+	  }
+      }
+    else
+      {
+	/* Case (3).  First replace all the doloop_begins with setting
+	   the HW register used for loop counter.  */
+	for (begin = loop->begin; begin != 0; begin = begin->next)
+	  {
+	    insn = gen_move_insn (copy_rtx (begin->counter),
+				  copy_rtx (begin->loop_count));
+	    emit_insn_before (insn, begin->insn);
+	    delete_insn (begin->insn);
+	  }
+
+	/* Replace all the doloop_ends with decrement-and-branch sequences.  */
+	for (end = loop->end; end != 0; end = end->next)
+	  {
+	    rtx reg;
+
+	    start_sequence ();
+
+	    /* Load the counter value into a general register.  */
+	    reg = end->counter;
+	    if (!REG_P (reg) || REGNO (reg) > LAST_NONIO_GP_REG)
+	      {
+		reg = end->scratch;
+		emit_move_insn (copy_rtx (reg), copy_rtx (end->counter));
+	      }
+
+	    /* Decrement the counter.  */
+	    emit_insn (gen_add3_insn (copy_rtx (reg), copy_rtx (reg),
+				      constm1_rtx));
+
+	    /* Copy it back to its original location.  */
+	    if (reg != end->counter)
+	      emit_move_insn (copy_rtx (end->counter), copy_rtx (reg));
+
+	    /* Jump back to the start label.  */
+	    insn = emit_jump_insn (gen_cbranchsi4 (gen_rtx_NE (VOIDmode, reg,
+							       const0_rtx),
+						   reg,
+						   const0_rtx,
+						   end->label));
+
+	    JUMP_LABEL (insn) = end->label;
+	    LABEL_NUSES (end->label)++;
+
+	    /* Emit the whole sequence before the doloop_end.  */
+	    insn = get_insns ();
+	    end_sequence ();
+	    emit_insn_before (insn, end->insn);
+
+	    /* Delete the doloop_end.  */
+	    delete_insn (end->insn);
+	  }
+      }
+}
+
+/* Implement TARGET_MACHINE_DEPENDENT_REORG.  */
+static void
+pru_reorg (void)
+{
+  rtx_insn *insns = get_insns ();
+
+  compute_bb_for_insn ();
+  df_analyze ();
+
+  /* Need correct insn lengths for allowing LOOP instruction
+     emitting due to U8_PCREL limitations.  */
+  shorten_branches (get_insns ());
+
+  /* The generic reorg_loops () is not suitable for PRU because
+     it doesn't handle doloop_begin/end tying.  And we need our
+     doloop_begin emitted before reload.  It is difficult to coalesce
+     UBYTE constant initial loop values into the LOOP insn during
+     machine reorg phase.  */
+  pru_reorg_loop (insns);
+
+  df_finish_pass (false);
+}
+
+/* Enumerate all PRU-specific builtins.  */
+enum pru_builtin
+{
+  PRU_BUILTIN_DELAY_CYCLES,
+  PRU_BUILTIN_max
+};
+
+static GTY(()) tree pru_builtins [(int) PRU_BUILTIN_max];
+
+/* Implement TARGET_INIT_BUILTINS.  */
+
+static void
+pru_init_builtins (void)
+{
+  tree void_ftype_longlong
+    = build_function_type_list (void_type_node,
+				long_long_integer_type_node,
+				NULL);
+
+  pru_builtins[PRU_BUILTIN_DELAY_CYCLES]
+    = add_builtin_function ( "__delay_cycles", void_ftype_longlong,
+			    PRU_BUILTIN_DELAY_CYCLES, BUILT_IN_MD, NULL,
+			    NULL_TREE);
+}
+
+/* Implement TARGET_BUILTIN_DECL.  */
+
+static tree
+pru_builtin_decl (unsigned code, bool initialize_p ATTRIBUTE_UNUSED)
+{
+  switch (code)
+    {
+    case PRU_BUILTIN_DELAY_CYCLES:
+      return pru_builtins[code];
+    default:
+      return error_mark_node;
+    }
+}
+
+/* Emit a sequence of one or more delay_cycles_X insns, in order to generate
+   code that delays exactly ARG cycles.  */
+
+static rtx
+pru_expand_delay_cycles (rtx arg)
+{
+  HOST_WIDE_INT c, n;
+
+  if (GET_CODE (arg) != CONST_INT)
+    {
+      error ("%<__delay_cycles%> only takes constant arguments");
+      return NULL_RTX;
+    }
+
+  c = INTVAL (arg);
+
+  if (HOST_BITS_PER_WIDE_INT > 32)
+    {
+      if (c < 0)
+	{
+	  error ("%<__delay_cycles%> only takes non-negative cycle counts");
+	  return NULL_RTX;
+	}
+    }
+
+  emit_insn (gen_delay_cycles_start (arg));
+
+  /* For 32-bit loops, there's 2 + 2x cycles.  */
+  if (c > 2 * 0xffff + 1)
+    {
+      n = (c - 2) / 2;
+      c -= (n * 2) + 2;
+      if ((unsigned long long) n > 0xffffffffULL)
+	{
+	  error ("%<__delay_cycles%> is limited to 32-bit loop counts");
+	  return NULL_RTX;
+	}
+      emit_insn (gen_delay_cycles_2x_plus2_si (GEN_INT (n)));
+    }
+
+  /* For 16-bit loops, there's 1 + 2x cycles.  */
+  if (c > 2)
+    {
+      n = (c - 1) / 2;
+      c -= (n * 2) + 1;
+
+      emit_insn (gen_delay_cycles_2x_plus1_hi (GEN_INT (n)));
+    }
+
+  while (c > 0)
+    {
+      emit_insn (gen_delay_cycles_1 ());
+      c -= 1;
+    }
+
+  emit_insn (gen_delay_cycles_end (arg));
+
+  return NULL_RTX;
+}
+
+
+/* Implement TARGET_EXPAND_BUILTIN.  Expand an expression EXP that calls
+   a built-in function, with result going to TARGET if that's convenient
+   (and in mode MODE if that's convenient).
+   SUBTARGET may be used as the target for computing one of EXP's operands.
+   IGNORE is nonzero if the value is to be ignored.  */
+
+static rtx
+pru_expand_builtin (tree exp, rtx target ATTRIBUTE_UNUSED,
+		    rtx subtarget ATTRIBUTE_UNUSED,
+		    machine_mode mode ATTRIBUTE_UNUSED,
+		    int ignore ATTRIBUTE_UNUSED)
+{
+  tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
+  unsigned int fcode = DECL_FUNCTION_CODE (fndecl);
+  rtx arg1 = expand_normal (CALL_EXPR_ARG (exp, 0));
+
+  if (fcode == PRU_BUILTIN_DELAY_CYCLES)
+    return pru_expand_delay_cycles (arg1);
+
+  internal_error ("bad builtin code");
+
+  return NULL_RTX;
+}
+
+/* Remember the last target of pru_set_current_function.  */
+static GTY(()) tree pru_previous_fndecl;
+
+/* Establish appropriate back-end context for processing the function
+   FNDECL.  The argument might be NULL to indicate processing at top
+   level, outside of any function scope.  */
+static void
+pru_set_current_function (tree fndecl)
+{
+  tree old_tree = (pru_previous_fndecl
+		   ? DECL_FUNCTION_SPECIFIC_TARGET (pru_previous_fndecl)
+		   : NULL_TREE);
+
+  tree new_tree = (fndecl
+		   ? DECL_FUNCTION_SPECIFIC_TARGET (fndecl)
+		   : NULL_TREE);
+
+  if (fndecl && fndecl != pru_previous_fndecl)
+    {
+      pru_previous_fndecl = fndecl;
+      if (old_tree == new_tree)
+	;
+
+      else if (new_tree)
+	{
+	  cl_target_option_restore (&global_options,
+				    TREE_TARGET_OPTION (new_tree));
+	  target_reinit ();
+	}
+
+      else if (old_tree)
+	{
+	  struct cl_target_option *def
+	    = TREE_TARGET_OPTION (target_option_current_node);
+
+	  cl_target_option_restore (&global_options, def);
+	  target_reinit ();
+	}
+    }
+}
+
+/* Implement TARGET_UNWIND_WORD_MODE.
+
+   Since PRU is really a 32-bit CPU, the default word_mode is not suitable.  */
+static scalar_int_mode
+pru_unwind_word_mode (void)
+{
+  return SImode;
+}
+
+
+/* Initialize the GCC target structure.  */
+#undef TARGET_ASM_FUNCTION_PROLOGUE
+#define TARGET_ASM_FUNCTION_PROLOGUE pru_asm_function_prologue
+#undef TARGET_ASM_INTEGER
+#define TARGET_ASM_INTEGER pru_assemble_integer
+
+#undef TARGET_ASM_FILE_START
+#define TARGET_ASM_FILE_START pru_file_start
+
+#undef TARGET_INIT_BUILTINS
+#define TARGET_INIT_BUILTINS pru_init_builtins
+#undef TARGET_EXPAND_BUILTIN
+#define TARGET_EXPAND_BUILTIN pru_expand_builtin
+#undef TARGET_BUILTIN_DECL
+#define TARGET_BUILTIN_DECL pru_builtin_decl
+
+#undef TARGET_FUNCTION_OK_FOR_SIBCALL
+#define TARGET_FUNCTION_OK_FOR_SIBCALL hook_bool_tree_tree_true
+
+#undef TARGET_CAN_ELIMINATE
+#define TARGET_CAN_ELIMINATE pru_can_eliminate
+
+#undef TARGET_MODES_TIEABLE_P
+#define TARGET_MODES_TIEABLE_P pru_modes_tieable_p
+
+#undef TARGET_HARD_REGNO_MODE_OK
+#define TARGET_HARD_REGNO_MODE_OK pru_hard_regno_mode_ok
+
+#undef  TARGET_HARD_REGNO_SCRATCH_OK
+#define TARGET_HARD_REGNO_SCRATCH_OK pru_hard_regno_scratch_ok
+
+#undef TARGET_FUNCTION_ARG
+#define TARGET_FUNCTION_ARG pru_function_arg
+
+#undef TARGET_FUNCTION_ARG_ADVANCE
+#define TARGET_FUNCTION_ARG_ADVANCE pru_function_arg_advance
+
+#undef TARGET_ARG_PARTIAL_BYTES
+#define TARGET_ARG_PARTIAL_BYTES pru_arg_partial_bytes
+
+#undef TARGET_FUNCTION_VALUE
+#define TARGET_FUNCTION_VALUE pru_function_value
+
+#undef TARGET_LIBCALL_VALUE
+#define TARGET_LIBCALL_VALUE pru_libcall_value
+
+#undef TARGET_FUNCTION_VALUE_REGNO_P
+#define TARGET_FUNCTION_VALUE_REGNO_P pru_function_value_regno_p
+
+#undef TARGET_RETURN_IN_MEMORY
+#define TARGET_RETURN_IN_MEMORY pru_return_in_memory
+
+#undef TARGET_MUST_PASS_IN_STACK
+#define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size
+
+#undef TARGET_LEGITIMATE_ADDRESS_P
+#define TARGET_LEGITIMATE_ADDRESS_P pru_legitimate_address_p
+
+#undef TARGET_PREFERRED_RELOAD_CLASS
+#define TARGET_PREFERRED_RELOAD_CLASS pru_preferred_reload_class
+
+#undef TARGET_INIT_LIBFUNCS
+#define TARGET_INIT_LIBFUNCS pru_init_libfuncs
+#undef TARGET_LIBFUNC_GNU_PREFIX
+#define TARGET_LIBFUNC_GNU_PREFIX true
+
+#undef TARGET_RTX_COSTS
+#define TARGET_RTX_COSTS pru_rtx_costs
+
+#undef TARGET_PRINT_OPERAND
+#define TARGET_PRINT_OPERAND pru_print_operand
+
+#undef TARGET_PRINT_OPERAND_ADDRESS
+#define TARGET_PRINT_OPERAND_ADDRESS pru_print_operand_address
+
+#undef TARGET_OPTION_OVERRIDE
+#define TARGET_OPTION_OVERRIDE pru_option_override
+
+#undef TARGET_SET_CURRENT_FUNCTION
+#define TARGET_SET_CURRENT_FUNCTION pru_set_current_function
+
+#undef  TARGET_MACHINE_DEPENDENT_REORG
+#define TARGET_MACHINE_DEPENDENT_REORG  pru_reorg
+
+#undef  TARGET_CAN_USE_DOLOOP_P
+#define TARGET_CAN_USE_DOLOOP_P		pru_can_use_doloop_p
+
+#undef TARGET_INVALID_WITHIN_DOLOOP
+#define TARGET_INVALID_WITHIN_DOLOOP  pru_invalid_within_doloop
+
+#undef  TARGET_UNWIND_WORD_MODE
+#define TARGET_UNWIND_WORD_MODE pru_unwind_word_mode
+
+struct gcc_target targetm = TARGET_INITIALIZER;
+
+#include "gt-pru.h"
diff --git a/gcc/config/pru/pru.h b/gcc/config/pru/pru.h
new file mode 100644
index 00000000000..de1b9100209
--- /dev/null
+++ b/gcc/config/pru/pru.h
@@ -0,0 +1,551 @@
+/* Definitions of target machine for TI PRU.
+   Copyright (C) 2014-2018 Free Software Foundation, Inc.
+   Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_PRU_H
+#define GCC_PRU_H
+
+#include "config/pru/pru-opts.h"
+
+/* Define built-in preprocessor macros.  */
+#define TARGET_CPU_CPP_BUILTINS()		    \
+  do						    \
+    {						    \
+      builtin_define_std ("__PRU__");		    \
+      builtin_define_std ("__pru__");		    \
+      builtin_define_std ("__PRU_V3__");	    \
+      builtin_define_std ("__LITTLE_ENDIAN__");	    \
+      builtin_define_std ("__little_endian__");	    \
+      /* Trampolines are disabled for now.  */	    \
+      builtin_define_std ("NO_TRAMPOLINES");	    \
+    }						    \
+  while (0)
+
+/* TI ABI implementation is not feature enough (e.g. function pointers are
+   not supported), so we cannot list it as a multilib variant.  To prevent
+   misuse from users, do not link any of the standard libraries.  */
+#define DRIVER_SELF_SPECS			      \
+  "%{mabi=ti:-nodefaultlibs} "			      \
+  "%{mmcu=*:-specs=device-specs/%*%s %<mmcu=*} "
+
+#undef CPP_SPEC
+#define CPP_SPEC					\
+  "%(cpp_device) "					\
+  "%{mabi=ti:-D__PRU_EABI_TI__; :-D__PRU_EABI_GNU__}"
+
+/* Do not relax when in TI ABI mode since TI tools do not always
+   put PRU_S10_PCREL.  */
+#undef  LINK_SPEC
+#define LINK_SPEC					    \
+  "%(link_device) "					    \
+  "%{mabi=ti:--no-relax;:%{mno-relax:--no-relax;:--relax}} "   \
+  "%{shared:%eshared is not supported} "
+
+/* CRT0 is carefully maintained to be compatible with both GNU and TI ABIs.  */
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC							\
+  "%{!pg:%{minrt:crt0-minrt.o%s}%{!minrt:crt0.o%s}} %{!mabi=ti:-lgcc} "
+
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC "%{!mabi=ti:-lgloss} "
+
+/* TI ABI mandates that ELF symbols do not start with any prefix.  */
+#undef USER_LABEL_PREFIX
+#define USER_LABEL_PREFIX ""
+
+#undef LOCAL_LABEL_PREFIX
+#define LOCAL_LABEL_PREFIX ".L"
+
+/* Storage layout.  */
+
+#define DEFAULT_SIGNED_CHAR 0
+#define BITS_BIG_ENDIAN 0
+#define BYTES_BIG_ENDIAN 0
+#define WORDS_BIG_ENDIAN 0
+
+/* PRU is represented in GCC as an 8-bit CPU with fast 16b and 32bb
+   arithmetic.  */
+#define BITS_PER_WORD 8
+
+#ifdef IN_LIBGCC2
+/* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
+#define UNITS_PER_WORD 4
+#else
+/* Width of a word, in units (bytes).  */
+#define UNITS_PER_WORD 1
+#endif
+
+#define POINTER_SIZE 32
+#define BIGGEST_ALIGNMENT 8
+#define STRICT_ALIGNMENT 0
+#define FUNCTION_BOUNDARY 8	/* Func pointers are word-addressed.  */
+#define PARM_BOUNDARY 8
+#define STACK_BOUNDARY 8
+#define MAX_FIXED_MODE_SIZE 64
+
+#define POINTERS_EXTEND_UNSIGNED 1
+
+/* Layout of source language data types.  */
+
+#define INT_TYPE_SIZE 32
+#define SHORT_TYPE_SIZE 16
+#define LONG_TYPE_SIZE 32
+#define LONG_LONG_TYPE_SIZE 64
+#define FLOAT_TYPE_SIZE 32
+#define DOUBLE_TYPE_SIZE 64
+#define LONG_DOUBLE_TYPE_SIZE DOUBLE_TYPE_SIZE
+
+#undef SIZE_TYPE
+#define SIZE_TYPE "unsigned int"
+
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "int"
+
+
+/* Basic characteristics of PRU registers:
+
+   Regno  Name
+   0      r0		  Caller Saved.  Also used as a static chain register.
+   1      r1		  Caller Saved.  Also used as a temporary by function
+			  profiler and function prologue/epilogue.
+   2      r2       sp	  Stack Pointer
+   3*     r3.w0    ra	  Return Address (16-bit)
+   4      r4       fp	  Frame Pointer
+   5-13   r5-r13	  Callee Saved Registers
+   14-29  r14-r29	  Register Arguments.  Caller Saved Registers.
+   14-15  r14-r15	  Return Location
+   30     r30		  Special I/O register.  Not used by compiler.
+   31     r31		  Special I/O register.  Not used by compiler.
+
+   32     loop_cntr	  Internal register used as a counter by LOOP insns
+
+   33     pc		  Not an actual register
+
+   34     fake_fp	  Fake Frame Pointer (always eliminated)
+   35     fake_ap	  Fake Argument Pointer (always eliminated)
+   36			  First Pseudo Register
+
+   The definitions for all the hard register numbers are located in pru.md.
+*/
+
+#define FIXED_REGISTERS				\
+  {						\
+/*   0 */  0,0,0,0, 0,0,0,0, 1,1,1,1, 1,1,1,1,	\
+/*   4 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*   8 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  12 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  16 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  20 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  24 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  28 */  0,0,0,0, 0,0,0,0, 1,1,1,1, 1,1,1,1,	\
+/*  32 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1	\
+  }
+
+/* Call used == caller saved + fixed regs + args + ret vals.  */
+#define CALL_USED_REGISTERS			\
+  {						\
+/*   0 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,	\
+/*   4 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*   8 */  0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,	\
+/*  12 */  0,0,0,0, 0,0,0,0, 1,1,1,1, 1,1,1,1,	\
+/*  16 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,	\
+/*  20 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,	\
+/*  24 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,	\
+/*  28 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,	\
+/*  32 */  1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1	\
+  }
+
+#define __pru_RSEQ(X)  (X) * 4 + 0, (X) * 4 + 1, (X) * 4 + 2, (X) * 4 + 3
+#define REG_ALLOC_ORDER							    \
+  {									    \
+    /* Call-clobbered, yet not used for parameters.  */			    \
+    __pru_RSEQ (0),  __pru_RSEQ ( 1),					    \
+									    \
+    __pru_RSEQ (14), __pru_RSEQ (15), __pru_RSEQ (16), __pru_RSEQ (17),	    \
+    __pru_RSEQ (18), __pru_RSEQ (19), __pru_RSEQ (20), __pru_RSEQ (21),	    \
+    __pru_RSEQ (22), __pru_RSEQ (23), __pru_RSEQ (24), __pru_RSEQ (25),	    \
+    __pru_RSEQ (26), __pru_RSEQ (27), __pru_RSEQ (28), __pru_RSEQ (29),	    \
+									    \
+    __pru_RSEQ ( 5), __pru_RSEQ ( 6), __pru_RSEQ ( 7), __pru_RSEQ ( 8),	    \
+    __pru_RSEQ ( 9), __pru_RSEQ (10), __pru_RSEQ (11), __pru_RSEQ (12),	    \
+    __pru_RSEQ (13),							    \
+									    \
+    __pru_RSEQ ( 4),							    \
+    __pru_RSEQ ( 2), __pru_RSEQ ( 3),					    \
+									    \
+    /* I/O and virtual registers.  */					    \
+    __pru_RSEQ (30), __pru_RSEQ (31), __pru_RSEQ (32), __pru_RSEQ (33),	    \
+    __pru_RSEQ (34), __pru_RSEQ (35)					    \
+  }
+
+/* Register Classes.  */
+
+enum reg_class
+{
+  NO_REGS,
+  SIB_REGS,
+  LOOPCNTR_REGS,
+  GP_REGS,
+  ALL_REGS,
+  LIM_REG_CLASSES
+};
+
+#define N_REG_CLASSES (int) LIM_REG_CLASSES
+
+#define REG_CLASS_NAMES   \
+  {  "NO_REGS",		  \
+     "SIB_REGS",	  \
+     "LOOPCNTR_REGS",	  \
+     "GP_REGS",		  \
+     "ALL_REGS" }
+
+#define GENERAL_REGS ALL_REGS
+
+#define REG_CLASS_CONTENTS					\
+  {								\
+    /* NO_REGS	      */ { 0, 0, 0, 0, 0},			\
+    /* SIB_REGS	      */ { 0xf, 0xff000000, ~0, 0xffffff, 0},	\
+    /* LOOPCNTR_REGS  */ { 0, 0, 0, 0, 0xf},			\
+    /* GP_REGS	      */ { ~0, ~0, ~0, ~0, 0},			\
+    /* ALL_REGS	      */ { ~0,~0, ~0, ~0, ~0}			\
+  }
+
+
+#define GP_REG_P(REGNO) ((unsigned)(REGNO) <= LAST_GP_REG)
+#define REGNO_REG_CLASS(REGNO)						    \
+	((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO ? SIB_REGS \
+	 : (REGNO) == STATIC_CHAIN_REGNUM ? SIB_REGS			    \
+	 : (REGNO) == LOOPCNTR_REG ? LOOPCNTR_REGS			    \
+	 : (REGNO) <= LAST_NONIO_GP_REG ? GP_REGS			    \
+	 : ALL_REGS)
+
+#define CLASS_MAX_NREGS(CLASS, MODE) \
+  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
+
+/* Arbitrarily set to a non-argument register.  Not defined by TI ABI.  */
+#define STATIC_CHAIN_REGNUM      0	/* r0 */
+
+/* Tests for various kinds of constants used in the PRU port.  */
+#define SHIFT_INT(X) ((X) >= 0 && (X) <= 31)
+
+#define UHWORD_INT(X) (IN_RANGE ((X), 0, 0xffff))
+#define SHWORD_INT(X) (IN_RANGE ((X), -32768, 32767))
+#define UBYTE_INT(X) (IN_RANGE ((X), 0, 0xff))
+
+/* Say that the epilogue uses the return address register.  Note that
+   in the case of sibcalls, the values "used by the epilogue" are
+   considered live at the start of the called function.  */
+#define EPILOGUE_USES(REGNO) (epilogue_completed &&	      \
+			      (((REGNO) == RA_REGNO)	      \
+			       || (REGNO) == (RA_REGNO + 1)))
+
+/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
+   the stack pointer does not matter.  The value is tested only in
+   functions that have frame pointers.
+   No definition is equivalent to always zero.  */
+
+#define EXIT_IGNORE_STACK 1
+
+/* Trampolines are not supported, but put a define to keep the build.  */
+#define TRAMPOLINE_SIZE 4
+
+/* Stack layout.  */
+#define STACK_GROWS_DOWNWARD  1
+#undef FRAME_GROWS_DOWNWARD
+#define FIRST_PARM_OFFSET(FUNDECL) 0
+
+/* Before the prologue, RA lives in r3.w2.  */
+#define INCOMING_RETURN_ADDR_RTX	gen_rtx_REG (HImode, RA_REGNO)
+
+#define RETURN_ADDR_RTX(C,F) pru_get_return_address (C)
+
+#define DWARF_FRAME_RETURN_COLUMN RA_REGNO
+
+/* The CFA includes the pretend args.  */
+#define ARG_POINTER_CFA_OFFSET(FNDECL) \
+  (gcc_assert ((FNDECL) == current_function_decl), \
+   FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
+
+/* Frame/arg pointer elimination settings.  */
+#define ELIMINABLE_REGS							\
+{{ ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},				\
+ { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM},			\
+ { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},				\
+ { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
+
+#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
+  (OFFSET) = pru_initial_elimination_offset ((FROM), (TO))
+
+#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
+  pru_hard_regno_rename_ok (OLD_REG, NEW_REG)
+
+/* Calling convention definitions.  */
+#if !defined(IN_LIBGCC2)
+
+#define NUM_ARG_REGS (LAST_ARG_REGNO - FIRST_ARG_REGNO + 1)
+
+typedef struct pru_args
+{
+  bool regs_used[NUM_ARG_REGS];
+} CUMULATIVE_ARGS;
+
+#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS)  \
+  do {									  \
+      memset ((CUM).regs_used, 0, sizeof ((CUM).regs_used));		  \
+  } while (0)
+
+#define FUNCTION_ARG_REGNO_P(REGNO) \
+  ((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO)
+
+/* Passing function arguments on stack.  */
+#define PUSH_ARGS 0
+#define ACCUMULATE_OUTGOING_ARGS 1
+
+/* We define TARGET_RETURN_IN_MEMORY, so set to zero.  */
+#define DEFAULT_PCC_STRUCT_RETURN 0
+
+/* Profiling.  */
+#define PROFILE_BEFORE_PROLOGUE
+#define NO_PROFILE_COUNTERS 1
+#define FUNCTION_PROFILER(FILE, LABELNO) \
+  pru_function_profiler ((FILE), (LABELNO))
+
+#endif	/* IN_LIBGCC2 */
+
+/* Addressing modes.  */
+
+#define CONSTANT_ADDRESS_P(X) \
+  (CONSTANT_P (X) && memory_address_p (SImode, X))
+
+#define MAX_REGS_PER_ADDRESS 2
+#define BASE_REG_CLASS ALL_REGS
+#define INDEX_REG_CLASS ALL_REGS
+
+#define REGNO_OK_FOR_BASE_P(REGNO) pru_regno_ok_for_base_p ((REGNO), true)
+#define REGNO_OK_FOR_INDEX_P(REGNO) pru_regno_ok_for_index_p ((REGNO), true)
+
+/* Limited by the insns in pru-ldst-multiple.md.  */
+#define MOVE_MAX 8
+#define SLOW_BYTE_ACCESS 1
+
+/* It is as good to call a constant function address as to call an address
+   kept in a register.  */
+#define NO_FUNCTION_CSE 1
+
+/* Define output assembler language.  */
+
+#define ASM_APP_ON "#APP\n"
+#define ASM_APP_OFF "#NO_APP\n"
+
+#define ASM_COMMENT_START "# "
+
+#define GLOBAL_ASM_OP "\t.global\t"
+
+#define __pru_name_R(X)  X".b0", X".b1", X".b2", X".b3"
+#define REGISTER_NAMES		  \
+  {				  \
+    __pru_name_R ("r0"),	  \
+    __pru_name_R ("r1"),	  \
+    __pru_name_R ("r2"),	  \
+    __pru_name_R ("r3"),	  \
+    __pru_name_R ("r4"),	  \
+    __pru_name_R ("r5"),	  \
+    __pru_name_R ("r6"),	  \
+    __pru_name_R ("r7"),	  \
+    __pru_name_R ("r8"),	  \
+    __pru_name_R ("r9"),	  \
+    __pru_name_R ("r10"),	  \
+    __pru_name_R ("r11"),	  \
+    __pru_name_R ("r12"),	  \
+    __pru_name_R ("r13"),	  \
+    __pru_name_R ("r14"),	  \
+    __pru_name_R ("r15"),	  \
+    __pru_name_R ("r16"),	  \
+    __pru_name_R ("r17"),	  \
+    __pru_name_R ("r18"),	  \
+    __pru_name_R ("r19"),	  \
+    __pru_name_R ("r20"),	  \
+    __pru_name_R ("r21"),	  \
+    __pru_name_R ("r22"),	  \
+    __pru_name_R ("r23"),	  \
+    __pru_name_R ("r24"),	  \
+    __pru_name_R ("r25"),	  \
+    __pru_name_R ("r26"),	  \
+    __pru_name_R ("r27"),	  \
+    __pru_name_R ("r28"),	  \
+    __pru_name_R ("r29"),	  \
+    __pru_name_R ("r30"),	  \
+    __pru_name_R ("r31"),	  \
+    __pru_name_R ("loopcntr_reg"), \
+    __pru_name_R ("pc"),	  \
+    __pru_name_R ("fake_fp"),	  \
+    __pru_name_R ("fake_ap"),	  \
+}
+
+#define __pru_overlap_R(X)	      \
+  { "r" #X	, X * 4	    ,  4 },   \
+  { "r" #X ".w0", X * 4 + 0 ,  2 },   \
+  { "r" #X ".w1", X * 4 + 1 ,  2 },   \
+  { "r" #X ".w2", X * 4 + 2 ,  2 }
+
+#define OVERLAPPING_REGISTER_NAMES  \
+  {				    \
+    /* Aliases.  */		    \
+    { "sp", 2 * 4, 4 },		    \
+    { "ra", 3 * 4, 2 },		    \
+    { "fp", 4 * 4, 4 },		    \
+    __pru_overlap_R (0),	    \
+    __pru_overlap_R (1),	    \
+    __pru_overlap_R (2),	    \
+    __pru_overlap_R (3),	    \
+    __pru_overlap_R (4),	    \
+    __pru_overlap_R (5),	    \
+    __pru_overlap_R (6),	    \
+    __pru_overlap_R (7),	    \
+    __pru_overlap_R (8),	    \
+    __pru_overlap_R (9),	    \
+    __pru_overlap_R (10),	    \
+    __pru_overlap_R (11),	    \
+    __pru_overlap_R (12),	    \
+    __pru_overlap_R (13),	    \
+    __pru_overlap_R (14),	    \
+    __pru_overlap_R (15),	    \
+    __pru_overlap_R (16),	    \
+    __pru_overlap_R (17),	    \
+    __pru_overlap_R (18),	    \
+    __pru_overlap_R (19),	    \
+    __pru_overlap_R (20),	    \
+    __pru_overlap_R (21),	    \
+    __pru_overlap_R (22),	    \
+    __pru_overlap_R (23),	    \
+    __pru_overlap_R (24),	    \
+    __pru_overlap_R (25),	    \
+    __pru_overlap_R (26),	    \
+    __pru_overlap_R (27),	    \
+    __pru_overlap_R (28),	    \
+    __pru_overlap_R (29),	    \
+    __pru_overlap_R (30),	    \
+    __pru_overlap_R (31),	    \
+}
+
+#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)				    \
+  do									    \
+    {									    \
+      fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE);    \
+      fprintf (FILE, "%%pmem(.L%u)\n", (unsigned) (VALUE));		    \
+    }									    \
+  while (0)
+
+#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)		    \
+  do									    \
+    {									    \
+      fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), STREAM);  \
+      fprintf (STREAM, "%%pmem(.L%u-.L%u)\n", (unsigned) (VALUE),	    \
+	       (unsigned) (REL));					    \
+    }									    \
+  while (0)
+
+/* Section directives.  */
+
+/* Output before read-only data.  */
+#define TEXT_SECTION_ASM_OP "\t.section\t.text"
+
+/* Output before writable data.  */
+#define DATA_SECTION_ASM_OP "\t.section\t.data"
+
+/* Output before uninitialized data.  */
+#define BSS_SECTION_ASM_OP "\t.section\t.bss"
+
+#define CTORS_SECTION_ASM_OP "\t.section\t.init_array,\"aw\",%init_array"
+#define DTORS_SECTION_ASM_OP "\t.section\t.fini_array,\"aw\",%fini_array"
+
+#undef INIT_SECTION_ASM_OP
+#undef FINI_SECTION_ASM_OP
+#define INIT_ARRAY_SECTION_ASM_OP CTORS_SECTION_ASM_OP
+#define FINI_ARRAY_SECTION_ASM_OP DTORS_SECTION_ASM_OP
+
+/* Since we use .init_array/.fini_array we don't need the markers at
+   the start and end of the ctors/dtors arrays.  */
+#define CTOR_LIST_BEGIN asm (CTORS_SECTION_ASM_OP)
+#define CTOR_LIST_END		/* empty */
+#define DTOR_LIST_BEGIN asm (DTORS_SECTION_ASM_OP)
+#define DTOR_LIST_END		/* empty */
+
+#undef TARGET_ASM_CONSTRUCTOR
+#define TARGET_ASM_CONSTRUCTOR pru_elf_asm_constructor
+
+#undef TARGET_ASM_DESTRUCTOR
+#define TARGET_ASM_DESTRUCTOR pru_elf_asm_destructor
+
+#define ASM_OUTPUT_ALIGN(FILE, LOG)		      \
+  do {						      \
+    fprintf ((FILE), "%s%d\n", ALIGN_ASM_OP, (LOG));  \
+  } while (0)
+
+#undef  ASM_OUTPUT_ALIGNED_COMMON
+#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)		\
+do									\
+  {									\
+    fprintf ((FILE), "%s", COMMON_ASM_OP);				\
+    assemble_name ((FILE), (NAME));					\
+    fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE),	\
+	     (ALIGN) / BITS_PER_UNIT);					\
+  }									\
+while (0)
+
+
+/* This says how to output assembler code to declare an
+   uninitialized internal linkage data object.  Under SVR4,
+   the linker seems to want the alignment of data objects
+   to depend on their types.  We do exactly that here.  */
+
+#undef  ASM_OUTPUT_ALIGNED_LOCAL
+#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)		\
+do {									\
+  switch_to_section (bss_section);					\
+  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");			\
+  if (!flag_inhibit_size_directive)					\
+    ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);			\
+  ASM_OUTPUT_ALIGN ((FILE), exact_log2 ((ALIGN) / BITS_PER_UNIT));      \
+  ASM_OUTPUT_LABEL (FILE, NAME);					\
+  ASM_OUTPUT_SKIP ((FILE), (SIZE) ? (SIZE) : 1);			\
+} while (0)
+
+/* Misc parameters.  */
+
+#define STORE_FLAG_VALUE 1
+#define Pmode SImode
+#define FUNCTION_MODE Pmode
+
+#define CASE_VECTOR_MODE Pmode
+
+/* Jumps are cheap on PRU.  */
+#define LOGICAL_OP_NON_SHORT_CIRCUIT		0
+
+/* Unfortunately the LBBO instruction does not zero-extend data.  */
+#undef LOAD_EXTEND_OP
+
+#undef WORD_REGISTER_OPERATIONS
+
+#define HAS_LONG_UNCOND_BRANCH			1
+#define HAS_LONG_COND_BRANCH			1
+
+#define REGISTER_TARGET_PRAGMAS() pru_register_pragmas ()
+
+#endif /* GCC_PRU_H */
diff --git a/gcc/config/pru/pru.md b/gcc/config/pru/pru.md
new file mode 100644
index 00000000000..4be1958e6c9
--- /dev/null
+++ b/gcc/config/pru/pru.md
@@ -0,0 +1,956 @@
+;; Machine Description for TI PRU.
+;; Copyright (C) 2014-2018 Free Software Foundation, Inc.
+;; Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+;; Based on the NIOS2 GCC port.
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+;; Register numbers.
+(define_constants
+  [
+   (FIRST_ARG_REGNO	    56)	; Argument registers.
+   (LAST_ARG_REGNO	    119)	;
+   (FIRST_RETVAL_REGNO	    56)	; Return value registers.
+   (LAST_RETVAL_REGNO	    60)	;
+   (PROLOGUE_TEMP_REGNO	    4)	; Temporary register to use in prologue.
+
+   (RA_REGNO		    14)	; Return address register r3.w2.
+   (FP_REGNO		    16)	; Frame pointer register.
+   (LAST_NONIO_GP_REG	    119)	; Last non-I/O general purpose register.
+   (LOOPCNTR_REG	    128)	; internal LOOP counter register
+   (LAST_GP_REG		    132)	; Last general purpose register.
+
+   ;; Target register definitions.
+   (STACK_POINTER_REGNUM	8)
+   (HARD_FRAME_POINTER_REGNUM	FP_REGNO)
+   (PC_REGNUM			132)
+   (FRAME_POINTER_REGNUM	136)
+   (ARG_POINTER_REGNUM		140)
+   (FIRST_PSEUDO_REGISTER	144)
+  ]
+)
+
+;; Enumeration of UNSPECs.
+
+(define_c_enum "unspecv" [
+  UNSPECV_DELAY_CYCLES_START
+  UNSPECV_DELAY_CYCLES_END
+  UNSPECV_DELAY_CYCLES_2X_HI
+  UNSPECV_DELAY_CYCLES_2X_SI
+  UNSPECV_DELAY_CYCLES_1
+
+  UNSPECV_LOOP_BEGIN
+  UNSPECV_LOOP_END
+
+  UNSPECV_BLOCKAGE
+])
+
+; Length of an instruction (in bytes).
+(define_attr "length" "" (const_int 4))
+(define_attr "type"
+  "unknown,complex,control,alu,cond_alu,st,ld,shift"
+  (const_string "complex"))
+
+(define_asm_attributes
+ [(set_attr "length" "4")
+  (set_attr "type" "complex")])
+
+; There is no pipeline, so our scheduling description is simple.
+(define_automaton "pru")
+(define_cpu_unit "cpu" "pru")
+
+(define_insn_reservation "everything" 1 (match_test "true") "cpu")
+
+(include "predicates.md")
+(include "constraints.md")
+
+;; All supported direct move-modes
+(define_mode_iterator MOVMODE [QI QQ UQQ
+			       HI HQ UHQ HA UHA
+			       SI SQ USQ SA USA
+			       SF])
+
+(define_mode_iterator MOV32 [SI SF SD SQ USQ])
+(define_mode_iterator MOV64 [DI DF DD DQ UDQ])
+(define_mode_iterator QISI [QI HI SI])
+(define_mode_iterator HISI [HI SI])
+(define_mode_iterator QIHI [QI HI])
+(define_mode_iterator SFDF [SF DF])
+
+;; EQS0/0 for extension source 0/1 and EQD for extension destination patterns.
+(define_mode_iterator EQS0 [QI HI SI])
+(define_mode_iterator EQS1 [QI HI SI])
+(define_mode_iterator EQD [QI HI SI])
+
+; Not recommended.  Please use %0 instead!
+(define_mode_attr regwidth [(QI ".b0") (HI ".w0") (SI "")])
+
+;; Move instructions
+
+(define_expand "mov<mode>"
+  [(set (match_operand:MOVMODE 0 "nonimmediate_operand" "")
+	(match_operand:MOVMODE 1 "general_operand"       ""))]
+  ""
+  "
+  {
+    /* It helps to split constant loading and memory access
+       early, so that the LDI/LDI32 instructions can be hoisted
+       outside a loop body.  */
+    if (MEM_P (operands[0]))
+      operands[1] = force_reg (<MODE>mode, operands[1]);
+  }
+  "
+)
+
+;; Leave mem and reg operands in the same insn.  Otherwise LRA gets
+;; confused, and gcc.target/pru/pr64366.c triggers infinite loops in reload.
+(define_insn "prumov<mode>"
+  [(set (match_operand:MOVMODE 0 "nonimmediate_operand" "=m,r,r")
+	(match_operand:MOVMODE 1 "nonimmediate_operand" "r,m,r"))]
+  ""
+  "@
+    sb%B0o\\t%b1, %0, %S0
+    lb%B1o\\t%b0, %1, %S1
+    mov\\t%0, %1"
+  [(set_attr "type" "st,ld,alu")
+   (set_attr "length" "4,4,4")])
+
+
+;; Split loading of integer constants into a distinct pattern, in order to
+;; prevent CSE from considering "SET (MEM, CONST_INT)" as a valid insn
+;; selection.  This fixes an abnormally long compile time exposed by
+;; gcc.dg/pr48141.c
+;;
+;; Note: Assume that Program Mem (T constraint) can fit in 16 bits!
+(define_insn "prumov_ldi<mode>"
+  [(set (match_operand:QIHI 0 "register_operand"	"=r,r,r")
+	(match_operand:VOID 1 "immediate_operand"       "T,J,N"))]
+  ""
+  "@
+    ldi\\t%0, %%pmem(%1)
+    ldi\\t%0, %1
+    ldi\\t%0, (%1) & 0xffff"
+  [(set_attr "type" "alu,alu,alu")
+   (set_attr "length" "4,4,4")])
+
+(define_insn "prumov_ldisisf<mode>"
+  [(set (match_operand:MOV32 0 "register_operand"	 "=r,r,r")
+	(match_operand:MOV32 1 "immediate_operand"       "T,J,iF"))]
+  ""
+  "@
+    ldi\\t%F0, %%pmem(%1)
+    ldi\\t%F0, %1
+    ldi32\\t%F0, %1"
+  [(set_attr "type" "alu,alu,alu")
+   (set_attr "length" "4,4,8")])
+
+; I cannot think of any reason for the core to pass a 64-bit symbolic
+; constants.  Hence simplify the rule and handle only numeric constants.
+;
+; Note: Unlike the arithmetics, here we cannot use "&" output modifier.
+; GCC expects to be able to move registers around "no matter what".
+; Forcing DI reg alignment (akin to microblaze's HARD_REGNO_MODE_OK)
+; does not seem efficient, and will violate TI ABI.
+(define_insn "mov<mode>"
+  [(set (match_operand:MOV64 0 "nonimmediate_operand" "=m,r,r,r,r,r")
+	(match_operand:MOV64 1 "general_operand"       "r,m,r,T,J,nF"))]
+  ""
+  {
+    switch (which_alternative)
+    {
+      case 0:
+	return "sb%B0o\\t%b1, %0, %S0";
+      case 1:
+	return "lb%B1o\\t%b0, %1, %S1";
+      case 2:
+	/* careful with overlapping source and destination regs.  */
+	gcc_assert (GP_REG_P (REGNO (operands[0])));
+	gcc_assert (GP_REG_P (REGNO (operands[1])));
+	if (REGNO (operands[0]) == (REGNO (operands[1]) + 4))
+	  return "mov\\t%N0, %N1\;mov\\t%F0, %F1";
+	else
+	  return "mov\\t%F0, %F1\;mov\\t%N0, %N1";
+      case 3:
+	return "ldi\\t%F0, %%pmem(%1)\;ldi\\t%N0, 0";
+      case 4:
+	return "ldi\\t%F0, %1\;ldi\\t%N0, 0";
+      case 5:
+	return "ldi32\\t%F0, %w1\;"
+	       "ldi32\\t%N0, %W1";
+      default:
+	gcc_unreachable ();
+    }
+  }
+  [(set_attr "type" "st,ld,alu,alu,alu,alu")
+   (set_attr "length" "4,4,8,8,8,16")])
+
+;
+; load_multiple pattern(s).
+;
+; ??? Due to reload problems with replacing registers inside match_parallel
+; we currently support load_multiple/store_multiple only after reload.
+;
+; Idea taken from the s390 port.
+
+(define_expand "load_multiple"
+  [(match_par_dup 3 [(set (match_operand 0 "" "")
+			  (match_operand 1 "" ""))
+		     (use (match_operand 2 "" ""))])]
+  "reload_completed"
+{
+  machine_mode mode;
+  int regno;
+  int count;
+  rtx from;
+  int i, off;
+
+  /* Support only loading a constant number of fixed-point registers from
+     memory.  */
+  if (GET_CODE (operands[2]) != CONST_INT
+      || GET_CODE (operands[1]) != MEM
+      || GET_CODE (operands[0]) != REG)
+    FAIL;
+
+  count = INTVAL (operands[2]);
+  regno = REGNO (operands[0]);
+  mode = GET_MODE (operands[0]);
+  if (mode != QImode)
+    FAIL;
+
+  operands[3] = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
+  if (!can_create_pseudo_p ())
+    {
+      if (GET_CODE (XEXP (operands[1], 0)) == REG)
+	{
+	  from = XEXP (operands[1], 0);
+	  off = 0;
+	}
+      else if (GET_CODE (XEXP (operands[1], 0)) == PLUS
+	       && GET_CODE (XEXP (XEXP (operands[1], 0), 0)) == REG
+	       && GET_CODE (XEXP (XEXP (operands[1], 0), 1)) == CONST_INT)
+	{
+	  from = XEXP (XEXP (operands[1], 0), 0);
+	  off = INTVAL (XEXP (XEXP (operands[1], 0), 1));
+	}
+      else
+	FAIL;
+    }
+  else
+    {
+      from = force_reg (Pmode, XEXP (operands[1], 0));
+      off = 0;
+    }
+
+  for (i = 0; i < count; i++)
+    XVECEXP (operands[3], 0, i)
+      = gen_rtx_SET (gen_rtx_REG (mode, regno + i),
+		     change_address (operands[1], mode,
+		       plus_constant (Pmode, from,
+				      off + i * GET_MODE_SIZE (mode))));
+})
+
+(define_insn "*pru_load_multiple"
+  [(match_parallel 0 "load_multiple_operation"
+		   [(set (match_operand:QI 1 "register_operand" "=r")
+			 (match_operand:QI 2 "memory_operand" "m"))])]
+  "reload_completed"
+{
+  int nregs = XVECLEN (operands[0], 0);
+  operands[0] = GEN_INT (nregs);
+  return "lb%B2o\\t%b1, %2, %0";
+}
+  [(set_attr "type" "ld")
+   (set_attr "length" "4")])
+
+;
+; store multiple pattern(s).
+;
+
+(define_expand "store_multiple"
+  [(match_par_dup 3 [(set (match_operand 0 "" "")
+			  (match_operand 1 "" ""))
+		     (use (match_operand 2 "" ""))])]
+  "reload_completed"
+{
+  machine_mode mode;
+  int regno;
+  int count;
+  rtx to;
+  int i, off;
+
+  /* Support only storing a constant number of fixed-point registers to
+     memory.  */
+  if (GET_CODE (operands[2]) != CONST_INT
+      || GET_CODE (operands[0]) != MEM
+      || GET_CODE (operands[1]) != REG)
+    FAIL;
+
+  count = INTVAL (operands[2]);
+  regno = REGNO (operands[1]);
+  mode = GET_MODE (operands[1]);
+  if (mode != QImode)
+    FAIL;
+
+  operands[3] = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
+
+  if (!can_create_pseudo_p ())
+    {
+      if (GET_CODE (XEXP (operands[0], 0)) == REG)
+	{
+	  to = XEXP (operands[0], 0);
+	  off = 0;
+	}
+      else if (GET_CODE (XEXP (operands[0], 0)) == PLUS
+	       && GET_CODE (XEXP (XEXP (operands[0], 0), 0)) == REG
+	       && GET_CODE (XEXP (XEXP (operands[0], 0), 1)) == CONST_INT)
+	{
+	  to = XEXP (XEXP (operands[0], 0), 0);
+	  off = INTVAL (XEXP (XEXP (operands[0], 0), 1));
+	}
+      else
+	FAIL;
+    }
+  else
+    {
+      to = force_reg (Pmode, XEXP (operands[0], 0));
+      off = 0;
+    }
+
+  for (i = 0; i < count; i++)
+    XVECEXP (operands[3], 0, i)
+      = gen_rtx_SET (change_address (operands[0], mode,
+		       plus_constant (Pmode, to,
+				      off + i * GET_MODE_SIZE (mode))),
+		     gen_rtx_REG (mode, regno + i));
+})
+
+(define_insn "*pru_store_multiple"
+  [(match_parallel 0 "store_multiple_operation"
+		   [(set (match_operand:QI 1 "memory_operand" "=m")
+			 (match_operand:QI 2 "register_operand" "r"))])]
+  "reload_completed"
+{
+  int nregs = XVECLEN (operands[0], 0);
+  operands[0] = GEN_INT (nregs);
+  return "sb%B1o\\t%b2, %1, %0";
+}
+  [(set_attr "type" "st")
+   (set_attr "length" "4")])
+
+;; Zero extension patterns
+;;
+;; Unfortunately we cannot use lbbo to load AND zero-extent a value.
+;; The burst length parameter of the LBBO instruction designates not only
+;; the number of memory data bytes fetched, but also the number of register
+;; byte fields written.
+(define_expand "zero_extend<EQS0:mode><EQD:mode>2"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(zero_extend:EQD (match_operand:EQS0 1 "register_operand" "r")))]
+  ""
+  ""
+  [(set_attr "type"     "alu")])
+
+(define_insn "*zero_extend<EQS0:mode><EQD:mode>2"
+  [(set (match_operand:EQD 0 "register_operand" "=r")
+	(zero_extend:EQD (match_operand:EQS0 1 "register_operand" "r")))]
+  ""
+  "mov\\t%0, %1"
+  [(set_attr "type"     "alu")])
+
+;; Sign extension patterns.  We have to emulate them due to lack of
+;; signed operations in PRU's ALU.
+
+(define_insn "extend<EQS0:mode><EQD:mode>2"
+  [(set (match_operand:EQD 0 "register_operand"			  "=r")
+	(sign_extend:EQD (match_operand:EQS0 1 "register_operand"  "r")))]
+  ""
+  {
+    return pru_output_sign_extend (operands);
+  }
+  [(set_attr "type" "complex")
+   (set_attr "length" "12")])
+
+;; Bit extraction
+;; We define it solely to allow combine to choose SImode
+;; for word mode when trying to match our cbranch_qbbx_* insn.
+;;
+;; Check how combine.c:make_extraction() uses
+;; get_best_reg_extraction_insn() to select the op size.
+(define_insn "extzv<mode>"
+  [(set (match_operand:QISI 0 "register_operand"	"=r")
+	  (zero_extract:QISI
+	   (match_operand:QISI 1 "register_operand"	"r")
+	   (match_operand:QISI 2 "const_int_operand"	"i")
+	   (match_operand:QISI 3 "const_int_operand"	"i")))]
+  ""
+  "lsl\\t%0, %1, (%S0 * 8 - %2 - %3)\;lsr\\t%0, %0, (%S0 * 8 - %2)"
+  [(set_attr "type" "complex")
+   (set_attr "length" "8")])
+
+
+
+;; Arithmetic Operations
+
+(define_expand "add<mode>3"
+  [(set (match_operand:QISI 0 "register_operand"		  "=r,r,r")
+	(plus:QISI (match_operand:QISI 1 "register_operand"   "%r,r,r")
+		 (match_operand:QISI 2 "nonmemory_operand"  "r,I,M")))]
+  ""
+  ""
+  [(set_attr "type" "alu")])
+
+(define_insn "adddi3"
+  [(set (match_operand:DI 0 "register_operand"		    "=&r,&r,&r")
+	(plus:DI (match_operand:DI 1 "register_operand"	    "%r,r,r")
+		 (match_operand:DI 2 "reg_or_ubyte_operand" "r,I,M")))]
+  ""
+  "@
+   add\\t%F0, %F1, %F2\;adc\\t%N0, %N1, %N2
+   add\\t%F0, %F1, %2\;adc\\t%N0, %N1, 0
+   sub\\t%F0, %F1, %n2\;suc\\t%N0, %N1, 0"
+  [(set_attr "type" "alu,alu,alu")
+   (set_attr "length" "8,8,8")])
+
+(define_expand "sub<mode>3"
+  [(set (match_operand:QISI 0 "register_operand"		      "=r,r,r")
+	(minus:QISI (match_operand:QISI 1 "reg_or_ubyte_operand"  "r,r,I")
+		  (match_operand:QISI 2 "reg_or_ubyte_operand"  "r,I,r")))]
+  ""
+  ""
+  [(set_attr "type" "alu")])
+
+(define_insn "subdi3"
+  [(set (match_operand:DI 0 "register_operand"		    "=&r,&r,&r")
+	(minus:DI (match_operand:DI 1 "register_operand"    "r,r,I")
+		 (match_operand:DI 2 "reg_or_ubyte_operand" "r,I,r")))]
+  ""
+  "@
+   sub\\t%F0, %F1, %F2\;suc\\t%N0, %N1, %N2
+   sub\\t%F0, %F1, %2\;suc\\t%N0, %N1, 0
+   rsb\\t%F0, %F2, %1\;rsc\\t%N0, %N2, 0"
+  [(set_attr "type" "alu,alu,alu")
+   (set_attr "length" "8,8,8")])
+
+;;  Negate and ones complement
+
+(define_expand "neg<mode>2"
+  [(set (match_operand:QISI 0 "register_operand"		"=r")
+	(neg:QISI (match_operand:QISI 1 "register_operand"	"r")))]
+  ""
+  ""
+  [(set_attr "type" "alu")])
+
+(define_expand "one_cmpl<mode>2"
+  [(set (match_operand:QISI 0 "register_operand"		"=r")
+	(not:QISI (match_operand:QISI 1 "register_operand"	"r")))]
+  ""
+  ""
+  [(set_attr "type" "alu")])
+
+;;  Integer logical Operations
+;;
+;; TODO - add optimized cases that exploit the fact that we can get away
+;; with a single machine op for special constants, e.g. UBYTE << (0/8/16/24)
+
+(define_code_iterator LOGICAL [and ior xor umin umax])
+(define_code_attr logical_asm [(and "and") (ior "or") (xor "xor") (umin "min") (umax "max")])
+
+(define_code_iterator LOGICAL_BITOP [and ior xor])
+(define_code_attr logical_bitop_asm [(and "and") (ior "or") (xor "xor")])
+
+(define_expand "<code><mode>3"
+  [(set (match_operand:QISI 0 "register_operand"			"=r")
+	(LOGICAL:QISI (match_operand:QISI 1 "register_operand"	"%r")
+		    (match_operand:QISI 2 "reg_or_ubyte_operand"	"rI")))]
+  ""
+  ""
+  [(set_attr "type" "alu")])
+
+
+;;  Shift instructions
+
+(define_code_iterator SHIFT  [ashift lshiftrt])
+(define_code_attr shift_op   [(ashift "ashl") (lshiftrt "lshr")])
+(define_code_attr shift_asm  [(ashift "lsl") (lshiftrt "lsr")])
+
+(define_expand "<shift_op><mode>3"
+  [(set (match_operand:QISI 0 "register_operand"		  "=r")
+	(SHIFT:QISI (match_operand:QISI 1 "register_operand"  "r")
+		  (match_operand:QISI 2 "shift_operand"	  "rL")))]
+  ""
+  ""
+  [(set_attr "type" "shift")])
+
+; LRA cannot cope with clobbered op2, hence the scratch register.
+(define_insn "ashr<mode>3"
+  [(set (match_operand:QISI 0 "register_operand" "=&r,r")
+	  (ashiftrt:QISI
+	   (match_operand:QISI 1 "register_operand" "0,r")
+	   (match_operand:QISI 2 "reg_or_const_1_operand" "r,P")))
+    (clobber (match_scratch:QISI 3 "=r,X"))]
+  ""
+  "@
+   mov %3, %2\;ASHRLP%=:\;qbeq ASHREND%=, %3, 0\; sub %3, %3, 1\; lsr\\t%0, %0, 1\; qbbc ASHRLP%=, %0, (%S0 * 8) - 2\; set %0, %0, (%S0 * 8) - 1\; jmp ASHRLP%=\;ASHREND%=:
+   lsr\\t%0, %1, 1\;qbbc LSIGN%=, %0, (%S0 * 8) - 2\;set %0, %0, (%S0 * 8) - 1\;LSIGN%=:"
+  [(set_attr "type" "complex,alu")
+   (set_attr "length" "28,4")])
+
+
+;; Include ALU patterns with zero-extension of operands.  That's where
+;; the real insns are defined.
+
+(include "alu-zext.md")
+
+(define_insn "<code>di3"
+  [(set (match_operand:DI 0 "register_operand" "=&r,&r")
+	  (LOGICAL_BITOP:DI
+	   (match_operand:DI 1 "register_operand"     "%r,r")
+	   (match_operand:DI 2 "reg_or_ubyte_operand" "r,I")))]
+  ""
+  "@
+   <logical_bitop_asm>\\t%F0, %F1, %F2\;<logical_bitop_asm>\\t%N0, %N1, %N2
+   <logical_bitop_asm>\\t%F0, %F1, %2\;<logical_bitop_asm>\\t%N0, %N1, 0"
+  [(set_attr "type" "alu,alu")
+   (set_attr "length" "8,8")])
+
+
+(define_insn "one_cmpldi2"
+  [(set (match_operand:DI 0 "register_operand"		"=r")
+	(not:DI (match_operand:DI 1 "register_operand"	"r")))]
+  ""
+  {
+    /* careful with overlapping source and destination regs.  */
+    gcc_assert (GP_REG_P (REGNO (operands[0])));
+    gcc_assert (GP_REG_P (REGNO (operands[1])));
+    if (REGNO (operands[0]) == (REGNO (operands[1]) + 4))
+      return "not\\t%N0, %N1\;not\\t%F0, %F1";
+    else
+      return "not\\t%F0, %F1\;not\\t%N0, %N1";
+  }
+  [(set_attr "type" "alu")
+   (set_attr "length" "8")])
+
+;; Multiply instruction.  Idea for fixing registers comes from the AVR backend.
+
+(define_expand "mulsi3"
+  [(set (match_operand:SI 0 "register_operand" "")
+	(mult:SI (match_operand:SI 1 "register_operand" "")
+		 (match_operand:SI 2 "register_operand" "")))]
+  ""
+  {
+     emit_insn (gen_mulsi3_fixinp (operands[0], operands[1], operands[2]));
+     DONE;
+  })
+
+
+(define_expand "mulsi3_fixinp"
+  [(set (reg:SI 112) (match_operand:SI 1 "register_operand" ""))
+   (set (reg:SI 116) (match_operand:SI 2 "register_operand" ""))
+   (set (reg:SI 104) (mult:SI (reg:SI 112) (reg:SI 116)))
+   (set (match_operand:SI 0 "register_operand" "") (reg:SI 104))]
+  ""
+  {
+  })
+
+(define_insn "*mulsi3_prumac"
+  [(set (reg:SI 104) (mult:SI (reg:SI 112) (reg:SI 116)))]
+  ""
+  "nop\;xin\\t0, r26, 4"
+  [(set_attr "type" "alu")
+   (set_attr "length" "8")])
+
+;; Prologue, Epilogue and Return
+
+(define_expand "prologue"
+  [(const_int 1)]
+  ""
+{
+  pru_expand_prologue ();
+  DONE;
+})
+
+(define_expand "epilogue"
+  [(return)]
+  ""
+{
+  pru_expand_epilogue (false);
+  DONE;
+})
+
+(define_expand "sibcall_epilogue"
+  [(return)]
+  ""
+{
+  pru_expand_epilogue (true);
+  DONE;
+})
+
+(define_insn "return"
+  [(simple_return)]
+  "pru_can_use_return_insn ()"
+  "ret")
+
+(define_insn "simple_return"
+  [(simple_return)]
+  ""
+  "ret")
+
+;; Block any insns from being moved before this point, since the
+;; profiling call to mcount can use various registers that aren't
+;; saved or used to pass arguments.
+
+(define_insn "blockage"
+  [(unspec_volatile [(const_int 0)] UNSPECV_BLOCKAGE)]
+  ""
+  ""
+  [(set_attr "type" "unknown")
+   (set_attr "length" "0")])
+
+;;  Jumps and calls
+
+(define_insn "indirect_jump"
+  [(set (pc) (match_operand:SI 0 "register_operand" "r"))]
+  ""
+  "jmp\\t%0"
+  [(set_attr "type" "control")])
+
+(define_insn "jump"
+  [(set (pc)
+	(label_ref (match_operand 0 "" "")))]
+  ""
+  "jmp\\t%%label(%l0)"
+  [(set_attr "type" "control")
+   (set_attr "length" "4")])
+
+
+(define_expand "call"
+  [(parallel [(call (match_operand 0 "" "")
+		    (match_operand 1 "" ""))
+	      (clobber (reg:HI RA_REGNO))])]
+  ""
+  "")
+
+(define_expand "call_value"
+  [(parallel [(set (match_operand 0 "" "")
+		   (call (match_operand 1 "" "")
+			 (match_operand 2 "" "")))
+	      (clobber (reg:HI RA_REGNO))])]
+  ""
+  "")
+
+(define_insn "*call"
+  [(call (mem:SI (match_operand:SI 0 "call_operand" "i,r"))
+	 (match_operand 1 "" ""))
+   (clobber (reg:HI RA_REGNO))]
+  ""
+  "@
+    call\\t%%label(%0)
+    call\\t%0"
+  [(set_attr "type" "control")])
+
+(define_insn "*call_value"
+  [(set (match_operand 0 "" "")
+	(call (mem:SI (match_operand:SI 1 "call_operand" "i,r"))
+	      (match_operand 2 "" "")))
+   (clobber (reg:HI RA_REGNO))]
+  ""
+  "@
+    call\\t%%label(%1)
+    call\\t%1"
+  [(set_attr "type" "control")])
+
+(define_expand "sibcall"
+  [(parallel [(call (match_operand 0 "" "")
+		    (match_operand 1 "" ""))
+	      (return)])]
+  ""
+  "")
+
+(define_expand "sibcall_value"
+  [(parallel [(set (match_operand 0 "" "")
+		   (call (match_operand 1 "" "")
+			 (match_operand 2 "" "")))
+	      (return)])]
+  ""
+  "")
+
+(define_insn "*sibcall"
+ [(call (mem:SI (match_operand:SI 0 "call_operand" "i,j"))
+	(match_operand 1 "" ""))
+  (return)]
+  "SIBLING_CALL_P (insn)"
+  "@
+    jmp\\t%%label(%0)
+    jmp\\t%0"
+  [(set_attr "type" "control")])
+
+(define_insn "*sibcall_value"
+ [(set (match_operand 0 "register_operand" "")
+       (call (mem:SI (match_operand:SI 1 "call_operand" "i,j"))
+	     (match_operand 2 "" "")))
+  (return)]
+  "SIBLING_CALL_P (insn)"
+  "@
+    jmp\\t%%label(%1)
+    jmp\\t%1"
+  [(set_attr "type" "control")])
+
+(define_insn "*tablejump"
+  [(set (pc)
+	(match_operand:SI 0 "register_operand" "r"))
+   (use (label_ref (match_operand 1 "" "")))]
+  ""
+  "jmp\\t%0"
+  [(set_attr "type" "control")])
+
+;; cbranch pattern.
+;;
+;; NOTE: The short branch check has no typo! We must be conservative and take
+;; into account the worst case of having a signed comparison with a
+;; "far taken branch" label, which amounts to 7 instructions.
+
+(define_insn "cbranch<mode>4"
+  [(set (pc)
+     (if_then_else
+       (match_operator 0 "ordered_comparison_operator"
+	 [(match_operand:QISI 1 "register_operand" "r,r,r")
+	  (match_operand:QISI 2 "reg_or_ubyte_operand" "r,Z,I")])
+       (label_ref (match_operand 3 "" ""))
+       (pc)))]
+  ""
+{
+  const int length = (get_attr_length (insn));
+  const bool is_near = (length == 20 || length == 4);
+
+  if (pru_signed_cmp_operator (operands[0], VOIDmode))
+    {
+      enum rtx_code code = GET_CODE (operands[0]);
+
+      if (which_alternative == 0)
+	return pru_output_signed_cbranch (operands, is_near);
+      else if (which_alternative == 1 && (code == LT || code == GE))
+	return pru_output_signed_cbranch_zeroop2 (operands, is_near);
+      else
+	return pru_output_signed_cbranch_ubyteop2 (operands, is_near);
+    }
+  else
+    {
+      /* PRU demands OP1 to be immediate, so swap operands.  */
+      if (is_near)
+	return "qb%P0\t%l3, %1, %2";
+      else
+	return "qb%Q0\t.+8, %1, %2\;jmp\t%%label(%l3)";
+    }
+}
+  [(set_attr "type" "control")
+   (set (attr "length")
+	(if_then_else
+	    (and (ge (minus (match_dup 3) (pc)) (const_int -2020))
+		 (le (minus (match_dup 3) (pc)) (const_int 2016)))
+	    (if_then_else
+		(match_test "pru_signed_cmp_operator (operands[0], VOIDmode)")
+		    (const_int 20)
+		    (const_int 4))
+	    (if_then_else
+		(match_test "pru_signed_cmp_operator (operands[0], VOIDmode)")
+		    (const_int 28)
+		    (const_int 8))))])
+
+
+(define_expand "cbranch<mode>4"
+  [(set (pc)
+	(if_then_else (match_operator 0 "pru_fp_comparison_operator"
+		       [(match_operand:SFDF 1 "register_operand" "")
+			(match_operand:SFDF 2 "register_operand" "")])
+		      (label_ref (match_operand 3 "" ""))
+		      (pc)))]
+  ""
+{
+  rtx t = pru_expand_fp_compare (operands[0], VOIDmode);
+  operands[0] = t;
+  operands[1] = XEXP (t, 0);
+  operands[2] = XEXP (t, 1);
+})
+
+;
+; Bit test branch
+
+(define_code_iterator BIT_TEST  [eq ne])
+(define_code_attr qbbx_op   [(eq "qbbc") (ne "qbbs")])
+(define_code_attr qbbx_negop   [(eq "qbbs") (ne "qbbc")])
+
+(define_insn "cbranch_qbbx_<BIT_TEST:code><EQS0:mode><EQS1:mode><EQD:mode>4"
+ [(set (pc)
+   (if_then_else
+    (BIT_TEST (zero_extract:EQD
+	 (match_operand:EQS0 0 "register_operand" "r")
+	 (const_int 1)
+	 (match_operand:EQS1 1 "reg_or_ubyte_operand" "rI"))
+     (const_int 0))
+    (label_ref (match_operand 2 "" ""))
+    (pc)))]
+  ""
+{
+  const int length = (get_attr_length (insn));
+  const bool is_near = (length == 4);
+  if (is_near)
+    return "<BIT_TEST:qbbx_op>\\t%l2, %0, %1";
+  else
+    return "<BIT_TEST:qbbx_negop>\\t.+8, %0, %1\;jmp\\t%%label(%l2)";
+}
+  [(set_attr "type" "control")
+   (set (attr "length")
+      (if_then_else
+	  (and (ge (minus (match_dup 2) (pc)) (const_int -2048))
+	       (le (minus (match_dup 2) (pc)) (const_int 2044)))
+	  (const_int 4)
+	  (const_int 8)))])
+
+;; ::::::::::::::::::::
+;; ::
+;; :: Low Overhead Looping - idea "borrowed" from MEP
+;; ::
+;; ::::::::::::::::::::
+
+;; This insn is volatile because we'd like it to stay in its original
+;; position, just before the loop header.  If it stays there, we might
+;; be able to convert it into a "loop" insn.
+(define_insn "doloop_begin_internal<mode>"
+  [(set (match_operand:HISI 0 "register_operand" "=r")
+	(unspec_volatile:HISI
+	 [(match_operand:HISI 1 "reg_or_ubyte_operand" "rI")
+	  (match_operand 2 "const_int_operand" "")] UNSPECV_LOOP_BEGIN))]
+  ""
+  { gcc_unreachable (); }
+  [(set_attr "length" "4")])
+
+(define_expand "doloop_begin"
+  [(use (match_operand 0 "register_operand" ""))
+   (use (match_operand 1 "" ""))]
+  "TARGET_OPT_LOOP"
+  "pru_emit_doloop (operands, 0);
+   DONE;
+  ")
+
+; Note: "JUMP_INSNs and CALL_INSNs are not allowed to have any output
+; reloads;". Hence this insn must be prepared for a counter that is
+; not a register.
+(define_insn "doloop_end_internal<mode>"
+  [(set (pc)
+	(if_then_else (ne (match_operand:HISI 0 "nonimmediate_operand" "+r,*m")
+			  (const_int 1))
+		      (label_ref (match_operand 1 "" ""))
+		      (pc)))
+   (set (match_dup 0)
+	(plus:HISI (match_dup 0)
+		 (const_int -1)))
+   (unspec [(match_operand 2 "const_int_operand" "")] UNSPECV_LOOP_END)
+   (clobber (match_scratch:HISI 3 "=X,&r"))]
+  ""
+  { gcc_unreachable (); }
+  ;; Worst case length:
+  ;;
+  ;;      sub <op3>, 1		4
+  ;;      qbeq .+8, <op3>, 0    4
+  ;;      jmp <op1>		4
+  [(set (attr "length")
+      (if_then_else
+	  (and (ge (minus (pc) (match_dup 1)) (const_int 0))
+	       (le (minus (pc) (match_dup 1)) (const_int 1020)))
+	  (const_int 4)
+	  (const_int 12)))])
+
+(define_expand "doloop_end"
+  [(use (match_operand 0 "nonimmediate_operand" ""))
+   (use (label_ref (match_operand 1 "" "")))]
+  "TARGET_OPT_LOOP"
+  "if (GET_CODE (operands[0]) == REG && GET_MODE (operands[0]) == QImode)
+     FAIL;
+   pru_emit_doloop (operands, 1);
+   DONE;
+  ")
+
+(define_insn "pruloop<mode>"
+  [(set (reg:HISI LOOPCNTR_REG)
+	(unspec:HISI [(match_operand:HISI 0 "reg_or_ubyte_operand" "rI")
+		    (label_ref (match_operand 1 "" ""))]
+		   UNSPECV_LOOP_BEGIN))]
+  ""
+  "loop\\t%l1, %0"
+  [(set_attr "length" "4")])
+
+(define_insn "pruloop_end"
+  [(unspec [(const_int 0)] UNSPECV_LOOP_END)]
+  ""
+  "# loop end"
+  [(set_attr "length" "0")])
+
+
+;;  Misc patterns
+
+(define_insn "delay_cycles_start"
+  [(unspec_volatile [(match_operand 0 "immediate_operand" "i")]
+		    UNSPECV_DELAY_CYCLES_START)]
+  ""
+  "/* Begin %0 cycle delay.  */"
+)
+
+(define_insn "delay_cycles_end"
+  [(unspec_volatile [(match_operand 0 "immediate_operand" "i")]
+		    UNSPECV_DELAY_CYCLES_END)]
+  ""
+  "/* End %0 cycle delay.  */"
+)
+
+
+(define_insn "delay_cycles_2x_plus1_hi"
+  [(unspec_volatile [(match_operand 0 "const_uhword_operand" "J")]
+		    UNSPECV_DELAY_CYCLES_2X_HI)
+   (clobber (match_scratch:SI 1 "=&r"))]
+  ""
+  "ldi\\t%1, %0\;sub\\t%1, %1, 1\;qbne\\t.-4, %1, 0"
+  [(set_attr "length" "12")])
+
+
+; Do not use LDI32 here because we do not want
+; to accidentally loose one instruction cycle.
+(define_insn "delay_cycles_2x_plus2_si"
+  [(unspec_volatile [(match_operand:SI 0 "const_int_operand" "n")]
+		    UNSPECV_DELAY_CYCLES_2X_SI)
+   (clobber (match_scratch:SI 1 "=&r"))]
+  ""
+  "ldi\\t%1.w0, %L0\;ldi\\t%1.w2, %H0\;sub\\t%1, %1, 1\;qbne\\t.-4, %1, 0"
+  [(set_attr "length" "16")])
+
+(define_insn "delay_cycles_1"
+  [(unspec_volatile [(const_int 0) ] UNSPECV_DELAY_CYCLES_1)]
+  ""
+  "nop\\t# delay_cycles_1"
+)
+
+
+(define_insn "nop"
+  [(const_int 0)]
+  ""
+  "nop"
+  [(set_attr "type" "alu")])
+
+(define_insn "nop_loop_guard"
+  [(const_int 0)]
+  ""
+  "nop\\t# Loop end guard"
+  [(set_attr "type" "alu")])
diff --git a/gcc/config/pru/pru.opt b/gcc/config/pru/pru.opt
new file mode 100644
index 00000000000..e17d92fe1d3
--- /dev/null
+++ b/gcc/config/pru/pru.opt
@@ -0,0 +1,53 @@
+; Options for the TI PRU port of the compiler.
+; Copyright (C) 2018 Free Software Foundation, Inc.
+; Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
+;
+; This file is part of GCC.
+;
+; GCC is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation; either version 3, or (at your option)
+; any later version.
+;
+; GCC is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; GNU General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with GCC; see the file COPYING3.  If not see
+; <http://www.gnu.org/licenses/>.
+
+HeaderInclude
+config/pru/pru-opts.h
+
+minrt
+Target Report Mask(MINRT) RejectNegative
+Use a minimum runtime (no static initializers or ctors) for memory-constrained
+devices.
+
+mmcu=
+Target RejectNegative Joined
+-mmcu=MCU	Select the target System-On-Chip variant that embeds this PRU.
+
+mno-relax
+Target Report
+Prevent relaxation of LDI32 relocations.
+
+mloop
+Target Mask(OPT_LOOP)
+Allow (or do not allow) gcc to use the LOOP instruction.
+
+mabi=
+Target RejectNegative Report Joined Enum(pru_abi_t) Var(pru_current_abi) Init(PRU_ABI_GNU) Save
+Select target ABI variant.
+
+Enum
+Name(pru_abi_t) Type(enum pru_abi)
+ABI variant code generation (for use with -mabi= option):
+
+EnumValue
+Enum(pru_abi_t) String(gnu) Value(PRU_ABI_GNU)
+
+EnumValue
+Enum(pru_abi_t) String(ti) Value(PRU_ABI_TI)
diff --git a/gcc/config/pru/t-pru b/gcc/config/pru/t-pru
new file mode 100644
index 00000000000..ab29e443882
--- /dev/null
+++ b/gcc/config/pru/t-pru
@@ -0,0 +1,31 @@
+# Makefile fragment for building GCC for the TI PRU target.
+# Copyright (C) 2012-2018 Free Software Foundation, Inc.
+# Contributed by Dimitar Dimitrov <dimitar.dinux.eu>
+# Based on the t-nios2
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published
+# by the Free Software Foundation; either version 3, or (at your
+# option) any later version.
+#
+# GCC is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+# the GNU General Public License for more details.
+#
+# You should have received a copy of the  GNU General Public
+# License along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+# Unfortunately mabi=ti is not feature-complete enough to build newlib.
+# Hence we cannot present mabi=gnu/ti as a multilib option.
+
+pru-pragma.o: $(srcdir)/config/pru/pru-pragma.c $(RTL_H) $(TREE_H) \
+		$(CONFIG_H) $(TM_H) $(srcdir)/config/pru/pru-protos.h
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<
+
+pru-passes.o: $(srcdir)/config/pru/pru-passes.c $(RTL_H) $(TREE_H) \
+		$(CONFIG_H) $(TM_H) $(srcdir)/config/pru/pru-protos.h
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 7b471ec40f7..920653848b3 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -21635,6 +21635,7 @@ for further explanation.
 * ARM Pragmas::
 * M32C Pragmas::
 * MeP Pragmas::
+* PRU Pragmas::
 * RS/6000 and PowerPC Pragmas::
 * S/390 Pragmas::
 * Darwin Pragmas::
@@ -21786,6 +21787,25 @@ extern int foo ();
 
 @end table
 
+@node PRU Pragmas
+@subsection PRU Pragmas
+
+@table @code
+
+@item ctable_entry @var{index} @var{constant_address}
+@cindex pragma, ctable_entry
+Specifies that the given PRU CTABLE entry at @var{index} has a value
+@var{constant_address}. This enables GCC to emit LBCO/SBCO instructions
+when the load/store address is known and can be addressed with some CTABLE
+entry.  Example:
+
+@smallexample
+#pragma ctable_entry 2 0x4802a000
+*(unsigned int *)0x4802a010 = val; /* will compile to "lbco Rx, 2, 0x10, 4" */
+@end smallexample
+
+@end table
+
 @node RS/6000 and PowerPC Pragmas
 @subsection RS/6000 and PowerPC Pragmas
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 1dcdfb51c47..ff3245ed3eb 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -1041,6 +1041,10 @@ See RS/6000 and PowerPC Options.
 -mstack-protector-guard=@var{guard} -mstack-protector-guard-reg=@var{reg} @gol
 -mstack-protector-guard-offset=@var{offset}}
 
+@emph{PRU Options}
+@gccoptlist{-mmcu=@var{mcu}  -minrt -mno-relax -mloop @gol
+-mabi=@var{variant} @gol}
+
 @emph{RISC-V Options}
 @gccoptlist{-mbranch-cost=@var{N-instruction} @gol
 -mplt  -mno-plt @gol
@@ -14620,6 +14624,7 @@ platform.
 * picoChip Options::
 * PowerPC Options::
 * PowerPC SPE Options::
+* PRU Options::
 * RISC-V Options::
 * RL78 Options::
 * RS/6000 and PowerPC Options::
@@ -23093,6 +23098,56 @@ the offset with a symbol reference to a canary in the TLS block.
 @end table
 
 
+@node PRU Options
+@subsection PRU Options
+@cindex PRU Options
+
+These command-line options are defined for PRU target:
+
+@table @gcctabopt
+@item -minrt
+@opindex minrt
+Enable the use of a minimum runtime environment - no static
+initializers or constructors.  Results in significant code size
+reduction of final ELF binaries.
+
+@item -mmcu=@var{mcu}
+@opindex mmcu
+Specify the PRU MCU variant to use.  Check newlib for exact list of options.
+
+@item -mno-relax
+@opindex mno-relax
+Pass on (or do not pass on) the @option{-mrelax} command-line option
+to the linker.
+
+@item -mloop
+@opindex mloop
+Allow (or do not allow) gcc to use the LOOP instruction.
+
+@item -mabi=@var{variant}
+@opindex mabi
+Specify the ABI variant to output code for.  Permissible values are @samp{gnu}
+for GCC, and @samp{ti} for fully conformant TI ABI.  These are the differences:
+
+@table @samp
+@item Function Pointer Size
+TI ABI specifies that function (code) pointers are 16-bit, whereas GCC
+supports only 32-bit data and code pointers.
+
+@item Optional Return Value Pointer
+Function return values larger than 64-bits are passed by using a hidden
+pointer as the first argument of the function.  TI ABI, though, mandates that
+the pointer can be NULL in case the caller is not using the returned value.
+GCC always passes and expects a valid return value pointer.
+
+@end table
+
+The current @samp{mabi=ti} implementation will simply raise a compile error
+when any of the above code constructs is detected.
+
+@end table
+
+
 @node RISC-V Options
 @subsection RISC-V Options
 @cindex RISC-V Options
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 734bc765387..01ebd96186a 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -3306,6 +3306,28 @@ Vector constant that is all zeros.
 
 @end table
 
+@item PRU---@file{config/pru/constraints.md}
+@table @code
+@item I
+An unsigned 8-bit integer constant.
+
+@item J
+An unsigned 16-bit integer constant.
+
+@item L
+An unsigned 5-bit integer constant (for shift counts).
+
+@item M
+An integer constant in the range [-255;0].
+
+@item T
+A text segment (program memory) constant label.
+
+@item Z
+Integer constant zero.
+
+@end table
+
 @item RL78---@file{config/rl78/constraints.md}
 @table @code
 
-- 
2.11.0


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