Handle Octeon 3 not supporting MIPS paired-single instructions

[Joseph Myers <joseph at codesourcery dot com>]

The Octeon 3 processor does not support the MIPS paired-single
instructions.  This results in illegal instruction errors in the
testsuite when vectorization tests try to use those instructions.

This patch teaches the compiler about that lack of support, so that
warnings are given when -mpaired-single (or something implying it) is
used when compiling for such a processor.  I chose to test
TARGET_OCTEON as the simplest conditional; since the older Octeon
processors don't support hard float at all, I don't think the choice
matters for them.  Tests that then failed with the warning were
updated to disable them for Octeon.

Tested with no regressions for cross to mips64el-linux-gnu (Octeon
3).  OK to commit?

gcc:
2016-01-09  Joseph Myers  <joseph@codesourcery.com>

	* config/mips/mips.h (ISA_HAS_PAIRED_SINGLE): Require
	!TARGET_OCTEON.

gcc/testsuite:
2016-01-09  Joseph Myers  <joseph@codesourcery.com>

	* gcc.target/mips/mips-3d-1.c: Use forbid_cpu=octeon.* in
	dg-options.
	* gcc.target/mips/mips-3d-2.c: Likewise.
	* gcc.target/mips/mips-3d-3.c: Likewise.
	* gcc.target/mips/mips-3d-4.c: Likewise.
	* gcc.target/mips/mips-3d-5.c: Likewise.
	* gcc.target/mips/mips-3d-6.c: Likewise.
	* gcc.target/mips/mips-3d-7.c: Likewise.
	* gcc.target/mips/mips-3d-8.c: Likewise.
	* gcc.target/mips/mips-3d-9.c: Likewise.
	* gcc.target/mips/mips-ps-1.c: Likewise.
	* gcc.target/mips/mips-ps-2.c: Likewise.
	* gcc.target/mips/mips-ps-3.c: Likewise.
	* gcc.target/mips/mips-ps-4.c: Likewise.
	* gcc.target/mips/mips-ps-5.c: Likewise.
	* gcc.target/mips/mips-ps-6.c: Likewise.
	* gcc.target/mips/mips-ps-7.c: Likewise.
	* gcc.target/mips/mips-ps-type.c: Likewise.
	* gcc.target/mips/mips-ps-type-2.c: Likewise.
	* gcc.target/mips/mips16-attributes-6.c: Likewise.

Index: gcc/config/mips/mips.h
===================================================================
--- gcc/config/mips/mips.h	(revision 232142)
+++ gcc/config/mips/mips.h	(working copy)
@@ -1014,9 +1014,10 @@
 #define ISA_HAS_LXC1_SXC1	ISA_HAS_FP4
 
 /* ISA has paired-single instructions.  */
-#define ISA_HAS_PAIRED_SINGLE	(ISA_MIPS64				\
-				 || (mips_isa_rev >= 2			\
-				     && mips_isa_rev <= 5))
+#define ISA_HAS_PAIRED_SINGLE	((ISA_MIPS64				\
+				  || (mips_isa_rev >= 2			\
+				      && mips_isa_rev <= 5))		\
+				 && !TARGET_OCTEON)
 
 /* ISA has conditional trap instructions.  */
 #define ISA_HAS_COND_TRAP	(!ISA_MIPS1				\
Index: gcc/testsuite/gcc.target/mips/mips-3d-8.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-8.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-8.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D absolute compare and conditional move builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-type-2.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-type-2.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-type-2.c	(working copy)
@@ -1,7 +1,7 @@
 /* Test v2sf calculations.  The nmadd and nmsub patterns need
    -ffinite-math-only.  */
 /* { dg-do compile } */
-/* { dg-options "(HAS_MADDPS) -mgp32 -mpaired-single -ffinite-math-only" } */
+/* { dg-options "(HAS_MADDPS) -mgp32 -mpaired-single -ffinite-math-only forbid_cpu=octeon.*" } */
 /* { dg-skip-if "nmadd and nmsub need combine" { *-*-* } { "-O0" } { "" } } */
 /* { dg-final { scan-assembler "\tcvt.ps.s\t" } } */
 /* { dg-final { scan-assembler "\tmov.ps\t" } } */
Index: gcc/testsuite/gcc.target/mips/mips-ps-1.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-1.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-1.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mpaired-single" } */
+/* { dg-options "-mpaired-single forbid_cpu=octeon.*" } */
 
 /* Test v2sf calculations */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-1.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-1.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-1.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-9.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-9.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-9.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Matrix Multiplications */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-2.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-2.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-2.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mpaired-single" } */
+/* { dg-options "-mpaired-single forbid_cpu=octeon.*" } */
 
 /* Test MIPS paired-single builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-2.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-2.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-2.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D branch-if-any-two builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-type.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-type.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-type.c	(working copy)
@@ -1,7 +1,7 @@
 /* Test v2sf calculations.  The nmadd and nmsub patterns need
    -ffinite-math-only.  */
 /* { dg-do compile } */ 
-/* { dg-options "-mpaired-single -mgp64 -ffinite-math-only" } */
+/* { dg-options "-mpaired-single -mgp64 -ffinite-math-only forbid_cpu=octeon.*" } */
 /* { dg-skip-if "nmadd and nmsub need combine" { *-*-* } { "-O0" } { "" } } */
 /* { dg-final { scan-assembler "\tcvt.ps.s\t" } } */
 /* { dg-final { scan-assembler "\tmov.ps\t" } } */
Index: gcc/testsuite/gcc.target/mips/mips-ps-3.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-3.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-3.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mpaired-single" } */
+/* { dg-options "-mpaired-single forbid_cpu=octeon.*" } */
 
 /* Test MIPS paired-single conditional move */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-3.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-3.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-3.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D absolute compare builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-4.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-4.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-4.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mpaired-single" } */
+/* { dg-options "-mpaired-single forbid_cpu=octeon.*" } */
 
 /* Test MIPS paired-single comparisons */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-4.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-4.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-4.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D branch-if-any-four builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-5.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-5.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-5.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mpaired-single -mgp64 -ftree-vectorize" } */
+/* { dg-options "-mpaired-single -mgp64 -ftree-vectorize forbid_cpu=octeon.*" } */
 /* { dg-skip-if "requires vectorization" { *-*-* } { "-O0" "-Os" } { "" } } */
 
 extern float a[] __attribute__ ((aligned (8)));
Index: gcc/testsuite/gcc.target/mips/mips-3d-5.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-5.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-5.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D absolute-compare & branch-if-any-four builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-6.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-6.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-6.c	(working copy)
@@ -1,7 +1,7 @@
 /* mips-ps-2.c with an extra -ffinite-math-only option.  This option
    changes the way that abs.ps is handled.  */
 /* { dg-do run } */
-/* { dg-options "-mpaired-single -ffinite-math-only" } */
+/* { dg-options "-mpaired-single -ffinite-math-only forbid_cpu=octeon.*" } */
 
 /* Test MIPS paired-single builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-3d-6.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-6.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-6.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D absolute compare (floats) builtin functions */
 #include <stdlib.h>
Index: gcc/testsuite/gcc.target/mips/mips-ps-7.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-ps-7.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-ps-7.c	(working copy)
@@ -1,6 +1,6 @@
 /* mips-ps-5.c with -mgp32 instead of -mgp64.  */
 /* { dg-do compile } */
-/* { dg-options "-mgp32 -mpaired-single -ftree-vectorize" } */
+/* { dg-options "-mgp32 -mpaired-single -ftree-vectorize forbid_cpu=octeon.*" } */
 /* { dg-skip-if "requires vectorization" { *-*-* } { "-O0" "-Os" } { "" } } */
 
 extern float a[] __attribute__ ((aligned (8)));
Index: gcc/testsuite/gcc.target/mips/mips16-attributes-6.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips16-attributes-6.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips16-attributes-6.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mips16 addressing=absolute -mips3d" } */
+/* { dg-options "-mips16 addressing=absolute -mips3d forbid_cpu=octeon.*" } */
 
 static inline NOMIPS16 float
 i1 (float f)
Index: gcc/testsuite/gcc.target/mips/mips-3d-7.c
===================================================================
--- gcc/testsuite/gcc.target/mips/mips-3d-7.c	(revision 232142)
+++ gcc/testsuite/gcc.target/mips/mips-3d-7.c	(working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mips3d" } */
+/* { dg-options "-mips3d forbid_cpu=octeon.*" } */
 
 /* Test MIPS-3D absolute compare (doubles) builtin functions */
 #include <stdlib.h>

-- 
Joseph S. Myers
joseph@codesourcery.com