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[msp430] special case sym->SI moves
- From: DJ Delorie <dj at redhat dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 5 Jun 2015 01:00:08 -0400
- Subject: [msp430] special case sym->SI moves
- Authentication-results: sourceware.org; auth=none
Symbols are normally PSImode, and the MSP430 has PSImode registers and
PSImode moves to reg/mem. But sometimes gcc uses an SImode move
instead, if the result will later be used in SImode (as in getP() in
gcc/testsuite/gcc.dg/torture/pr65077.c). Committed.
* config/msp430/msp430.md (movsi_s): New. Special case for
storing a 20-bit symbol into a 32-bit register.
* config/msp430/msp430.c (msp430_subreg): Add support for it.
* config/msp430/predicates.md (msp430_symbol_operand): New.
Index: gcc/config/msp430/predicates.md
===================================================================
--- gcc/config/msp430/predicates.md (revision 224143)
+++ gcc/config/msp430/predicates.md (working copy)
@@ -79,6 +79,10 @@
; TRUE for constants which are bit positions for zero_extract
(define_predicate "msp430_bitpos"
(and (match_code "const_int")
(match_test (" INTVAL (op) >= 0
&& INTVAL (op) <= 15 "))))
+
+(define_predicate "msp430_symbol_operand"
+ (match_code "symbol_ref")
+)
Index: gcc/config/msp430/msp430.md
===================================================================
--- gcc/config/msp430/msp430.md (revision 224143)
+++ gcc/config/msp430/msp430.md (working copy)
@@ -211,12 +211,25 @@
[(set (match_operand:SI 0 "nonimmediate_operand")
(match_operand:SI 1 "general_operand"))]
""
""
)
+(define_insn_and_split "movsi_s"
+ [(set (match_operand:SI 0 "nonimmediate_operand" "=rm")
+ (subreg:SI (match_operand:PSI 1 "msp430_symbol_operand" "i") 0))]
+ ""
+ ""
+ "reload_completed"
+ [(set (match_operand:HI 2 "nonimmediate_operand")
+ (match_operand:HI 4 "general_operand"))
+ (set (match_operand:HI 3 "nonimmediate_operand")
+ (match_operand:HI 5 "general_operand"))]
+ "msp430_split_movsi (operands);"
+ )
+
(define_insn_and_split "movsi_x"
[(set (match_operand:SI 0 "nonimmediate_operand" "=rm")
(match_operand:SI 1 "general_operand" "rmi"))]
""
"#"
"reload_completed"
Index: gcc/config/msp430/msp430.c
===================================================================
--- gcc/config/msp430/msp430.c (revision 224143)
+++ gcc/config/msp430/msp430.c (working copy)
@@ -2371,12 +2371,19 @@ msp430_subreg (machine_mode mode, rtx r,
rv = gen_rtx_SUBREG (mode, ireg, byte);
else
rv = simplify_gen_subreg (mode, ireg, imode, byte);
}
else if (GET_CODE (r) == MEM)
rv = adjust_address (r, mode, byte);
+ else if (GET_CODE (r) == SYMBOL_REF
+ && (byte == 0 || byte == 2)
+ && mode == HImode)
+ {
+ rv = gen_rtx_ZERO_EXTRACT (HImode, r, GEN_INT (16), GEN_INT (8*byte));
+ rv = gen_rtx_CONST (HImode, r);
+ }
else
rv = simplify_gen_subreg (mode, r, omode, byte);
if (!rv)
gcc_unreachable ();