Hi!
The Yr constraint contrary to what has been said when it has been submitted
actually is always NO_REX_SSE_REGS or NO_REGS, never ALL_SSE_REGS, so
the RA restriction to only the first 8 regs is done no matter what we tune
for.
This is because we test X86_TUNE_AVOID_4BYTE_PREFIXES, which is an enum
value (59), rather than actually checking if the tune flag.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2016-05-24 Jakub Jelinek <ja...@redhat.com>
* config/i386/i386.h (TARGET_AVOID_4BYTE_PREFIXES): Define.
* config/i386/constraints.md (Yr): Test TARGET_AVOID_4BYTE_PREFIXES
rather than X86_TUNE_AVOID_4BYTE_PREFIXES.
--- gcc/config/i386/i386.h.jj 2016-05-24 10:56:02.000000000 +0200
+++ gcc/config/i386/i386.h 2016-05-24 15:13:05.715906018 +0200
@@ -465,6 +465,8 @@ extern unsigned char ix86_tune_features[
ix86_tune_features[X86_TUNE_SLOW_PSHUFB]
#define TARGET_VECTOR_PARALLEL_EXECUTION \
ix86_tune_features[X86_TUNE_VECTOR_PARALLEL_EXECUTION]
+#define TARGET_AVOID_4BYTE_PREFIXES \
+ ix86_tune_features[X86_TUNE_AVOID_4BYTE_PREFIXES]
#define TARGET_FUSE_CMP_AND_BRANCH_32 \
ix86_tune_features[X86_TUNE_FUSE_CMP_AND_BRANCH_32]
#define TARGET_FUSE_CMP_AND_BRANCH_64 \
--- gcc/config/i386/constraints.md.jj 2016-05-12 10:29:41.000000000 +0200
+++ gcc/config/i386/constraints.md 2016-05-24 15:14:21.647914550 +0200
@@ -142,7 +142,7 @@ (define_register_constraint "Yf"
"@internal Any x87 register when 80387 FP arithmetic is enabled.")
(define_register_constraint "Yr"
- "TARGET_SSE ? (X86_TUNE_AVOID_4BYTE_PREFIXES ? NO_REX_SSE_REGS :
ALL_SSE_REGS) : NO_REGS"
+ "TARGET_SSE ? (TARGET_AVOID_4BYTE_PREFIXES ? NO_REX_SSE_REGS : ALL_SSE_REGS)
: NO_REGS"
"@internal Lower SSE register when avoiding REX prefix and all SSE registers
otherwise.")
(define_register_constraint "Yv"
Jakub
