i386.h (TARGET_AVOID_4BYTE_PREFIXES): Define.

	* 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.

From-SVN: r236662

gcc/ChangeLog

 2016-05-24  Jakub Jelinek  <jakub@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.
+
 	* config/i386/sse.md (<sse4_1>_round<ssemodesuffix><avxsizesuffix>):
 	Limit 1st alternative to noavx isa, split 2nd alternative into one
 	noavx and one avx alternative, use *x and Bm in the former and

gcc/config/i386/constraints.md

@@ -142,7 +142,7 @@
  "@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"

gcc/config/i386/i386.h

@@ -465,6 +465,8 @@ extern unsigned char ix86_tune_features[X86_TUNE_LAST];
 	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 \