The following patch corrects the constraint so that we only generate 'stxsiwx'
on Power8 or later hardware. Ok for trunk after successful bootstrap/regtest?
-Pat
2016-07-07 Pat Haugen <pthau...@us.ibm.com>
PR target/71800
* config/rs6000/rs6000.md (stfiwx): Change constraint to 'wu' to
prevent generation of 'stxsiwx' on pre Power8 hardware.
Index: config/rs6000/rs6000.md
===================================================================
--- config/rs6000/rs6000.md (revision 238117)
+++ config/rs6000/rs6000.md (working copy)
@@ -5748,7 +5748,7 @@ (define_expand "lround<mode>di2"
; An UNSPEC is used so we don't have to support SImode in FP registers.
(define_insn "stfiwx"
[(set (match_operand:SI 0 "memory_operand" "=Z,Z")
- (unspec:SI [(match_operand:DI 1 "gpc_reg_operand" "d,wv")]
+ (unspec:SI [(match_operand:DI 1 "gpc_reg_operand" "d,wu")]
UNSPEC_STFIWX))]
"TARGET_PPC_GFXOPT"
"@
