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re PR rtl-optimization/79593 (Poor/Worse code generation for FPU on versions after 6)

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PR rtl-optimization/79593
	* config/i386/i386.md (reg = mem; mem = reg): New define_peephole2.

From-SVN: r267740
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Jakub Jelinek 2019-01-08 23:29:56 +01:00 • committed by Jakub Jelinek
parent 524abb0957
commit 7e55f2d868
2 changed files with 15 additions and 0 deletions
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gcc/ChangeLog
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@ -1,5 +1,8 @@
2019-01-08 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/79593
* config/i386/i386.md (reg = mem; mem = reg): New define_peephole2.
* config/rs6000/rs6000.c (rs6000_delegitimize_address): Delegitimize
UNSPEC_FUSION_GPR to its argument. Formatting fixes.

12
gcc/config/i386/i386.md
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@ -18740,6 +18740,18 @@
const0_rtx);
})
;; Attempt to optimize away memory stores of values the memory already
;; has. See PR79593.
(define_peephole2
[(set (match_operand 0 "register_operand")
(match_operand 1 "memory_operand"))
(set (match_operand 2 "memory_operand") (match_dup 0))]
"!MEM_VOLATILE_P (operands[1])
&& !MEM_VOLATILE_P (operands[2])
&& rtx_equal_p (operands[1], operands[2])
&& !reg_overlap_mentioned_p (operands[0], operands[2])"
[(set (match_dup 0) (match_dup 1))])
;; Attempt to always use XOR for zeroing registers (including FP modes).
(define_peephole2
[(set (match_operand 0 "general_reg_operand")