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| author | Jakub Jelinek <jakub@redhat.com> | 2019-01-08 23:29:56 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2019-01-08 23:29:56 +0100 |
| commit | 7e55f2d86830d45cbad7cf19d58e4c675fd20579 (patch) | |
| tree | cf399910cc7c38a9880d98e9da9d491d685ff9da | |
| parent | 524abb09579f8f59923c40b7ddcdc9faaad279dd (diff) | |
| download | gcc-7e55f2d86830d45cbad7cf19d58e4c675fd20579.zip gcc-7e55f2d86830d45cbad7cf19d58e4c675fd20579.tar.gz gcc-7e55f2d86830d45cbad7cf19d58e4c675fd20579.tar.bz2 | |
re PR rtl-optimization/79593 (Poor/Worse code generation for FPU on versions after 6)
PR rtl-optimization/79593
* config/i386/i386.md (reg = mem; mem = reg): New define_peephole2.
From-SVN: r267740
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/config/i386/i386.md | 12 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3ef7718..10f8e13 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index c8123cb..83124cc 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -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") |