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| author | Jakub Jelinek <jakub@redhat.com> | 2019-11-19 10:31:59 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2019-11-19 10:31:59 +0100 |
| commit | 63b887119024128efaeb122193c935397c2572e9 (patch) | |
| tree | e81c2ec143652cdfe8583b8a1b11117e6fdd01b4 /gcc/config | |
| parent | beeac4c2716e5873648c67f71ba810cc02f7f8a8 (diff) | |
| download | gcc-63b887119024128efaeb122193c935397c2572e9.zip gcc-63b887119024128efaeb122193c935397c2572e9.tar.gz gcc-63b887119024128efaeb122193c935397c2572e9.tar.bz2 | |
re PR target/92549 (Use x86 xchg instruction more)
PR target/92549
* config/i386/i386.md (peephole2 for *swap<mode>): New peephole2.
* gcc.target/i386/pr92549.c: New test.
From-SVN: r278439
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.md | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index fb2235a..7ff5872 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -2787,6 +2787,17 @@ (set_attr "amdfam10_decode" "double") (set_attr "bdver1_decode" "double")]) +(define_peephole2 + [(set (match_operand:SWI 0 "register_operand") + (match_operand:SWI 1 "register_operand")) + (set (match_dup 1) + (match_operand:SWI 2 "register_operand")) + (set (match_dup 2) (match_dup 0))] + "peep2_reg_dead_p (3, operands[0]) + && optimize_insn_for_size_p ()" + [(parallel [(set (match_dup 1) (match_dup 2)) + (set (match_dup 2) (match_dup 1))])]) + (define_expand "movstrict<mode>" [(set (strict_low_part (match_operand:SWI12 0 "register_operand")) (match_operand:SWI12 1 "general_operand"))] |