[Bug target/92549] Use x86 xchg instruction more

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92549

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Nov 19 09:31:59 2019
New Revision: 278439

URL: https://gcc.gnu.org/viewcvs?rev=278439&root=gcc&view=rev
Log:
        PR target/92549
        * config/i386/i386.md (peephole2 for *swap<mode>): New peephole2.

        * gcc.target/i386/pr92549.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr92549.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog