[Bug target/103069] cmpxchg isn't optimized
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Apr 13 08:18:00 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103069
--- Comment #21 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hongyu Wang <hongyuw@gcc.gnu.org>:
https://gcc.gnu.org/g:522f25e90c781d284f8347a04940db8b41c42fd5
commit r12-8136-g522f25e90c781d284f8347a04940db8b41c42fd5
Author: Hongyu Wang <hongyu.wang@intel.com>
Date: Wed Apr 13 14:51:36 2022 +0800
i386: Fix infinite loop under -mrelax-cmpxchg-loop [PR 103069]
For -mrelax-cmpxchg-loop which relaxes atomic_fetch_<logic> loops,
there is a missing set to %eax when compare fails, which would result
in infinite loop in some benchmark. Add set to %eax to avoid it.
gcc/ChangeLog:
PR target/103069
* config/i386/i386-expand.cc (ix86_expand_cmpxchg_loop):
Add missing set to target_val at pause label.
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