https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100320
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c |target
Target Milestone|--- |8.5
CC| |hubicka at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Last reconfirmed| |2021-04-28
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Summary|regression: 32-bit x86 |[8/9/10/11/12 Regression]
|memcpy is suboptimal |32-bit x86 memcpy is
| |suboptimal
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed, at least with -minline-all-stringops -Os -m32 -fomit-frame-pointer
starting with r0-68071-g95935e2db5c45bef5631f51538d1e10d8b5b7524
it was a series of movsl insns and starting with most likely
r0-77675-g8c996513856f2769aee1730cb211050fef055fb5
(can't know for sure, as the compiler then ICEs for a couple of revisions on
it) it is back rep movsl.
