[Bug target/126516] [17 Regression] 9% slowdown of calculix on Zen3 since r17-2723-g3f2b3eced0f827

"jmelcr at gcc dot gnu.org via Gcc-bugs" <[email protected]> Mon, 10 Aug 2026 16:06:38 +0000

Newsgroups	gmane.comp.gcc.bugs
Message-ID	<[email protected]/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126516

--- Comment #2 from Josef Melcr <jmelcr at gcc dot gnu.org> ---
(In reply to Hongtao Liu from comment #1)
> Could you help reproduce a testcase for it, I don't think shorter fold left
> reduction itself can regress it by 9%, could trigger other issue.

Just an update, I am trying to reduce a testcase for you, but it's taking a
while. Hopefully I'll have something for you soon.