[Bug target/126411] RISC-V rv64gcv: wrong code at -O0 with simple shuffle

souradiptodas6 at gmail dot com via Gcc-bugs <[email protected]> Mon, 27 Jul 2026 20:48:52 +0000

Newsgroups	gmane.comp.gcc.bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126411

Souradipto Das <souradiptodas6 at gmail dot com> changed:

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                 CC|                            |souradiptodas6 at gmail dot com

--- Comment #2 from Souradipto Das <souradiptodas6 at gmail dot com> ---
Created attachment 65147
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65147&action=edit
[PATCH] RISC-V: Reject non-monotonic shuffle masks in slide patterns

Hi, I added checks so that intermediate elements conform to the expected
monotonic slide segments. I wasn't able to get a clean make check run locally
due to DejaGNU board-file configuration issues on my end (unrelated to the
patch itself) but i was able to verify that the patch holds its effectiveness
on this bug