[Bug target/126550] RISC-V: auto-vectorization miscompiles duplicated deinterleave store via vcompress/vrgather (rv64gcv_zvl256b)

"rdapp at gcc dot gnu.org via Gcc-bugs" <[email protected]> Fri, 31 Jul 2026 15:44:11 +0000

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126550

--- Comment #2 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Yeah, the permute constant in the constant pool looks dubious:

.LC3:
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1
        .half   0
        .half   1

This should be 0, 1, 0, 1, 2, 3, 2, 3, ...