[Bug middle-end/50481] builtin to reverse the bit order

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50481

--- Comment #22 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:7ca53f9d86ef5f4c6a49f414f3cdd88d2b8a0bad

commit r17-549-g7ca53f9d86ef5f4c6a49f414f3cdd88d2b8a0bad
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Sat May 16 10:50:00 2026 +0200

    tree-ssa-ccp: Fix up __builtin_bitreverse* handling [PR50481]

    The committed __builtin_bitreverse* patch mishandled the
    bitwise CCP handling, it is true that BUILT_IN_BITREVERSE* can be
    handled there similarly to BUILT_IN_BSWAP*, but not exactly, for
    the latter we need (and do) bswap the value and mask constants,
    while for the former we obviously need to bitreverse them instead.

    2026-05-16  Jakub Jelinek  <jakub@redhat.com>

            PR target/50481
            * tree-ssa-ccp.cc (evaluate_stmt): Fix up
            BUILT_IN_BITREVERSE{8,16,32,64} handling.

            * gcc.dg/builtin-bitreverse-3.c: New test.

    Reviewed-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>