[Bug sanitizer/120201] [13/14/15/16/17 Regression] generates a misaligned vector operation for std::memcpy with -march=znver4 since santizer doesn't allocate properly aligned stack by r6-6813-g63998a6336239d

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120201

--- Comment #24 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:0f485cf70171a41ea39deec0a8b65aad0b9d2a9b

commit r17-2387-g0f485cf70171a41ea39deec0a8b65aad0b9d2a9b
Author: Jakub Jelinek <ja...@redhat.com>
Date:   Tue Jul 14 10:37:03 2026 +0200

    cfgexpand: Align the whole asan var block to crtl->stack_alignment_needed
[PR120201]

    If crtl->stack_alignment_needed / BITS_PER_UNIT is larger than
    data.asan_alignb, we can end up with misaligned stack for further
    allocations (e.g. to spill SSA_NAMEs with vector modes and large
    alignment).

    This patch increments data.asan_alignb in that case.

    2026-07-14  Jakub Jelinek  <ja...@redhat.com>
                H.J. Lu  <hjl.to...@gmail.com>

            PR tree-optimization/120201
            * cfgexpand.cc (expand_used_vars): Set data.asan_alignb to
            maximum of itself and crtl->stack_alignment_needed
            / BITS_PER_UNIT.

            * g++.dg/asan/pr120201-1.C: New test.

    Signed-off-by: H.J. Lu <hjl.to...@gmail.com>