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

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

--- Comment #29 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jakub Jelinek
<[email protected]>:

https://gcc.gnu.org/g:fcedd47a470df6cff26dabadaaf4fc12e9094dbf

commit r13-10442-gfcedd47a470df6cff26dabadaaf4fc12e9094dbf
Author: Jakub Jelinek <[email protected]>
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  <[email protected]>
                H.J. Lu  <[email protected]>

            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 <[email protected]>
    (cherry picked from commit 0f485cf70171a41ea39deec0a8b65aad0b9d2a9b)