[Bug target/121934] [16 regression] ICE on valid code at -O3 "-fno* ..." on x86_64-linux-gnu: in expand_set_or_cpymem_prologue_epilogue_by_misaligned_moves, at config/i386/i386-expand.cc:8873

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121934

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>:

https://gcc.gnu.org/g:32b8d1312382e3f179df4f76eca840486d6608e8

commit r16-3857-g32b8d1312382e3f179df4f76eca840486d6608e8
Author: H.J. Lu <hjl.to...@gmail.com>
Date:   Sat Sep 13 06:38:44 2025 -0700

    x86: Don't align destination for a single instruction

    If a single instruction can store or move the whole block of memory, use
    vector instruction and don't align destination.

    gcc/

            PR target/121934
            * config/i386/i386-expand.cc (ix86_expand_set_or_cpymem): If a
            single instruction can store or move the whole block of memory,
            use vector instruction and don't align destination.

    gcc/testsuite/

            PR target/121934
            * gcc.target/i386/pr121934-1a.c: New test.
            * gcc.target/i386/pr121934-1b.c: Likewise.
            * gcc.target/i386/pr121934-2a.c: Likewise.
            * gcc.target/i386/pr121934-2b.c: Likewise.
            * gcc.target/i386/pr121934-3a.c: Likewise.
            * gcc.target/i386/pr121934-3b.c: Likewise.
            * gcc.target/i386/pr121934-4a.c: Likewise.
            * gcc.target/i386/pr121934-4b.c: Likewise.
            * gcc.target/i386/pr121934-5a.c: Likewise.
            * gcc.target/i386/pr121934-5b.c: Likewise.

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