[Bug rtl-optimization/123585] [13/14/15/16 Regression] X86 avx2: ICE at -O1 during RTL pass: combine

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123585

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:

https://gcc.gnu.org/g:73bf30c8c9fc8a2cfe4720160c3dfbf99b4b5f58

commit r16-6923-g73bf30c8c9fc8a2cfe4720160c3dfbf99b4b5f58
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Tue Jan 20 14:07:55 2026 +0000

    PR rtl-optimization/123585: ICE in vec_select simplification on x86_64.

    This patch is my proposed fix to PR rtl-optimization/123585, an ICE caused
    by some incorrect logic in a gcc_assert.

    2026-01-20  Roger Sayle  <roger@nextmovesoftware.com>

    gcc/ChangeLog
            PR rtl-optimization/123585
            * simplify-rtx.cc (simplify_context::simplify_binary_operation_1)
            <case VEC_SELECT>: Correct gcc_assert when optimizing a vec_select
            of a vec_select with differing vector lengths.

    gcc/testsuite/ChangeLog
            PR rtl-optimization/123585
            * gcc.target/i386/pr123585.c: New test case.