[Bug middle-end/125875] [14/15/16/17 Regression] ICE at -Os during RTL pass: expand

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125875

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:f3475825fe0c609482ab30714f2d616f9c7b8fd7

commit r17-1920-gf3475825fe0c609482ab30714f2d616f9c7b8fd7
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Jun 26 10:55:29 2026 +0200

    middle-end/125875 - incomplete guards on VEC_PERM_EXPR folding

    This fixes up match.pd patterns using can_vec_perm_const_p on
    existing permutations to indicate whether we are before or
    after vector lowering.  For this to be correct we have to use
    the new vec_perm_indices CTOR taking the actual permuted inputs
    so can_vec_perm_const_p can also handle the vec_shl/vec_shr
    expansion path.

            PR middle-end/125875
            * match.pd: When checking for !can_vec_perm_const_p also
            allow variable permutes and use the vec_perm_indices CTOR
            with the original tree operands.

            * gcc.dg/torture/pr125875.c: New testcase.