[Bug tree-optimization/123602] [13/14/15/16 Regression] ICE: SSA corruption during RTL pass: expand with -O2 and -std=c++20 flag since r8-18

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123602

--- Comment #5 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:134bc017ebac60eb53166998ec7efbc2e7f7e3b5

commit r16-6896-g134bc017ebac60eb53166998ec7efbc2e7f7e3b5
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jan 19 10:21:10 2026 +0100

    tree-optimization/123602 - avoid PRE-inserting abnormal SSA refs

    The following fixes an omission in find_or_generate_expression to
    check for SSA_NAME_OCCURS_IN_ABNORMAL_PHI as already done in
    create_expression_by_pieces.

            PR tree-optimization/123602
            * tree-ssa-pre.cc (find_or_generate_expression): Do not
            generate references to abnormal SSA names.

            * g++.dg/torture/pr123603.C: New testcase.