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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112939] [14 Regression] ICE: verify_ssa
 failed with -O -ftrivial-auto-var-init=zero
Date: Tue, 12 Dec 2023 07:16:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112939

--- Comment #3 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:f5f33b44b5dd4c41ae335445ae3f06b1ca3cfbcb

commit r14-6448-gf5f33b44b5dd4c41ae335445ae3f06b1ca3cfbcb
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Dec 11 13:00:18 2023 +0100

    tree-optimization/112939 - VN PHI visiting and -ftrivial-auto-var-init

    The following builds upon the last fix, making sure we only value-number
    to visited (un-)defs, otherwise prefer .VN_TOP.

            PR tree-optimization/112939
            * tree-ssa-sccvn.cc (visit_phi): When all args are undefined
            make sure we end up with a value that was visited, otherwise
            fall back to .VN_TOP.

            * gcc.dg/pr112939.c: New testcase.=