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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/112305] [11/12/13/14 Regression] Wrong code at
 -O1/2/3/s on x86_64-pc-linux-gnu
Date: Tue, 31 Oct 2023 12:10:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112305

--- Comment #5 from CVS 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:e3da1d7bb288c8c864f0284bc4bc5877b466a2f7

commit r14-5032-ge3da1d7bb288c8c864f0284bc4bc5877b466a2f7
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Oct 31 10:13:13 2023 +0100

    tree-optimization/112305 - SCEV cprop and conditional undefined overflow

    The following adjusts final value replacement to also rewrite the
    replacement to defined overflow behavior if there's conditionally
    evaluated stmts (with possibly undefined overflow), not only when
    we "folded casts".  The patch hooks into expression_expensive for
    this.

            PR tree-optimization/112305
            * tree-scalar-evolution.h (expression_expensive): Adjust.
            * tree-scalar-evolution.cc (expression_expensive): Record
            when we see a COND_EXPR.
            (final_value_replacement_loop): When the replacement contains
            a COND_EXPR, rewrite it to defined overflow.
            * tree-ssa-loop-ivopts.cc (may_eliminate_iv): Adjust.

            * gcc.dg/torture/pr112305.c: New testcase.=