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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/110386] [11/12 Regression] ICE with ABSU in
 backprop
Date: Thu, 09 May 2024 07:25:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110386

--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Andrew Pinski
<pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:f5c7306d7f039e5c74c5e82cf06610f0ae07a0e8

commit r12-10434-gf5c7306d7f039e5c74c5e82cf06610f0ae07a0e8
Author: Andrew Pinski <apinski@marvell.com>
Date:   Sat Sep 23 21:53:09 2023 -0700

    Fix PR 110386: backprop vs ABSU_EXPR

    The issue here is that when backprop tries to go
    and strip sign ops, it skips over ABSU_EXPR but
    ABSU_EXPR not only does an ABS, it also changes the
    type to unsigned.
    Since strip_sign_op_1 is only supposed to strip off
    sign changing operands and not ones that change types,
    removing ABSU_EXPR here is correct. We don't handle
    nop conversions so this does cause any missed optimizations either.

    OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

            PR tree-optimization/110386

    gcc/ChangeLog:

            * gimple-ssa-backprop.cc (strip_sign_op_1): Remove ABSU_EXPR.

    gcc/testsuite/ChangeLog:

            * gcc.c-torture/compile/pr110386-1.c: New test.
            * gcc.c-torture/compile/pr110386-2.c: New test.

    (cherry picked from commit 2bbac12ea7bd8a3eef5382e1b13f6019df4ec03f)=