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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 rtl-optimization/91838] [8/9 Regression] incorrect use of shr
 and shrx to shift by 64, missed optimization of vector shift
Date: Tue, 26 Mar 2024 15:05:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91838

--- Comment #22 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Andre Simoes Dias Vieira
<avieira@gcc.gnu.org>:

https://gcc.gnu.org/g:1ddd9f9e53bd649d3d236f7941106d8cc46e7358

commit r12-10293-g1ddd9f9e53bd649d3d236f7941106d8cc46e7358
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jul 27 13:08:32 2023 +0200

    tree-optimization/91838 - fix FAIL of g++.dg/opt/pr91838.C

    The following fixes the lack of simplification of a vector shift
    by an out-of-bounds shift value.  For scalars this is done both
    by CCP and VRP but vectors are not handled there.  This results
    in PR91838 differences in outcome dependent on whether a vector
    shift ISA is available and thus vector lowering does or does not
    expose scalar shifts here.

    The following adds a match.pd pattern to catch uniform out-of-bound
    shifts, simplifying them to zero when not sanitizing shift amounts.

            PR tree-optimization/91838
            * gimple-match-head.cc: Include attribs.h and asan.h.
            * generic-match-head.cc: Likewise.
            * match.pd (([rl]shift @0 out-of-bounds) -> zero): New pattern.

    (cherry picked from commit d1c072a1c3411a6fe29900750b38210af8451eeb)=