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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/110838] [14 Regression] wrong code on
 x365-3.5, -O3, sign extraction
Date: Fri, 04 Aug 2023 11:15:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110838

--- Comment #11 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:1a599caab86464006ea8c9501aff6c6638e891eb

commit r14-2987-g1a599caab86464006ea8c9501aff6c6638e891eb
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Aug 4 12:11:45 2023 +0200

    tree-optimization/110838 - vectorization of widened right shifts

    The following fixes a problem with my last attempt of avoiding
    out-of-bound shift values for vectorized right shifts of widened
    operands.  Instead of truncating the shift amount with a bitwise
    and we actually need to saturate it to the target precision.

    The following does that and adds test coverage for the constant
    and invariant but variable case that would previously have failed.

            PR tree-optimization/110838
            * tree-vect-patterns.cc (vect_recog_over_widening_pattern):
            Fix right-shift value sanitizing.  Properly emit external
            def mangling in the preheader rather than in the pattern
            def sequence where it will fail vectorizing.

            * gcc.dg/vect/pr110838.c: New testcase.=