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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/95443] cmpstrnqi patterns update string length
Date: Mon, 13 Jul 2020 17:34:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95443

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:9cba898481368ce16c6a2d30ef781a82dce27c55

commit r11-2068-g9cba898481368ce16c6a2d30ef781a82dce27c55
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 13 10:33:47 2020 -0700

    x86: Pass a copy of the string length to cmpstrnqi

    cmpstrnsi expander may pass the actual string length directly to cmpstr=
nqi
    patterns.  For cmpstrnsi, one of the strings must be a constant and
    expand_builtin_strncmp rewrites the length argument to be the minimum of
    the const string length and the actual string length.  But it is not the
    case for cmpmemsi.  Pass a copy of the string length to cmpstrnqi patte=
rns
    to avoid changing the actual string length by cmpstrnqi patterns.

    gcc/

            PR target/95443
            * config/i386/i386.md (cmpstrnsi): Pass a copy of the string
            length to cmpstrnqi patterns.

    gcc/testsuite/

            PR target/95443
            * gcc.target/i386/pr95443-1.c: New test.
            * gcc.target/i386/pr95443-2.c: Likewise.=