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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/113811] std::rotate does 64-bit signed division
Date: Thu, 15 Feb 2024 11:44:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113811

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:4d819db7f229a23cb15ef68f310e0bb51d201c45

commit r14-9001-g4d819db7f229a23cb15ef68f310e0bb51d201c45
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Feb 8 15:40:32 2024 +0000

    libstdc++: Use unsigned division in std::rotate [PR113811]

    Signed 64-bit division is much slower than unsigned, so cast the n and
    k values to unsigned before doing n %=3D k. We know this is safe because
    neither value can be negative.

    libstdc++-v3/ChangeLog:

            PR libstdc++/113811
            * include/bits/stl_algo.h (__rotate): Use unsigned values for
            division.=