[Bug target/117930] Improve rotates by C - x or C + x where C is multiple of bitsize on x86

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117930

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:4abcf4ad38a4081f02ed09aed7892a3a6af61cbb

commit r15-6010-g4abcf4ad38a4081f02ed09aed7892a3a6af61cbb
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Sat Dec 7 11:40:12 2024 +0100

    i386: x r<< (c - y) to x r>> y etc. optimization [PR117930]

    The following patch optimizes x r<< (c - y) to x r>> y,
    x r>> (c - y) to x r<< y, x r<< (c + y) to x r<< y and
    x r>> (c + y) to x r>> y if c is a multiple of x's bitsize.

    2024-12-07  Jakub Jelinek  <jakub@redhat.com>

            PR target/117930
            * config/i386/i386.md (crotate): New define_code_attr.
            (*<insn><mode>3_add, *<insn><mode>3_add_1,
            *<insn><mode>3_sub, *<insn><mode>3_sub_1): New
define_insn_and_split
            patterns plus following define_split for constant first input
            operand.

            * gcc.target/i386/pr117930.c: New test.