[Bug middle-end/79173] add-with-carry and subtract-with-borrow support (x86_64 and others)

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79173

--- Comment #19 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:ec52d228d6db7f77188ad099a8c0ff65dead3241

commit r14-1836-gec52d228d6db7f77188ad099a8c0ff65dead3241
Author: Jakub Jelinek <ja...@redhat.com>
Date:   Thu Jun 15 09:08:37 2023 +0200

    i386: Add peephole2 patterns to improve subtract with borrow with memory
destination [PR79173]

    This patch adds subborrow<mode> alternative so that it can have memory
    destination and adds various peephole2s which help to match it.

    2023-06-15  Jakub Jelinek  <ja...@redhat.com>

            PR middle-end/79173
            * config/i386/i386.md (subborrow<mode>): Add alternative with
            memory destination and add for it define_peephole2
            TARGET_READ_MODIFY_WRITE/-Os patterns to prefer using memory
            destination in these patterns.