[Bug tree-optimization/107881] (a <= b) == (b >= a) should be optimized to (a == b)

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107881

--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:895e476f64c308dfdbf49693d0b1166c0b7733de

commit r14-3881-g895e476f64c308dfdbf49693d0b1166c0b7733de
Author: Andrew Pinski <apinski@marvell.com>
Date:   Mon Sep 11 15:35:59 2023 -0700

    MATCH: Simplify (a CMP1 b) ^ (a CMP2 b)

    This adds the missing optimizations here.
    Note we don't need to match where CMP1 and CMP2 are complements of each
    other as that is already handled elsewhere.

    I added a new executable testcase to make sure we optimize it correctly
    as I had originally messed up one of the entries for the resulting
    comparison to make sure they were 100% correct.

    OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

            PR tree-optimization/107881

    gcc/ChangeLog:

            * match.pd (`(a CMP1 b) ^ (a CMP2 b)`): New pattern.
            (`(a CMP1 b) == (a CMP2 b)`): New pattern.

    gcc/testsuite/ChangeLog:

            * gcc.c-torture/execute/pr107881-1.c: New test.
            * gcc.dg/tree-ssa/cmpeq-4.c: New test.
            * gcc.dg/tree-ssa/cmpxor-1.c: New test.