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Subject: [Bug tree-optimization/94920] Failure to optimize abs pattern from
 arithmetic with selected operands based on comparisons with 0
Date: Thu, 21 Jul 2022 21:27:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94920

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Sam Feifer <sfeifer@gcc.gnu.org>:

https://gcc.gnu.org/g:633e9920589ddfaf2d6da1c24ce99b18a2638db4

commit r13-1785-g633e9920589ddfaf2d6da1c24ce99b18a2638db4
Author: Sam Feifer <sfeifer@redhat.com>
Date:   Thu Jul 21 16:31:41 2022 -0400

    match.pd: Add new abs pattern [PR94920]

    This patch is intended to fix a missed optimization in match.pd. It
optimizes (x >=3D 0 ? x : 0) + (x <=3D 0 ? -x : 0) to just abs(x). Addition=
ally,
the pattern (x <=3D 0 ? -x : 0) now gets optimized to max(-x, 0), which hel=
ps
with the other simplification rule.

    Tests are also included to be added to the testsuite.

    Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?

            PR tree-optimization/94920

    gcc/ChangeLog:

            * match.pd (x >=3D 0 ? x : 0) + (x <=3D 0 ? -x : 0): New
simplification.
                       (x <=3D 0 ? -x : 0): New simplification.

    gcc/testsuite/ChangeLog:

            * g++.dg/pr94920-1.C: New test.
            * g++.dg/pr94920.C: New test.
            * gcc.dg/pr94920-2.c: New test.=