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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/19832] don't remove an if when we know the
 value is the same as with the if (subtraction)
Date: Fri, 01 Sep 2023 06:58:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D19832

--- Comment #11 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:3d86e7f4a8aef1b864a51660825597eafe9059b1

commit r14-3606-g3d86e7f4a8aef1b864a51660825597eafe9059b1
Author: Andrew Pinski <apinski@marvell.com>
Date:   Wed Aug 30 21:21:01 2023 -0700

    MATCH [PR19832]: Optimize some `(a !=3D b) ? a OP b : c`

    This patch adds the following match patterns to optimize these:
     /* (a !=3D b) ? (a - b) : 0 -> (a - b) */
     /* (a !=3D b) ? (a ^ b) : 0 -> (a ^ b) */
     /* (a !=3D b) ? (a & b) : a -> (a & b) */
     /* (a !=3D b) ? (a | b) : a -> (a | b) */
     /* (a !=3D b) ? min(a,b) : a -> min(a,b) */
     /* (a !=3D b) ? max(a,b) : a -> max(a,b) */
     /* (a !=3D b) ? (a * b) : (a * a) -> (a * b) */
     /* (a !=3D b) ? (a + b) : (a + a) -> (a + b) */
     /* (a !=3D b) ? (a + b) : (2 * a) -> (a + b) */
    Note currently only integer types (include vector types)
    are handled. Floating point types can be added later on.

    OK? Bootstrapped and tested on x86_64-linux-gnu.

    The first pattern had still shows up in GCC in cse.c's preferable
    function which was the original motivation for this patch.

            PR tree-optimization/19832

    gcc/ChangeLog:

            * match.pd: Add pattern to optimize
            `(a !=3D b) ? a OP b : c`.

    gcc/testsuite/ChangeLog:

            * g++.dg/opt/vectcond-1.C: New test.
            * gcc.dg/tree-ssa/phi-opt-same-1.c: New test.=