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Subject: [Bug tree-optimization/103228] [9/10/11/12 Regression] missed
 optimization with |^ at the gimple level
Date: Wed, 17 Nov 2021 23:40:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103228

--- Comment #7 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:32221357007666124409ec3ee0d3a1cf263ebc9e

commit r12-5358-g32221357007666124409ec3ee0d3a1cf263ebc9e
Author: Andrew Pinski <apinski@marvell.com>
Date:   Mon Nov 15 09:31:20 2021 +0000

    Fix PR tree-optimization/103228 and 103228: folding of (type) X op CST
where type is a nop convert

    Currently we fold (type) X op CST into (type) (X op ((type-x) CST)) when
the conversion widens
    but not when the conversion is a nop. For the same reason why we move t=
he
widening conversion
    (the possibility of removing an extra conversion), we should do the sam=
e if
the conversion is a
    nop.

    Committed as approved with the comment change.

            PR tree-optimization/103228
            PR tree-optimization/55177

    gcc/ChangeLog:

            * match.pd ((type) X bitop CST): Also do this
            transformation for nop conversions.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/pr103228-1.c: New test.
            * gcc.dg/tree-ssa/pr55177-1.c: New test.=