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Subject: [Bug tree-optimization/100221] Takes two passes at DSE to remove
 some dead stores
Date: Tue, 24 May 2022 06:20:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100221

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:1adf11822bd48f4d65156b7642514630c08c4d00

commit r13-723-g1adf11822bd48f4d65156b7642514630c08c4d00
Author: Richard Biener <rguenther@suse.de>
Date:   Fri May 20 12:24:40 2022 +0200

    tree-optimization/100221 - improve DSE a bit

    When facing multiple PHI defs and one feeding the other we can
    postpone processing uses of one and thus can proceed.

    2022-05-20  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100221
            * tree-ssa-dse.cc (contains_phi_arg): New function.
            (dse_classify_store): Postpone PHI defs that feed another PHI in
defs.

            * gcc.dg/tree-ssa/ssa-dse-44.c: New testcase.
            * gcc.dg/tree-ssa/ssa-dse-45.c: Likewise.=