[Bug c/84607] [6/7/8 Regression] Side effects discarded in address computation inside 'if'

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84607

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Feb 28 13:40:41 2018
New Revision: 258061

URL: https://gcc.gnu.org/viewcvs?rev=258061&root=gcc&view=rev
Log:
2018-02-28  Richard Biener  <rguenther@suse.de>

        PR middle-end/84607
        * genmatch.c (capture_info::walk_match): Do not mark
        captured expressions without operands as expr_p given
        they act more like predicates and should be subject to
        "lost tail" side-effect preserving.

        * gcc.dg/pr84607.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr84607.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/genmatch.c
    trunk/gcc/testsuite/ChangeLog