[Bug tree-optimization/89296] [7/8/9 Regression] tree copy-header masking uninitialized warning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89296

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Feb 18 12:56:15 2019
New Revision: 268986

URL: https://gcc.gnu.org/viewcvs?rev=268986&root=gcc&view=rev
Log:
2019-02-18  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/89296
        * tree-ssa-loop-ch.c (ch_base::copy_headers): Restrict setting
        of no-warning flag to cases that might emit the bogus warning.

        * gcc.dg/uninit-pr89296.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/uninit-pr89296.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-ch.c