[Bug tree-optimization/47679] [4.9/5/6 Regression] Strange uninitialized warning after SRA

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679

--- Comment #31 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Sun Sep 20 06:37:39 2015
New Revision: 227942

URL: https://gcc.gnu.org/viewcvs?rev=227942&root=gcc&view=rev
Log:
[PATCH] Fix 47679 by improving jump threading

        PR tree-optimization/47679
        * tree-ssa-dom.c (record_temporary_equivalences): No longer static.
        * tree-ssa-dom.h (record_temporary_equivalences): Add prototype.
        * tree-ssa-threadedge.c: Include tree-ssa-dom.h.
        (thread_through_normal_block): Use record_temporary_equivalences.

        PR tree-optimization/47679
        * g++.dg/warn/Wuninitialized-6.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wuninitialized-6.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-ssa-dom.h
    trunk/gcc/tree-ssa-threadedge.c