r174066 - in /trunk/gcc: ChangeLog testsuite/Ch...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Mon May 23 12:08:41 2011
New Revision: 174066

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174066
Log:
2011-05-23  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49115
	* tree-ssa-alias.c (stmt_kills_ref_p_1): If the assignment
	is not necessarily carried out, do not claim it kills the ref.
	* tree-ssa-dce.c (mark_aliased_reaching_defs_necessary_1): Likewise.

	* g++.dg/torture/pr49115.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr49115.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-dce.c