[Bug tree-optimization/49115] invalid return value optimization (?) when exception is thrown and caught

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49115

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-23 
12:08:45 UTC ---
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  <rguent...@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