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[Bug tree-optimization/49770] [4.7 Regression] wrong code with -fno-tree-forwprop
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 21 Jul 2011 13:19:34 +0000
- Subject: [Bug tree-optimization/49770] [4.7 Regression] wrong code with -fno-tree-forwprop
- Auto-submitted: auto-generated
- References: <bug-49770-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49770
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-07-21 13:19:27 UTC ---
Author: rguenth
Date: Thu Jul 21 13:19:18 2011
New Revision: 176567
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176567
Log:
2011-07-21 Richard Guenther <rguenther@suse.de>
PR tree-optimization/49770
* tree-ssa-sccvn.c (valueize_refs_1): Return whether we
valueized any operand. Renamed from ...
(valueize_refs): ... this. New wrapper around valueize_refs_1.
(valueize_shared_reference_ops_from_ref): Return whether we
valueized any operand.
(vn_reference_lookup): Only when we valueized any operand
use the valueized reference for alias analysis. Do not preserve
the original reference tree in this case.
* g++.dg/torture/pr49770.C: New testcase.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr49770.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-sccvn.c