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[Bug tree-optimization/52943] [4.7/4.8 Regression] likely wrong code bug caused by predictive commoning
- 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, 12 Apr 2012 11:39:12 +0000
- Subject: [Bug tree-optimization/52943] [4.7/4.8 Regression] likely wrong code bug caused by predictive commoning
- Auto-submitted: auto-generated
- References: <bug-52943-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52943
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-12 11:39:12 UTC ---
Author: rguenth
Date: Thu Apr 12 11:38:47 2012
New Revision: 186374
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186374
Log:
2012-04-12 Richard Guenther <rguenther@suse.de>
PR tree-optimization/52943
* tree-chrec.h (chrec_is_positive): Remove.
* tree-scalar-evolution.c (chrec_is_positive): Move ...
* tree-data-ref.c (chrec_is_positive): ... here. Make static.
Return false for a constant zero instead of negative.
(analyze_siv_subscript_cst_affine): Handle zero difference
in the initial condition explicitely.
* gcc.dg/torture/pr52943.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr52943.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-chrec.h
trunk/gcc/tree-data-ref.c
trunk/gcc/tree-scalar-evolution.c