[Bug tree-optimization/52943] [4.7/4.8 Regression] likely wrong code bug caused by predictive commoning
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Apr 12 12:52:00 GMT 2012
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52943
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-12 12:50:30 UTC ---
Author: rguenth
Date: Thu Apr 12 12:50:22 2012
New Revision: 186377
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186377
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:
branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr52943.c
Modified:
branches/gcc-4_7-branch/gcc/ChangeLog
branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
branches/gcc-4_7-branch/gcc/tree-chrec.h
branches/gcc-4_7-branch/gcc/tree-data-ref.c
branches/gcc-4_7-branch/gcc/tree-scalar-evolution.c
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