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[Bug tree-optimization/32044] [4.3/4.4 Regression] final value replacement too aggressive for e.g. targets with no native div/mod insns
- From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Dec 2008 20:34:11 -0000
- Subject: [Bug tree-optimization/32044] [4.3/4.4 Regression] final value replacement too aggressive for e.g. targets with no native div/mod insns
- References: <bug-32044-11706@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #65 from rakdver at gcc dot gnu dot org 2008-12-12 20:34 -------
Subject: Bug 32044
Author: rakdver
Date: Fri Dec 12 20:32:47 2008
New Revision: 142719
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=142719
Log:
PR tree-optimization/32044
* tree-scalar-evolution.h (expression_expensive_p): Declare.
* tree-scalar-evolution.c (expression_expensive_p): New function.
(scev_const_prop): Avoid introducing expensive expressions.
* tree-ssa-loop-ivopts.c (may_eliminate_iv): Ditto.
* gcc.dg/pr34027-1.c: Change outcome.
* gcc.dg/tree-ssa/pr32044.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/pr34027-1.c
trunk/gcc/tree-scalar-evolution.c
trunk/gcc/tree-scalar-evolution.h
trunk/gcc/tree-ssa-loop-ivopts.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32044