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[Bug tree-optimization/41778] missed dead store elimination
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Oct 2009 09:34:59 -0000
- Subject: [Bug tree-optimization/41778] missed dead store elimination
- References: <bug-41778-17659@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from rguenth at gcc dot gnu dot org 2009-10-23 09:34 -------
Subject: Bug 41778
Author: rguenth
Date: Fri Oct 23 09:34:46 2009
New Revision: 153491
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=153491
Log:
2009-10-23 Richard Guenther <rguenther@suse.de>
PR tree-optimization/41778
* tree-ssa-pre.c (do_regular_insertion): Only insert if a
redundancy along a path in the CFG we want to optimize for speed
is going to be removed.
(execute_pre): Do partial-PRE only if the function is to be
optimized for speed.
(gate_pre): Do not turn off all of PRE when not optimizing a
function for speed.
* gcc.dg/tree-ssa/ssa-pre-26.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-26.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41778