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re PR tree-optimization/33302 (dead-store not eliminated)

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2007-09-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/33302
	* tree-ssa-dse.c (tree_ssa_dse): Connect infinite loops
	to the exit block before doing the post-dominator walk.
	* domwalk.c (walk_dominator_tree): The exit block is
	interesting even if it is not reachable.

	* gcc.dg/tree-ssa/ssa-dse-11.c: New testcase.

From-SVN: r128180
This commit is contained in:
Richard Guenther 2007-09-06 09:05:58 +00:00 committed by Richard Biener
parent 47de45c6fc
commit 515f36ebd9
4 changed files with 35 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-09-06 Richard Guenther <rguenther@suse.de>
PR tree-optimization/33302
* domwalk.c (walk_dominator_tree): The exit block is
interesting even if it is not reachable.
2007-09-06 Richard Sandiford <richard@codesourcery.com>
PR middle-end/33306

4
gcc/domwalk.c
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@ -151,7 +151,9 @@ walk_dominator_tree (struct dom_walk_data *walk_data, basic_block bb)
while (true)
{
/* Don't worry about unreachable blocks. */
if (EDGE_COUNT (bb->preds) > 0 || bb == ENTRY_BLOCK_PTR)
if (EDGE_COUNT (bb->preds) > 0
|| bb == ENTRY_BLOCK_PTR
|| bb == EXIT_BLOCK_PTR)
{
/* If block BB is not interesting to the caller, then none of the
callbacks that walk the statements in BB are going to be

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-09-06 Richard Guenther <rguenther@suse.de>
PR tree-optimization/33302
* gcc.dg/tree-ssa/ssa-dse-11.c: New testcase.
2007-09-06 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libfortran/33225

21
gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-11.c Normal file
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@ -0,0 +1,21 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-dse1-details" } */
extern void abort(void);
void foo(int *p)
{
while (1)
{
*p = 0;
*p = 0;
}
}
void bar(int *p)
{
*p = 0;
*p = 0;
abort ();
}
/* { dg-final { scan-tree-dump-times "Deleted dead store" 2 "dse1" } } */
/* { dg-final { cleanup-tree-dump "dse1" } } */