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re PR tree-optimization/36009 (PRE causes missed loop store motion, store sinking doesn't work)

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2008-05-15  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36009
	PR tree-optimization/36204
	* tree-ssa-loop-im.c (tree-ssa-propagate.h): Include.
	(determine_invariantness_stmt): Record the loop a store is
	always executed in.
	* Makefile.in (tree-ssa-loop-im.o): Add tree-ssa-propagate.h
	dependency.

	* gcc.dg/tree-ssa/ssa-lim-5.c: New testcase.
	* gcc.dg/tree-ssa/ssa-lim-6.c: Likewise..

From-SVN: r135330
This commit is contained in:
Richard Guenther 2008-05-15 08:37:22 +00:00 committed by Richard Biener
parent 45ff5edaea
commit 8ded35f90c
6 changed files with 66 additions and 1 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2008-05-15 Richard Guenther <rguenther@suse.de>
PR tree-optimization/36009
PR tree-optimization/36204
* tree-ssa-loop-im.c (tree-ssa-propagate.h): Include.
(determine_invariantness_stmt): Record the loop a store is
always executed in.
* Makefile.in (tree-ssa-loop-im.o): Add tree-ssa-propagate.h
dependency.
2008-05-15 Richard Guenther <rguenther@suse.de>
PR tree-optimization/34330

2
gcc/Makefile.in
View File

@ -2206,7 +2206,7 @@ tree-ssa-loop-im.o : tree-ssa-loop-im.c $(TREE_FLOW_H) $(CONFIG_H) \
$(SYSTEM_H) $(RTL_H) $(TREE_H) $(TM_P_H) $(CFGLOOP_H) domwalk.h \
$(PARAMS_H) output.h $(DIAGNOSTIC_H) $(TIMEVAR_H) $(TM_H) coretypes.h \
$(TREE_DUMP_H) tree-pass.h $(FLAGS_H) $(REAL_H) $(BASIC_BLOCK_H) \
hard-reg-set.h
hard-reg-set.h tree-ssa-propagate.h
tree-ssa-math-opts.o : tree-ssa-math-opts.c $(TREE_FLOW_H) $(CONFIG_H) \
$(SYSTEM_H) $(TREE_H) $(TIMEVAR_H) tree-pass.h $(TM_H) $(FLAGS_H) \
alloc-pool.h $(BASIC_BLOCK_H) $(TARGET_H)

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2008-05-15 Richard Guenther <rguenther@suse.de>
PR tree-optimization/36009
PR tree-optimization/36204
* gcc.dg/tree-ssa/ssa-lim-5.c: New testcase.
* gcc.dg/tree-ssa/ssa-lim-6.c: Likewise..
2008-05-15 Richard Guenther <rguenther@suse.de>
PR tree-optimization/34330

25
gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-5.c Normal file
View File

@ -0,0 +1,25 @@
/* { dg-do link } */
/* { dg-options "-O" } */
/* We should apply store motion here. */
struct BUF1
{
int b1;
int b12;
};
void link_error();
int foo(struct BUF1 * p)
{
int i = 0;
for (i = 0; i < 1024*1024; i++)
p->b1 = 1;
if (p->b1 != 1)
link_error ();
return 0;
}
int main() { return 0; }

14
gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-6.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-lim-details" } */
double a[16][64], y[64], x[16];
void foo(void)
{
int i, j;
for (j = 0; j < 64; ++j)
for (i = 0; i < 16; ++i)
y[j] = y[j] + a[i][j] * x[i];
}
/* { dg-final { scan-tree-dump "Executing store motion of y" "lim" } } */
/* { dg-final { cleanup-tree-dump "lim" } } */

9
gcc/tree-ssa-loop-im.c
View File

@ -40,6 +40,7 @@ along with GCC; see the file COPYING3. If not see
#include "hashtab.h"
#include "tree-affine.h"
#include "pointer-set.h"
#include "tree-ssa-propagate.h"
/* TODO: Support for predicated code motion. I.e.
@ -900,6 +901,14 @@ determine_invariantness_stmt (struct dom_walk_data *dw_data ATTRIBUTE_UNUSED,
maybe_never = true;
outermost = NULL;
}
/* Make sure to note always_executed_in for stores to make
store-motion work. */
else if (stmt_makes_single_store (stmt))
{
stmt_ann (stmt)->common.aux
= xcalloc (1, sizeof (struct lim_aux_data));
LIM_DATA (stmt)->always_executed_in = outermost;
}
continue;
}