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re PR tree-optimization/21001 (VRP is weak when the tested variable in a COND_EXPR is used only in the COND_EXPR.)

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gcc/
	PR tree-optimization/21001
	* tree-optimize.c (init_tree_optimization_passes): Move the
	first pass_forwprop immediately before pass_vrp.

testsuite/
	PR tree-optimization/21001
	* gcc.dg/tree-ssa/pr21001.c: New.

From-SVN: r98309
This commit is contained in:
Kazu Hirata 2005-04-18 06:10:45 +00:00 committed by Kazu Hirata
parent 0ec7a4d1ee
commit 0d21c2a2fe
4 changed files with 32 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-04-18 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/21001
* tree-optimize.c (init_tree_optimization_passes): Move the
first pass_forwprop immediately before pass_vrp.
2005-04-17 Ian Lance Taylor <ian@airs.com>
* c-common.def (SIZEOF_EXPR, ARROW_EXPR, ALIGNOF_EXPR): Remove.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2005-04-18 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/21001
* gcc.dg/tree-ssa/pr21001.c: New.
2005-04-17 Thomas Koenig <Thomas.Koenig@online.de>
PR libfortran/21075

20
gcc/testsuite/gcc.dg/tree-ssa/pr21001.c Normal file
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@ -0,0 +1,20 @@
/* PR tree-optimization/21001
VRP did not insert ASSERT_EXPRs when the variable tested in a
COND_EXPR is a single-use variable. By propagating the definition
of the single-use variable into the COND_EXPR, we can get useful
range infomation out of the conditional. */
/* { dg-do compile } */
/* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-vrp-details" } */
int
foo (int a)
{
int b = a != 0;
if (b)
if (a != 0)
return 1;
return 0;
}
/* { dg-final { scan-tree-dump-times "Folding predicate" 1 "vrp"} } */

2
gcc/tree-optimize.c
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@ -356,9 +356,9 @@ init_tree_optimization_passes (void)
NEXT_PASS (pass_dominator);
NEXT_PASS (pass_copy_prop);
NEXT_PASS (pass_dce);
NEXT_PASS (pass_forwprop);
NEXT_PASS (pass_vrp);
NEXT_PASS (pass_merge_phi);
NEXT_PASS (pass_forwprop);
NEXT_PASS (pass_phiopt);
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_tail_recursion);