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re PR tree-optimization/43679 (ice in gen_lsm_tmp_name, at tree-ssa-loop-im.c:1812)

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2010-04-08  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/43679
	* tree-ssa-pre.c (eliminate): Only propagate copies.

	* gcc.c-torture/compile/pr43679.c: New testcase.

From-SVN: r158112
This commit is contained in:
Richard Guenther 2010-04-08 10:21:23 +00:00 committed by Richard Biener
parent 5a905a2b23
commit 84ae6d7ba5
4 changed files with 46 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2010-04-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43679
* tree-ssa-pre.c (eliminate): Only propagate copies.
2010-04-08 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/43681

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-04-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43679
* gcc.c-torture/compile/pr43679.c: New testcase.
2010-04-08 Jakub Jelinek <jakub@redhat.com>
PR debug/43670

33
gcc/testsuite/gcc.c-torture/compile/pr43679.c Normal file
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@ -0,0 +1,33 @@
unsigned g_5;
int g_7;
int g_23[2];
int *g_29 = &g_23[0];
int **g_59;
unsigned long g_186;
int foo (int, int);
int bar (int);
void func_37 (long p_38)
{
int *l_39 = &g_7;
*l_39 = (*l_39
||
(foo
(((*g_29 != *l_39, ((bar (g_59 != &l_39), 0), 0))),
0)));
foo (*l_39, 0);
int **l_256 = &l_39;
{
for (0; g_186; 0)
{
*l_256 = *l_256;
if (g_5)
goto lbl_270;
*l_39 &= 0;
}
}
lbl_270:
;
}

5
gcc/tree-ssa-pre.c
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@ -4341,15 +4341,16 @@ eliminate (void)
for (i = 0; VEC_iterate (gimple, to_remove, i, stmt); ++i)
{
tree lhs = gimple_assign_lhs (stmt);
tree rhs = gimple_assign_rhs1 (stmt);
use_operand_p use_p;
gimple use_stmt;
/* If there is a single use only, propagate the equivalency
instead of keeping the copy. */
if (TREE_CODE (lhs) == SSA_NAME
&& TREE_CODE (rhs) == SSA_NAME
&& single_imm_use (lhs, &use_p, &use_stmt)
&& may_propagate_copy (USE_FROM_PTR (use_p),
gimple_assign_rhs1 (stmt)))
&& may_propagate_copy (USE_FROM_PTR (use_p), rhs))
{
SET_USE (use_p, gimple_assign_rhs1 (stmt));
update_stmt (use_stmt);