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re PR tree-optimization/51246 (ICE in replace_ref_with, at tree-predcom.c:1309) 

PR tree-optimization/51246
	* tree-predcom.c (replace_ref_with): Handle also clobber on the
	rhs.

	* gcc.c-torture/compile/pr51246.c: New test.

From-SVN: r181884
This commit is contained in:
Jakub Jelinek 2011-12-01 18:03:33 +01:00 committed by Jakub Jelinek
parent 0397b96547
commit 7e8b1c4bd8
4 changed files with 34 additions and 1 deletions
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4
gcc/ChangeLog
View File

@ -1,5 +1,9 @@
2011-12-01 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/51246
* tree-predcom.c (replace_ref_with): Handle also clobber on the
rhs.
PR rtl-optimization/51014
* loop-unroll.c (apply_opt_in_copies): Ignore label DEBUG_INSNs
both from bb and orig_bb.

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2011-12-01 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/51246
* gcc.c-torture/compile/pr51246.c: New test.
PR rtl-optimization/51014
* g++.dg/opt/pr51014.C: New test.

14
gcc/testsuite/gcc.c-torture/compile/pr51246.c Normal file
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@ -0,0 +1,14 @@
/* PR tree-optimization/51246 */
int a, *b;
void
test (void)
{
while (1)
{
int c;
a = c;
b = &c;
}
}

14
gcc/tree-predcom.c
View File

@ -1306,8 +1306,20 @@ replace_ref_with (gimple stmt, tree new_tree, bool set, bool in_lhs)
val = gimple_assign_lhs (stmt);
if (TREE_CODE (val) != SSA_NAME)
{
gcc_assert (gimple_assign_copy_p (stmt));
val = gimple_assign_rhs1 (stmt);
gcc_assert (gimple_assign_single_p (stmt));
if (TREE_CLOBBER_P (val))
{
val = gimple_default_def (cfun, SSA_NAME_VAR (new_tree));
if (val == NULL_TREE)
{
val = make_ssa_name (SSA_NAME_VAR (new_tree),
gimple_build_nop ());
set_default_def (SSA_NAME_VAR (new_tree), val);
}
}
else
gcc_assert (gimple_assign_copy_p (stmt));
}
}
else