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re PR tree-optimization/46177 (ICE: in prop_phis, at tree-loop-distribution.c:327 with -fno-tree-copy-prop -ftree-loop-distribution)

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2010-11-09  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/46177
	* tree-loop-distribution.c (prop_phis): Remove.
	(generate_builtin): Re-use the old loop exit edge to avoid
	needing to update PHI nodes.

	* gcc.dg/pr46177-2.c: New testcase.

From-SVN: r166492
This commit is contained in:
Richard Guenther 2010-11-09 15:01:41 +00:00 committed by Richard Biener
parent a8869bde32
commit 5923c6c37f
4 changed files with 36 additions and 29 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2010-11-09 Richard Guenther <rguenther@suse.de>
PR tree-optimization/46177
* tree-loop-distribution.c (prop_phis): Remove.
(generate_builtin): Re-use the old loop exit edge to avoid
needing to update PHI nodes.
2010-11-09 Joern Rennecke <amylaar@spamcop.net>
* ix86_expand_split_stack_prologue (args_size): Change type to

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-11-09 Richard Guenther <rguenther@suse.de>
PR tree-optimization/46177
* gcc.dg/pr46177-2.c: New testcase.
2010-11-09 Richard Guenther <rguenther@suse.de>
PR testsuite/46312

18
gcc/testsuite/gcc.dg/pr46177-2.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do compile } */
/* { dg-options "-O -fno-tree-copy-prop -ftree-loop-distribution" } */
int A[30], B[30];
void
foo (int j)
{
int i, k;
for (k = 0; k < 10; k++)
if (j)
{
for (; j < k; j++)
;
for (i = 0; i < k; i++)
A[i] = B[i] = 0;
}
}

35
gcc/tree-loop-distribution.c
View File

@ -311,31 +311,6 @@ generate_memset_zero (gimple stmt, tree op0, tree nb_iter,
return res;
}
/* Propagate phis in BB b to their uses and remove them. */
static void
prop_phis (basic_block b)
{
gimple_stmt_iterator psi;
for (psi = gsi_start_phis (b); !gsi_end_p (psi); )
{
gimple phi = gsi_stmt (psi);
tree def = gimple_phi_result (phi);
if (!is_gimple_reg (def))
mark_virtual_phi_result_for_renaming (phi);
else
{
tree use = gimple_phi_arg_def (phi, 0);
gcc_assert (gimple_phi_num_args (phi) == 1);
replace_uses_by (def, use);
}
remove_phi_node (&psi, true);
}
}
/* Tries to generate a builtin function for the instructions of LOOP
pointed to by the bits set in PARTITION. Returns true when the
operation succeeded. */
@ -405,11 +380,13 @@ generate_builtin (struct loop *loop, bitmap partition, bool copy_p)
if (res && !copy_p)
{
unsigned nbbs = loop->num_nodes;
basic_block src = loop_preheader_edge (loop)->src;
basic_block dest = single_exit (loop)->dest;
prop_phis (dest);
make_edge (src, dest, EDGE_FALLTHRU);
edge exit = single_exit (loop);
basic_block src = loop_preheader_edge (loop)->src, dest = exit->dest;
redirect_edge_pred (exit, src);
exit->flags &= ~(EDGE_TRUE_VALUE|EDGE_FALSE_VALUE);
exit->flags |= EDGE_FALLTHRU;
cancel_loop_tree (loop);
rescan_loop_exit (exit, false, true);
for (i = 0; i < nbbs; i++)
delete_basic_block (bbs[i]);