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Fix PR43464: copyprop should maintain loop close phi nodes with multiple arguments.

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2010-03-30  Richard Guenther  <rguenther@suse.de>
	    Zdenek Dvorak  <ook@ucw.cz>
	    Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/43464
	* tree-ssa-copy.c (init_copy_prop): Handle loop close phi nodes
	with multiple arguments.
	(execute_copy_prop): Remove call to rewrite_into_loop_closed_ssa.

Co-Authored-By: Sebastian Pop <sebastian.pop@amd.com>
Co-Authored-By: Zdenek Dvorak <ook@ucw.cz>

From-SVN: r157889
This commit is contained in:
Richard Guenther 2010-03-31 18:37:41 +00:00 committed by Sebastian Pop
parent 40bf935e85
commit 3cbf7085c3
2 changed files with 23 additions and 6 deletions
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9
gcc/ChangeLog.graphite
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@ -1,3 +1,12 @@
2010-03-30 Richard Guenther <rguenther@suse.de>
Zdenek Dvorak <ook@ucw.cz>
Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/43464
* tree-ssa-copy.c (init_copy_prop): Handle loop close phi nodes
with multiple arguments.
(execute_copy_prop): Remove call to rewrite_into_loop_closed_ssa.
2010-03-23 Sebastian Pop <sebastian.pop@amd.com>
* graphite-dependences.c (print_pddr): Call print_pdr with an

20
gcc/tree-ssa-copy.c
View File

@ -749,6 +749,7 @@ init_copy_prop (void)
{
gimple_stmt_iterator si;
int depth = bb->loop_depth;
bool loop_exit_p = false;
for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
{
@ -786,6 +787,18 @@ init_copy_prop (void)
cached_last_copy_of[SSA_NAME_VERSION (def)] = def;
}
/* In loop-closed SSA form do not copy-propagate through
PHI nodes in blocks with a loop exit edge predecessor. */
if (current_loops
&& loops_state_satisfies_p (LOOP_CLOSED_SSA))
{
edge_iterator ei;
edge e;
FOR_EACH_EDGE (e, ei, bb->preds)
if (loop_exit_edge_p (e->src->loop_father, e))
loop_exit_p = true;
}
for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
{
gimple phi = gsi_stmt (si);
@ -793,12 +806,7 @@ init_copy_prop (void)
def = gimple_phi_result (phi);
if (!is_gimple_reg (def)
/* In loop-closed SSA form do not copy-propagate through
PHI nodes. Technically this is only needed for loop
exit PHIs, but this is difficult to query. */
|| (current_loops
&& gimple_phi_num_args (phi) == 1
&& loops_state_satisfies_p (LOOP_CLOSED_SSA)))
|| loop_exit_p)
prop_set_simulate_again (phi, false);
else
prop_set_simulate_again (phi, true);