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tree-ssa-dom.c (dom_opt_finalize_block): Fix conditions to determine whether or not to try and thread outgoing edges. 

* tree-ssa-dom.c (dom_opt_finalize_block): Fix conditions to
	determine whether or not to try and thread outgoing edges.

From-SVN: r105091
This commit is contained in:
Jeff Law 2005-10-07 10:05:37 -06:00 committed by Jeff Law
parent a5cee4808e
commit 3e352c00e1
2 changed files with 15 additions and 12 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-10-07 Jeff Law <law@redhat.com>
* tree-ssa-dom.c (dom_opt_finalize_block): Fix conditions to
determine whether or not to try and thread outgoing edges.
2005-10-07 David Edelsohn <edelsohn@gnu.org>
* config/rs6000/rs6000.md (eqsi_power): New.

22
gcc/tree-ssa-dom.c
View File

@ -1020,14 +1020,14 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
{
tree last;
/* If we are at a leaf node in the dominator tree, see if we can thread
the edge from BB through its successor.
Do this before we remove entries from our equivalence tables. */
/* If we have an outgoing edge to a block with multiple incoming and
outgoing edges, then we may be able to thread the edge. ie, we
may be able to statically determine which of the outgoing edges
will be traversed when the incoming edge from BB is traversed. */
if (single_succ_p (bb)
&& (single_succ_edge (bb)->flags & EDGE_ABNORMAL) == 0
&& (get_immediate_dominator (CDI_DOMINATORS, single_succ (bb)) != bb
|| phi_nodes (single_succ (bb))))
&& !single_pred_p (single_succ (bb))
&& !single_succ_p (single_succ (bb)))
{
thread_across_edge (walk_data, single_succ_edge (bb));
@ -1044,10 +1044,9 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
extract_true_false_edges_from_block (bb, &true_edge, &false_edge);
/* If the THEN arm is the end of a dominator tree or has PHI nodes,
then try to thread through its edge. */
if (get_immediate_dominator (CDI_DOMINATORS, true_edge->dest) != bb
|| phi_nodes (true_edge->dest))
/* Only try to thread the edge if it reaches a target block with
more than one predecessor and more than one successor. */
if (!single_pred_p (true_edge->dest) && !single_succ_p (true_edge->dest))
{
struct edge_info *edge_info;
unsigned int i;
@ -1094,8 +1093,7 @@ dom_opt_finalize_block (struct dom_walk_data *walk_data, basic_block bb)
}
/* Similarly for the ELSE arm. */
if (get_immediate_dominator (CDI_DOMINATORS, false_edge->dest) != bb
|| phi_nodes (false_edge->dest))
if (!single_pred_p (false_edge->dest) && !single_succ_p (false_edge->dest))
{
struct edge_info *edge_info;
unsigned int i;