Fix loop distribution bug with merging edges that creates too many edges.

gcc/
	* tree-loop-distribution.c (pg_add_dependence_edges): Return 2 if
	this_dir is 2.  Check for this_dir non-zero before dir != this_dir
	check.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242038 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 4 insertions, 2 deletions

diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c
index 5580f286ccfc..902cf30b78a2 100644
--- a/gcc/tree-loop-distribution.c
+++ b/gcc/tree-loop-distribution.c
@@ -1408,9 +1408,11 @@ pg_add_dependence_edges (struct graph *rdg, vec<loop_p> loops, int dir,
 	else
 	  this_dir = 0;
 	free_dependence_relation (ddr);
-	if (dir == 0)
+	if (this_dir == 2)
+	  return 2;
+	else if (dir == 0)
 	  dir = this_dir;
-	else if (dir != this_dir)
+	else if (this_dir != 0 && dir != this_dir)
 	  return 2;
 	/* Shuffle "back" dr1.  */
 	dr1 = saved_dr1;