tree-ssa-sink.c (nearest_common_dominator_of_uses): Look at a PHI argument where…

tree-ssa-sink.c (nearest_common_dominator_of_uses): Look at a PHI argument where a use occurs instead of all PHI arguments.

	* tree-ssa-sink.c (nearest_common_dominator_of_uses): Look at
	a PHI argument where a use occurs instead of all PHI arguments.

From-SVN: r97738

gcc/ChangeLog

+2005-04-06  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* tree-ssa-sink.c (nearest_common_dominator_of_uses): Look at
+	a PHI argument where a use occurs instead of all PHI arguments.
+
 2005-04-06  Joseph S. Myers  <joseph@codesourcery.com>
 
 	* c-decl.c (finish_decl): Apply pending #pragma weak regardless of

gcc/tree-ssa-sink.c

@@ -240,10 +240,10 @@ nearest_common_dominator_of_uses (tree stmt)
 	  basic_block useblock;
 	  if (TREE_CODE (usestmt) == PHI_NODE)
 	    {
-	      int j;
-	      for (j = 0; j < PHI_NUM_ARGS (usestmt); j++)
+	      int idx = PHI_ARG_INDEX_FROM_USE (use_p);
+	      if (PHI_ARG_DEF (usestmt, idx) == var)
 		{
-		  useblock = PHI_ARG_EDGE (usestmt, j)->src;
+		  useblock = PHI_ARG_EDGE (usestmt, idx)->src;
 		  /* Short circuit. Nothing dominates the entry block.  */
 		  if (useblock == ENTRY_BLOCK_PTR)
 		    {