tree-cfg.c (tree_forwarder_block_p): Speed up by walking through the statements backward.

	* tree-cfg.c (tree_forwarder_block_p): Speed up by walking
	through the statements backward.

From-SVN: r93768

gcc/ChangeLog

@@ -2,6 +2,9 @@
 
 	* tree-cfg.c (tree_can_merge_blocks_p): Reorder two checks.
 
+	* tree-cfg.c (tree_forwarder_block_p): Speed up by walking
+	through the statements backward.
+
 2005-01-17  Ian Lance Taylor  <ian@airs.com>
 
 	PR middle-end/13127:

gcc/tree-cfg.c

@@ -3911,9 +3911,9 @@ tree_forwarder_block_p (basic_block bb)
   gcc_assert (bb != ENTRY_BLOCK_PTR);
 #endif
 
-  /* Now walk through the statements.  We can ignore labels, anything else
-     means this is not a forwarder block.  */
-  for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+  /* Now walk through the statements backward.  We can ignore labels,
+     anything else means this is not a forwarder block.  */
+  for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_next (&bsi))
     {
       tree stmt = bsi_stmt (bsi);