Avoid scanning all stmts outside of loops in LIM

The following avoids scanning stmts outside of loops for possibly
not returning calls.

	* tree-ssa-loop-im.cc (fill_always_executed_in): Skip
	blocks not in loops when looking for possibly not returning
	calls.

diff --git a/gcc/tree-ssa-loop-im.cc b/gcc/tree-ssa-loop-im.cc
index 0340857058bb76a7fe8be664af2d5d1943333259..4c0a46f93e63e8b3fbd9cf1621c53d5604045e3c 100644 (file)
--- a/gcc/tree-ssa-loop-im.cc
+++ b/gcc/tree-ssa-loop-im.cc
@@ -3534,6 +3534,12 @@ fill_always_executed_in (void)
   bitmap_clear (contains_call);
   FOR_EACH_BB_FN (bb, cfun)
     {
+      if (loop_depth (bb->loop_father) == 0)
+       {
+         /* Outside of loops we can skip scanning all stmts.  */
+         bitmap_set_bit (contains_call, bb->index);
+         continue;
+       }
       gimple_stmt_iterator gsi;
       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
        {