re PR target/41279 (252.eon performance regression)

	PR target/41279
	* cfgloopanal.c (num_loop_insns): Don't increment ninsns for each bb
	before insn counting loop now that BB_END (bb) is counted.  Ensure
	the return value isn't zero.

From-SVN: r152324

gcc/ChangeLog

+2009-09-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/41279
+	* cfgloopanal.c (num_loop_insns): Don't increment ninsns for each bb
+	before insn counting loop now that BB_END (bb) is counted.  Ensure
+	the return value isn't zero.
+
 2009-09-30  Nick Clifton  <nickc@redhat.com>
 
 	* config.gcc (sh-symbianelf): Replace definition of extra_objs

gcc/cfgloopanal.c

@@ -175,12 +175,14 @@ num_loop_insns (const struct loop *loop)
   for (i = 0; i < loop->num_nodes; i++)
     {
       bb = bbs[i];
-      ninsns++;
       FOR_BB_INSNS (bb, insn)
 	if (NONDEBUG_INSN_P (insn))
 	  ninsns++;
     }
-  free(bbs);
+  free (bbs);
+
+  if (!ninsns)
+    ninsns = 1;	/* To avoid division by zero.  */
 
   return ninsns;
 }
@@ -209,7 +211,7 @@ average_num_loop_insns (const struct loop *loop)
 	      : (bb->frequency * BB_FREQ_MAX) / loop->header->frequency;
       ninsns += binsns * ratio;
     }
-  free(bbs);
+  free (bbs);
 
   ninsns /= BB_FREQ_MAX;
   if (!ninsns)