2011-05-03  Tom de Vries  <tom@codesourcery.com>

	gcc/
	* stmt.c (set_jump_prob): Make robust against *inv_scale == 0.

=== modified file 'gcc/stmt.c'
--- old/gcc/stmt.c	2011-02-07 13:23:30 +0000
+++ new/gcc/stmt.c	2011-05-06 19:17:34 +0000
@@ -2312,7 +2312,9 @@
 set_jump_prob (rtx jump, int prob, int *inv_scale)
 {
   /* j[i] = p[i] * scale / REG_BR_PROB_BASE.  */
-  int jump_prob = prob * REG_BR_PROB_BASE / *inv_scale;
+  int jump_prob = (*inv_scale > 0
+                   ? prob * REG_BR_PROB_BASE / *inv_scale
+                   : REG_BR_PROB_BASE / 2);
   /* f[i] = REG_BR_PROB_BASE - j[i].  */
   int fallthrough_prob = REG_BR_PROB_BASE - jump_prob;