diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bac2003e3ea..6f8967fe617 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2002-01-07  Jakub Jelinek  <jakub@redhat.com>
+
+	* predict.c (combine_predictions_for_insn): Avoid division by zero.
+
 2002-01-07  Jakub Jelinek  <jakub@redhat.com>
 
 	* simplify-rtx.c (simplify_plus_minus): Bump n_ops for NOT.
diff --git a/gcc/predict.c b/gcc/predict.c
index 71da61a7c17..c35837ed2b7 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -253,8 +253,12 @@ combine_predictions_for_insn (insn, bb)
 	     * (REG_BR_PROB_BASE - probability));
 
 	/* Use FP math to avoid overflows of 32bit integers.  */
-	combined_probability = (((double) combined_probability) * probability
-				* REG_BR_PROB_BASE / d + 0.5);
+	if (d == 0)
+	  /* If one probability is 0% and one 100%, avoid division by zero.  */
+	  combined_probability = REG_BR_PROB_BASE / 2;
+	else
+	  combined_probability = (((double) combined_probability) * probability
+				  * REG_BR_PROB_BASE / d + 0.5);
       }
 
   /* Decide which heuristic to use.  In case we didn't match anything,