re PR tree-optimization/32087 (ICE with FORTRAN and -fprefetch-loop-arrays)

	PR tree-optimization/32087
	* tree-ssa-loop-manip.c (tree_transform_and_unroll_loop):
	Do not call scale_bbs_frequencies_int with prob of zero.

From-SVN: r126959

gcc/ChangeLog

+2007-07-26  Steve Ellcey  <sje@cup.hp.com>
+
+	PR tree-optimization/32087
+	* tree-ssa-loop-manip.c (tree_transform_and_unroll_loop):
+	Do not call scale_bbs_frequencies_int with prob of zero.
+
 2007-07-26  Julian Brown  <julian@codesourcery.com>
 
 	* config/arm/arm-protos.h (neon_lane_bounds, neon_const_bounds)

gcc/tree-ssa-loop-manip.c

@@ -1035,8 +1035,9 @@ tree_transform_and_unroll_loop (struct loop *loop, unsigned factor,
   new_nonexit->count = exit_bb->count - new_exit->count;
   if (new_nonexit->count < 0)
     new_nonexit->count = 0;
-  scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability,
-			     prob);
+  if (prob > 0)
+    scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability,
+			       prob);
 
   /* Finally create the new counter for number of iterations and add the new
      exit instruction.  */