[PATCH] Change the badness computation to ensure no integer-underflow

[Dehao Chen]

This patch prevents integer-underflow of badness computation in ipa-inline.

Bootstrapped and passed regression tests.

OK for trunk?

Thanks,
Dehao

gcc/ChangeLog:
2013-06-21  Dehao Chen  <de...@google.com>

        * ipa-inline.c (edge_badness): Fix integer underflow.

Index: gcc/ipa-inline.c
===================================================================
--- gcc/ipa-inline.c (revision 200326)
+++ gcc/ipa-inline.c (working copy)
@@ -888,11 +888,9 @@ edge_badness (struct cgraph_edge *edge, bool dump)
   else if (max_count)
     {
       int relbenefit = relative_time_benefit (callee_info, edge, edge_time);
-      badness =
- ((int)
- ((double) edge->count * INT_MIN / 2 / max_count /
RELATIVE_TIME_BENEFIT_RANGE) *
- relbenefit) / growth;
-
+      badness = ((int)((double) edge->count / max_count
+  * relbenefit / RELATIVE_TIME_BENEFIT_RANGE * INT_MIN / 2)) / growth;
+
       /* Be sure that insanity of the profile won't lead to increasing counts
  in the scalling and thus to overflow in the computation above.  */
       gcc_assert (max_count >= edge->count);