Fix ICE caused by rounoff error in ipa-inline-analysis

Fix ICE caused by rounoff error in ipa-inline-analysis

[Jan Hubicka]

Hi,
the following patch silence overactive sanity check which now fires due to roundoff
errors of sreals.  Because this affects some bootstraps I am commiting it tonight.
I will add testcase tomorrow. My apologizes for the breakage.

Bootstrapped/regtested x86_64-linux.

Honza

	* ipa-inline-analysis.c (estimate_node_size_and_time): Allow rondoff
	errors when comparing specialized and unspecialized times.
Index: ipa-inline-analysis.c
===================================================================
--- ipa-inline-analysis.c	(revision 247436)
+++ ipa-inline-analysis.c	(working copy)
@@ -3422,7 +3422,15 @@ estimate_node_size_and_time (struct cgra
   min_size = (*info->entry)[0].size;
   gcc_checking_assert (size >= 0);
   gcc_checking_assert (time >= 0);
-  gcc_checking_assert (nonspecialized_time >= time);
+  /* nonspecialized_time should be always bigger than specialized time.
+     Roundoff issues however may get into the way.  */
+  gcc_checking_assert ((nonspecialized_time - time) >= -1);
+
+  /* Roundoff issues may make specialized time bigger than nonspecialized
+     time.  We do not really want that to happen because some heurstics
+     may get confused by seeing negative speedups.  */
+  if (time > nonspecialized_time)
+    time = nonspecialized_time;
 
   if (info->loop_iterations
       && !evaluate_predicate (info->loop_iterations, possible_truths))