PR profile/24093 (negative counts)

[Jan Hubicka]

Hi,
this patch fixes the other half of problem.  It turns out that the
profile missmatch produced by recursive inlining (that is avoidable but
likely not worthwhile) propagate into negative counts that in general
might happen in other cases too (due to roundoff errors), so I just
added code checking it.

Bootstrapped/regtested i686-pc-gnu-linux, comitted.

2005-10-31  Jan Hubicka  <jh@suse.cz>
	PR middle-end/24093
	* cgraph.c (cgraph_clone_edge, cgraph_clone_node): Watch negative
	counts.
Index: cgraph.c
===================================================================
--- cgraph.c	(revision 106281)
+++ cgraph.c	(working copy)
@@ -895,7 +895,11 @@ cgraph_clone_edge (struct cgraph_edge *e
 
   new->inline_failed = e->inline_failed;
   if (update_original)
-    e->count -= new->count;
+    {
+      e->count -= new->count;
+      if (e->count < 0)
+	e->count = 0;
+    }
   return new;
 }
 
@@ -931,7 +935,11 @@ cgraph_clone_node (struct cgraph_node *n
   else
     count_scale = 0;
   if (update_original)
-    n->count -= count;
+    {
+      n->count -= count;
+      if (n->count < 0)
+	n->count = 0;
+    }
 
   for (e = n->callees;e; e=e->next_callee)
     cgraph_clone_edge (e, new, e->call_stmt, count_scale, loop_nest,