re PR tree-optimization/26667 (Inlining always_inline functions causes further…

re PR tree-optimization/26667 (Inlining always_inline functions causes further inlining that reduces function size to fail)

2006-03-14  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/26667
	* ipa-inline.c (cgraph_check_inline_limits): Walk the correct
	node for the callees.  Always allow inlining if it will shrink
	the function size.

From-SVN: r112049

gcc/ChangeLog

 2006-03-14  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/26667
+	* ipa-inline.c (cgraph_check_inline_limits): Walk the correct
+	node for the callees.  Always allow inlining if it will shrink
+	the function size.
+
+2006-03-14  Richard Guenther  <rguenther@suse.de>
+
 	PR middle-end/26659
 	* builtins.c (get_pointer_alignment): Prefer alignment
 	information from decls over that from types.

gcc/ipa-inline.c

@@ -254,13 +254,13 @@ cgraph_check_inline_limits (struct cgraph_node *to, struct cgraph_node *what,
   int newsize;
   int limit;
 
-  if (to->global.inlined_to)
-    to = to->global.inlined_to;
-
   for (e = to->callees; e; e = e->next_callee)
     if (e->callee == what)
       times++;
 
+  if (to->global.inlined_to)
+    to = to->global.inlined_to;
+
   /* When inlining large function body called once into small function,
      take the inlined function as base for limiting the growth.  */
   if (to->local.self_insns > what->local.self_insns)
@@ -270,8 +270,11 @@ cgraph_check_inline_limits (struct cgraph_node *to, struct cgraph_node *what,
 
   limit += limit * PARAM_VALUE (PARAM_LARGE_FUNCTION_GROWTH) / 100;
 
+  /* Check the size after inlining against the function limits.  But allow
+     the function to shrink if it went over the limits by forced inlining.  */
   newsize = cgraph_estimate_size_after_inlining (times, to, what);
-  if (newsize > PARAM_VALUE (PARAM_LARGE_FUNCTION_INSNS)
+  if (newsize >= to->global.insns
+      && newsize > PARAM_VALUE (PARAM_LARGE_FUNCTION_INSNS)
       && newsize > limit)
     {
       if (reason)