* ipa-polymorphic-call.c

	(ipa_polymorphic_call_context::get_dynamic_type): Short circuit the
	case when call target is already known.

From-SVN: r223733

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 39d297d..5618d20 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-05-26  Jan Hubicka  <hubicka@ucw.cz>
+
+       * ipa-polymorphic-call.c
+       (ipa_polymorphic_call_context::get_dynamic_type): Short circuit the
+       case when call target is already known.
+
 2015-05-26  Oleg Endo  <olegendo@gcc.gnu.org>
 
        PR target/65979

diff --git a/gcc/ipa-polymorphic-call.c b/gcc/ipa-polymorphic-call.c
index b69f541..1a82bb7 100644 (file)
--- a/gcc/ipa-polymorphic-call.c
+++ b/gcc/ipa-polymorphic-call.c
@@ -1561,6 +1561,11 @@ ipa_polymorphic_call_context::get_dynamic_type (tree instance,
          ref = OBJ_TYPE_REF_EXPR (ref);
          ref = walk_ssa_copies (ref);
 
+         /* If call target is already known, no need to do the expensive
+            memory walk.  */
+         if (is_gimple_min_invariant (ref))
+           return false;
+
          /* Check if definition looks like vtable lookup.  */
          if (TREE_CODE (ref) == SSA_NAME
              && !SSA_NAME_IS_DEFAULT_DEF (ref)