Collect type feedback on result of Math.[round|ceil|floor]

src/type-feedback-vector.cc

Index: src/type-feedback-vector.cc
diff --git a/src/type-feedback-vector.cc b/src/type-feedback-vector.cc
index 3cf81f8c5f16228f2fece4935adcfe77e722b446..9b03e0fc1b513f4ed79a83324eaa878751658101 100644
--- a/src/type-feedback-vector.cc
+++ b/src/type-feedback-vector.cc
@@ -4,6 +4,7 @@
 
 #include "src/v8.h"
 
+#include "src/code-stubs.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-state.h"
 #include "src/objects.h"
@@ -312,7 +313,9 @@ InlineCacheState CallICNexus::StateFromFeedback() const {
   Isolate* isolate = GetIsolate();
   Object* feedback = GetFeedback();
   DCHECK(!FLAG_vector_ics ||
-         GetFeedbackExtra() == *vector()->UninitializedSentinel(isolate));
+         GetFeedbackExtra() == *vector()->UninitializedSentinel(isolate) ||
+         GetFeedbackExtra() ==
+             Smi::FromInt(CallICStub::kHasReturnedMinusZeroSentinel));

[mvstanton, 2015/05/04 09:41:22]

I like this tight control of expectations, thx!

[danno, 2015/05/04 14:31:56]

Acknowledged.

 
   if (feedback == *vector()->MegamorphicSentinel(isolate)) {
     return GENERIC;
@@ -343,6 +346,14 @@ void CallICNexus::ConfigureMonomorphicArray() {
 }
 
 
+void CallICNexus::ConfigureMonomorphicMathFunction(
+    Handle<JSFunction> function) {
+  Handle<WeakCell> new_cell = GetIsolate()->factory()->NewWeakCell(function);
+  SetFeedback(*new_cell);
+  SetFeedbackExtra(*vector()->UninitializedSentinel(GetIsolate()));
+}
+
+
 void CallICNexus::ConfigureUninitialized() {
   SetFeedback(*vector()->UninitializedSentinel(GetIsolate()),
               SKIP_WRITE_BARRIER);