Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and

src/compiler/js-builtin-reducer.cc

Index: src/compiler/js-builtin-reducer.cc
diff --git a/src/compiler/js-builtin-reducer.cc b/src/compiler/js-builtin-reducer.cc
index ec73742fd241d39ad9ab65adab625832d99fbf44..cfc4e1e10c3974df98c293c7e4a69aa478e557c9 100644
--- a/src/compiler/js-builtin-reducer.cc
+++ b/src/compiler/js-builtin-reducer.cc
@@ -191,9 +191,34 @@ Reduction JSBuiltinReducer::ReduceMathFround(Node* node) {
 }
 
 
-Reduction JSBuiltinReducer::Reduce(Node* node) {
+// ES6 draft 10-14-14, section 20.2.2.16.
+Reduction JSBuiltinReducer::ReduceMathFloor(Node* node) {
+  if (!machine()->HasFloat64Floor()) return NoChange();
   JSCallReduction r(node);
+  if (r.InputsMatchOne(Type::Number())) {
+    // Math.floor(a:number) -> Float64Floor(a)
+    Node* value = graph()->NewNode(machine()->Float64Floor(), r.left());
+    return Replace(value);
+  }
+  return NoChange();
+}
+
 
+// ES6 draft 10-14-14, section 20.2.2.10.
+Reduction JSBuiltinReducer::ReduceMathCeil(Node* node) {
+  if (!machine()->HasFloat64Ceil()) return NoChange();
+  JSCallReduction r(node);
+  if (r.InputsMatchOne(Type::Number())) {
+    // Math.ceil(a:number) -> Float64Ceil(a)
+    Node* value = graph()->NewNode(machine()->Float64Ceil(), r.left());
+    return Replace(value);
+  }
+  return NoChange();
+}
+
+
+Reduction JSBuiltinReducer::Reduce(Node* node) {
+  JSCallReduction r(node);
   // Dispatch according to the BuiltinFunctionId if present.
   if (!r.HasBuiltinFunctionId()) return NoChange();
   switch (r.GetBuiltinFunctionId()) {
@@ -207,6 +232,10 @@ Reduction JSBuiltinReducer::Reduce(Node* node) {
       return ReplaceWithPureReduction(node, ReduceMathImul(node));
     case kMathFround:
       return ReplaceWithPureReduction(node, ReduceMathFround(node));
+    case kMathFloor:
+      return ReplaceWithPureReduction(node, ReduceMathFloor(node));
+    case kMathCeil:
+      return ReplaceWithPureReduction(node, ReduceMathCeil(node));
     default:
       break;
   }