[turbofan] Initial support for the %_DateField intrinsic.

src/compiler/js-intrinsic-lowering.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
@@ skipping 14 matching lines @@
 
 
 Reduction JSIntrinsicLowering::Reduce(Node* node) {
   if (node->opcode() != IrOpcode::kJSCallRuntime) return NoChange();
   const Runtime::Function* const f =
       Runtime::FunctionForId(CallRuntimeParametersOf(node->op()).id());
   if (f->intrinsic_type != Runtime::IntrinsicType::INLINE) return NoChange();
   switch (f->function_id) {
     case Runtime::kInlineConstructDouble:
       return ReduceConstructDouble(node);
+    case Runtime::kInlineDateField:
+      return ReduceDateField(node);
     case Runtime::kInlineDeoptimizeNow:
       return ReduceDeoptimizeNow(node);
     case Runtime::kInlineDoubleHi:
       return ReduceDoubleHi(node);
     case Runtime::kInlineDoubleLo:
       return ReduceDoubleLo(node);
     case Runtime::kInlineHeapObjectGetMap:
       return ReduceHeapObjectGetMap(node);
     case Runtime::kInlineIncrementStatsCounter:
       return ReduceIncrementStatsCounter(node);
@@ skipping 54 matching lines @@
   Node* value =
       graph()->NewNode(machine()->Float64InsertHighWord32(),
                        graph()->NewNode(machine()->Float64InsertLowWord32(),
                                         jsgraph()->Constant(0), low),
                        high);
   ReplaceWithValue(node, value);
   return Replace(value);
 }
 
 
+Reduction JSIntrinsicLowering::ReduceDateField(Node* node) {
+  Node* const value = NodeProperties::GetValueInput(node, 0);
+  Node* const index = NodeProperties::GetValueInput(node, 1);
+  Node* const effect = NodeProperties::GetEffectInput(node);
+  Node* const control = NodeProperties::GetControlInput(node);
+  NumberMatcher mindex(index);
+  if (mindex.Is(JSDate::kDateValue)) {
+    return Change(
+        node,
+        simplified()->LoadField(AccessBuilder::ForJSDateField(
+            static_cast<JSDate::FieldIndex>(static_cast<int>(mindex.Value())))),
+        value, effect, control);
+  }
+  // TODO(turbofan): Optimize more patterns.
+  return NoChange();
+}
+
+
 Reduction JSIntrinsicLowering::ReduceDeoptimizeNow(Node* node) {
   if (mode() != kDeoptimizationEnabled) return NoChange();
   Node* frame_state = NodeProperties::GetFrameStateInput(node, 0);
   DCHECK_EQ(frame_state->opcode(), IrOpcode::kFrameState);
 
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
 
   // We are making the continuation after the call dead. To
   // model this, we generate if (true) statement with deopt
@@ skipping 400 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSIntrinsicLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8