[turbofan] Changed TruncateFloat64ToInt64 to TryTruncateFloat64ToInt64.

src/compiler/arm64/instruction-selector-arm64.cc

 // Copyright 2014 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/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1224 matching lines @@
 void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
   VisitRR(this, kArm64Float64ToUint32, node);
 }
 
 
 void InstructionSelector::VisitTruncateFloat32ToInt64(Node* node) {
   VisitRR(this, kArm64Float32ToInt64, node);
 }
 
 
-void InstructionSelector::VisitTruncateFloat64ToInt64(Node* node) {
-  VisitRR(this, kArm64Float64ToInt64, node);
+void InstructionSelector::VisitTryTruncateFloat64ToInt64(Node* node) {
+  Arm64OperandGenerator g(this);
+
+  Constant int64min(INT64_MIN);

[Rodolph Perfetta (ARM), 2015/12/07 11:19:47]

those are not needed anymore

[ahaas, 2015/12/07 11:54:50]

Done, thanks for looking at the code so carefully. 

+  Constant int64max(INT64_MAX);
+  InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0)),
+                                 sequence()->AddImmediate(int64min),
+                                 sequence()->AddImmediate(int64max)};
+  InstructionOperand outputs[2];
+  size_t output_count = 0;
+  size_t input_count = 1;
+  outputs[output_count++] = g.DefineAsRegister(node);
+
+  Node* success_output = NodeProperties::FindProjection(node, 1);
+  if (success_output) {
+    outputs[output_count++] = g.DefineAsRegister(success_output);
+    input_count = 3;
+  }
+
+  Emit(kArm64Float64ToInt64, output_count, outputs, input_count, inputs);
 }
 
 
 void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
   VisitRR(this, kArm64Float32ToUint64, node);
 }
 
 
 void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
   VisitRR(this, kArm64Float64ToUint64, node);
@@ skipping 853 matching lines @@
          MachineOperatorBuilder::kFloat32RoundTiesEven |
          MachineOperatorBuilder::kFloat64RoundTiesEven |
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8