[turbofan] Changed TruncateFloat64ToInt64 to TryTruncateFloat64ToInt64.

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

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index ce16050e1c3b210da19279aba93a6e80fb921753..545ebe9ea63ac42a911917b4a44982a2f1030764 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1242,8 +1242,26 @@ void InstructionSelector::VisitTruncateFloat32ToInt64(Node* 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);
 }