MIPS64: [turbofan] Change TruncateFloat64ToUint64 to TryTruncateFloatToUint64.

src/compiler/mips64/instruction-selector-mips64.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/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 859 matching lines @@
   Emit(kMips64TruncLD, output_count, outputs, 1, inputs);
 }
 
 
 void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
   VisitRR(this, kMips64TruncUlS, node);
 }
 
 
 void InstructionSelector::VisitTryTruncateFloat64ToUint64(Node* node) {
-  if (NodeProperties::FindProjection(node, 1)) {
-    // TODO(mips): implement the second return value.
-    UNIMPLEMENTED();
+  Mips64OperandGenerator g(this);
+
+  InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0))};
+  InstructionOperand outputs[2];
+  size_t output_count = 0;
+  outputs[output_count++] = g.DefineAsRegister(node);
+
+  Node* success_output = NodeProperties::FindProjection(node, 1);
+  if (success_output) {
+    outputs[output_count++] = g.DefineAsRegister(success_output);
   }
-  VisitRR(this, kMips64TruncUlD, node);
+
+  Emit(kMips64TruncUlD, output_count, outputs, 1, inputs);
 }
 
 
 void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
   Mips64OperandGenerator g(this);
   Emit(kMips64Shl, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)),
        g.TempImmediate(0));
 }
 
 
@@ skipping 861 matching lines @@
          MachineOperatorBuilder::kFloat32RoundUp |
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat32RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesEven |
          MachineOperatorBuilder::kFloat32RoundTiesEven;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8