[turbofan] Change TruncateFloat32ToInt64 to TryTruncateFloat32ToInt64.

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 832 matching lines @@
   }
   VisitRR(this, kMips64TruncWD, node);
 }
 
 
 void InstructionSelector::VisitChangeFloat64ToUint32(Node* node) {
   VisitRR(this, kMips64TruncUwD, node);
 }
 
 
-void InstructionSelector::VisitTruncateFloat32ToInt64(Node* node) {
-  VisitRR(this, kMips64TruncLS, node);
+void InstructionSelector::VisitTryTruncateFloat32ToInt64(Node* node) {
+  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);
+  }
+
+  this->Emit(kMips64TruncLS, output_count, outputs, 1, inputs);
 }
 
 
 void InstructionSelector::VisitTryTruncateFloat64ToInt64(Node* node) {
   Mips64OperandGenerator g(this);
   InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0))};
   InstructionOperand outputs[2];
   size_t output_count = 0;
   outputs[output_count++] = g.DefineAsRegister(node);
 
@@ skipping 657 matching lines @@
           Node* const node = value->InputAt(0);
           Node* const result = NodeProperties::FindProjection(node, 0);
           if (result == NULL || selector->IsDefined(result)) {
             switch (node->opcode()) {
               case IrOpcode::kInt32AddWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kMips64Dadd, cont);
               case IrOpcode::kInt32SubWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kMips64Dsub, cont);
+              case IrOpcode::kTryTruncateFloat32ToInt64:

[titzer, 2015/12/09 11:40:35]

Drop this case as per explanation on other CL.

+                return VisitTryTruncFloat32ToInt64(selector, result);
               default:
                 break;
             }
           }
         }
         break;
       case IrOpcode::kWord32And:
       case IrOpcode::kWord64And:
         return VisitWordCompare(selector, value, kMips64Tst, cont, true);
       default:
@@ skipping 212 matching lines @@
          MachineOperatorBuilder::kFloat32RoundUp |
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat32RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesEven |
          MachineOperatorBuilder::kFloat32RoundTiesEven;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8