[turbofan] Add TruncateFloat64ToInt32 machine operator.

src/compiler/instruction-selector.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.h"
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/pipeline.h"
@@ skipping 569 matching lines @@
     case IrOpcode::kChangeUint32ToFloat64:
       return MarkAsDouble(node), VisitChangeUint32ToFloat64(node);
     case IrOpcode::kChangeFloat64ToInt32:
       return VisitChangeFloat64ToInt32(node);
     case IrOpcode::kChangeFloat64ToUint32:
       return VisitChangeFloat64ToUint32(node);
     case IrOpcode::kChangeInt32ToInt64:
       return VisitChangeInt32ToInt64(node);
     case IrOpcode::kChangeUint32ToUint64:
       return VisitChangeUint32ToUint64(node);
+    case IrOpcode::kTruncateFloat64ToInt32:
+      return VisitTruncateFloat64ToInt32(node);
     case IrOpcode::kTruncateInt64ToInt32:
       return VisitTruncateInt64ToInt32(node);
     case IrOpcode::kFloat64Add:
       return MarkAsDouble(node), VisitFloat64Add(node);
     case IrOpcode::kFloat64Sub:
       return MarkAsDouble(node), VisitFloat64Sub(node);
     case IrOpcode::kFloat64Mul:
       return MarkAsDouble(node), VisitFloat64Mul(node);
     case IrOpcode::kFloat64Div:
       return MarkAsDouble(node), VisitFloat64Div(node);
@@ skipping 83 matching lines @@
   VisitWord64Compare(node, &cont);
 }
 
 
 void InstructionSelector::VisitInt64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kSignedLessThanOrEqual, node);
   VisitWord64Compare(node, &cont);
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+  OperandGenerator g(this);
+  Emit(kArchTruncateDoubleToI, g.DefineAsRegister(node),
+       g.UseDoubleRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitFloat64Equal(Node* node) {
   FlagsContinuation cont(kUnorderedEqual, node);
   VisitFloat64Compare(node, &cont);
 }
 
 
 void InstructionSelector::VisitFloat64LessThan(Node* node) {
   FlagsContinuation cont(kUnorderedLessThan, node);
   VisitFloat64Compare(node, &cont);
 }
@@ skipping 355 matching lines @@
 
 
 void InstructionSelector::VisitCall(Node* call, BasicBlock* continuation,
                                     BasicBlock* deoptimization) {}
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8