[turbofan] Add TruncationMode for TruncateFloat64ToInt32.

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 1219 matching lines @@
       return;
     }
     default:
       break;
   }
   Emit(kArm64Mov32, g.DefineAsRegister(node), g.UseRegister(value));
 }
 
 
 void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
-  Arm64OperandGenerator g(this);
-  Emit(kArm64Float64ToFloat32, g.DefineAsRegister(node),
-       g.UseRegister(node->InputAt(0)));
+  VisitRR(this, kArm64Float64ToFloat32, node);
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+  switch (TruncationModeOf(node->op())) {
+    case TruncationMode::kJavaScript:
+      return VisitRR(this, kArchTruncateDoubleToI, node);
+    case TruncationMode::kRoundToZero:
+      return VisitRR(this, kArm64Float64ToInt32, node);
+  }
+  UNREACHABLE();
+}
+
+
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   Arm64OperandGenerator g(this);
   Node* value = node->InputAt(0);
   if (CanCover(node, value) && value->InputCount() >= 2) {
     Int64BinopMatcher m(value);
     if ((m.IsWord64Sar() && m.right().HasValue() &&
          (m.right().Value() == 32)) ||
         (m.IsWord64Shr() && m.right().IsInRange(32, 63))) {
       Emit(kArm64Lsr, g.DefineAsRegister(node), g.UseRegister(m.left().node()),
            g.UseImmediate(m.right().node()));
@@ skipping 804 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8