X87: [turbofan] Add TruncationMode for TruncateFloat64ToInt32.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index 7dda86efdc61150eaa41cae3eebdc88f163cf166..d350738e0b32e084cd42e43b255aedfb632bf0f1 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -647,6 +647,23 @@ void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToInt32(Node* node) {
+  X87OperandGenerator g(this);
+
+  switch (TruncationModeOf(node->op())) {
+    case TruncationMode::kJavaScript:
+      Emit(kArchTruncateDoubleToI, g.DefineAsRegister(node),
+           g.Use(node->InputAt(0)));
+      return;
+    case TruncationMode::kRoundToZero:
+      Emit(kX87Float64ToInt32, g.DefineAsRegister(node),
+           g.Use(node->InputAt(0)));
+      return;
+  }
+  UNREACHABLE();
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));