[turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan for wasm.

src/compiler/x87/instruction-selector-x87.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/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
@@ skipping 879 matching lines @@
 }
 
 
 void InstructionSelector::VisitFloat32Sub(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(1)));
   Emit(kX87Float32Sub, g.DefineAsFixed(node, stX_0), 0, nullptr);
 }
 
+void InstructionSelector::VisitFloat32SubPreserveNan(Node* node) {
+  X87OperandGenerator g(this);
+  Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
+  Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(1)));
+  Emit(kX87Float32Sub, g.DefineAsFixed(node, stX_0), 0, nullptr);
+}
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87PushFloat64, g.NoOutput(), g.Use(node->InputAt(0)));
   Emit(kX87PushFloat64, g.NoOutput(), g.Use(node->InputAt(1)));
   Emit(kX87Float64Sub, g.DefineAsFixed(node, stX_0), 0, nullptr);
 }
 
+void InstructionSelector::VisitFloat64SubPreserveNan(Node* node) {
+  X87OperandGenerator g(this);
+  Emit(kX87PushFloat64, g.NoOutput(), g.Use(node->InputAt(0)));
+  Emit(kX87PushFloat64, g.NoOutput(), g.Use(node->InputAt(1)));
+  Emit(kX87Float64Sub, g.DefineAsFixed(node, stX_0), 0, nullptr);
+}
+
 
 void InstructionSelector::VisitFloat32Mul(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(1)));
   Emit(kX87Float32Mul, g.DefineAsFixed(node, stX_0), 0, nullptr);
 }
 
 
 void InstructionSelector::VisitFloat64Mul(Node* node) {
@@ skipping 783 matching lines @@
            MachineOperatorBuilder::kFloat32RoundTruncate |
            MachineOperatorBuilder::kFloat64RoundTruncate |
            MachineOperatorBuilder::kFloat32RoundTiesEven |
            MachineOperatorBuilder::kFloat64RoundTiesEven;
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8