[turbofan] Optimize division/modulus by constant.

src/compiler/x64/instruction-selector-x64.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/generic-node-inl.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 528 matching lines @@
   VisitMul(this, node, kX64Imul32);
 }
 
 
 void InstructionSelector::VisitInt64Mul(Node* node) {
   if (TryEmitLeaMult(this, node, kX64Lea)) return;
   VisitMul(this, node, kX64Imul);
 }
 
 
+void InstructionSelector::VisitInt32MulHigh(Node* node) {
+  X64OperandGenerator g(this);
+  InstructionOperand* temps[] = {g.TempRegister(rax)};
+  size_t temp_count = arraysize(temps);
+  Emit(kX64ImulHigh32, g.DefineAsFixed(node, rdx),
+       g.UseFixed(node->InputAt(0), rax), g.UseRegister(node->InputAt(1)),
+       temp_count, temps);
+}
+
+
 static void VisitDiv(InstructionSelector* selector, Node* node,
                      ArchOpcode opcode) {
   X64OperandGenerator g(selector);
   InstructionOperand* temps[] = {g.TempRegister(rdx)};
   selector->Emit(
       opcode, g.DefineAsFixed(node, rax), g.UseFixed(node->InputAt(0), rax),
       g.UseUniqueRegister(node->InputAt(1)), arraysize(temps), temps);
 }
 
 
@@ skipping 480 matching lines @@
 
 
 void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kUnorderedLessThanOrEqual, node);
   VisitFloat64Compare(this, node, &cont);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8