[turbofan] Optimize division/modulus by constant.

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"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 728 matching lines @@
       Emit(kArm64Mneg, g.DefineAsRegister(node), g.UseRegister(m.left().node()),
            g.UseRegister(mright.right().node()));
       return;
     }
   }
 
   VisitRRR(this, kArm64Mul, node);
 }
 
 
+void InstructionSelector::VisitInt32MulHigh(Node* node) {
+  // TODO(arm64): Can we do better here?
+  Arm64OperandGenerator g(this);
+  InstructionOperand* const smull_operand = g.TempRegister();
+  Emit(kArm64Smull, smull_operand, g.UseRegister(node->InputAt(0)),
+       g.UseRegister(node->InputAt(1)));
+  Emit(kArm64Asr, g.DefineAsRegister(node), smull_operand, g.TempImmediate(32));
+}
+
+
 void InstructionSelector::VisitInt32Div(Node* node) {
   VisitRRR(this, kArm64Idiv32, node);
 }
 
 
 void InstructionSelector::VisitInt64Div(Node* node) {
   VisitRRR(this, kArm64Idiv, node);
 }
 
 
@@ skipping 510 matching lines @@
 
 
 void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kUnorderedLessThanOrEqual, node);
   VisitFloat64Compare(this, node, &cont);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8