Optimize num::~/, num::>> and num::<< for some cases.

sdk/lib/_internal/compiler/implementation/ssa/nodes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 abstract class HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
@@ skipping 47 matching lines @@
   R visitShiftRight(HShiftRight node);
   R visitStatic(HStatic node);
   R visitStaticStore(HStaticStore node);
   R visitStringConcat(HStringConcat node);
   R visitStringify(HStringify node);
   R visitSubtract(HSubtract node);
   R visitSwitch(HSwitch node);
   R visitThis(HThis node);
   R visitThrow(HThrow node);
   R visitThrowExpression(HThrowExpression node);
+  R visitTruncatingDivide(HTruncatingDivide node);
   R visitTry(HTry node);
   R visitTypeConversion(HTypeConversion node);
   R visitTypeKnown(HTypeKnown node);
   R visitReadTypeVariable(HReadTypeVariable node);
   R visitFunctionType(HFunctionType node);
   R visitVoidType(HVoidType node);
   R visitInterfaceType(HInterfaceType node);
   R visitDynamicType(HDynamicType node);
 }
 
@@ skipping 246 matching lines @@
   visitShiftRight(HShiftRight node) => visitBinaryBitOp(node);
   visitSubtract(HSubtract node) => visitBinaryArithmetic(node);
   visitSwitch(HSwitch node) => visitControlFlow(node);
   visitStatic(HStatic node) => visitInstruction(node);
   visitStaticStore(HStaticStore node) => visitInstruction(node);
   visitStringConcat(HStringConcat node) => visitInstruction(node);
   visitStringify(HStringify node) => visitInstruction(node);
   visitThis(HThis node) => visitParameterValue(node);
   visitThrow(HThrow node) => visitControlFlow(node);
   visitThrowExpression(HThrowExpression node) => visitInstruction(node);
+  visitTruncatingDivide(HTruncatingDivide node) => visitBinaryArithmetic(node);
   visitTry(HTry node) => visitControlFlow(node);
   visitIs(HIs node) => visitInstruction(node);
   visitTypeConversion(HTypeConversion node) => visitCheck(node);
   visitTypeKnown(HTypeKnown node) => visitCheck(node);
   visitReadTypeVariable(HReadTypeVariable node) => visitInstruction(node);
   visitFunctionType(HFunctionType node) => visitInstruction(node);
   visitVoidType(HVoidType node) => visitInstruction(node);
   visitInterfaceType(HInterfaceType node) => visitInstruction(node);
   visitDynamicType(HDynamicType node) => visitInstruction(node);
 }
@@ skipping 447 matching lines @@
   static const int INVOKE_STATIC_TYPECODE = 26;
   static const int INDEX_TYPECODE = 27;
   static const int IS_TYPECODE = 28;
   static const int INVOKE_DYNAMIC_TYPECODE = 29;
   static const int SHIFT_RIGHT_TYPECODE = 30;
   static const int READ_TYPE_VARIABLE_TYPECODE = 31;
   static const int FUNCTION_TYPE_TYPECODE = 32;
   static const int VOID_TYPE_TYPECODE = 33;
   static const int INTERFACE_TYPE_TYPECODE = 34;
   static const int DYNAMIC_TYPE_TYPECODE = 35;
+  static const int TRUNCATING_DIVIDE_TYPECODE = 36;
 
   HInstruction(this.inputs, this.instructionType)
       : id = idCounter++, usedBy = <HInstruction>[] {
     assert(inputs.every((e) => e != null));
   }
 
   int get hashCode => id;
 
   bool useGvn() => _useGvn;
   void setUseGvn() { _useGvn = true; }
@@ skipping 861 matching lines @@
   HSubtract(left, right, selector, type) : super(left, right, selector, type);
   accept(HVisitor visitor) => visitor.visitSubtract(this);
 
   BinaryOperation operation(ConstantSystem constantSystem)
       => constantSystem.subtract;
   int typeCode() => HInstruction.SUBTRACT_TYPECODE;
   bool typeEquals(other) => other is HSubtract;
   bool dataEquals(HInstruction other) => true;
 }
 
+class HTruncatingDivide extends HBinaryArithmetic {
+  HTruncatingDivide(left, right, selector, type)
+      : super(left, right, selector, type);
+  accept(HVisitor visitor) => visitor.visitTruncatingDivide(this);
+
+  BinaryOperation operation(ConstantSystem constantSystem)
+      => constantSystem.truncatingDivide;
+  int typeCode() => HInstruction.TRUNCATING_DIVIDE_TYPECODE;
+  bool typeEquals(other) => other is HTruncatingDivide;
+  bool dataEquals(HInstruction other) => true;
+}
+
 /**
  * An [HSwitch] instruction has one input for the incoming
  * value, and one input per constant that it can switch on.
  * Its block has one successor per constant, and one for the default.
  */
 class HSwitch extends HControlFlow {
   HSwitch(List<HInstruction> inputs) : super(inputs);
 
   HConstant constant(int index) => inputs[index + 1];
   HInstruction get expression => inputs[0];
@@ skipping 1192 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }