// Copyright (c) 2016, the R8 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.
package com.android.tools.r8.ir.code;

import com.android.tools.r8.code.UshrInt;
import com.android.tools.r8.code.UshrInt2Addr;
import com.android.tools.r8.code.UshrIntLit8;
import com.android.tools.r8.code.UshrLong;
import com.android.tools.r8.code.UshrLong2Addr;
import com.android.tools.r8.errors.Unreachable;
import org.objectweb.asm.Opcodes;

public class Ushr extends LogicalBinop {

  public Ushr(NumericType type, Value dest, Value left, Value right) {
    super(type, dest, left, right);
  }

  @Override
  boolean fitsInDexInstruction(Value value) {
    // The ushr instruction only has the /lit8 variant.
    return fitsInLit8Instruction(value);
  }

  @Override
  public boolean isUshr() {
    return true;
  }

  @Override
  public Ushr asUshr() {
    return this;
  }

  @Override
  public boolean isCommutative() {
    return false;
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateInt(int dest, int left, int right) {
    return new UshrInt(dest, left, right);
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateLong(int dest, int left, int right) {
    return new UshrLong(dest, left, right);
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateInt2Addr(int left, int right) {
    return new UshrInt2Addr(left, right);
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateLong2Addr(int left, int right) {
    return new UshrLong2Addr(left, right);
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateIntLit8(int dest, int left, int constant) {
    return new UshrIntLit8(dest, left, constant);
  }

  @Override
  public com.android.tools.r8.code.Instruction CreateIntLit16(int dest, int left, int constant) {
    throw new Unreachable("Unsupported instruction ShrIntLit16");
  }

  @Override
  public boolean identicalNonValueNonPositionParts(Instruction other) {
    return other.asUshr().type == type;
  }

  @Override
  public int compareNonValueParts(Instruction other) {
    return type.ordinal() - other.asUshr().type.ordinal();
  }

  @Override
  int foldIntegers(int left, int right) {
    return left >>> right;
  }

  @Override
  long foldLongs(long left, long right) {
    return left >>> right;
  }

  @Override
  int getCfOpcode() {
    switch (type) {
      case BYTE:
      case CHAR:
      case SHORT:
      case INT:
        return Opcodes.IUSHR;
      case LONG:
        return Opcodes.LUSHR;
      default:
        throw new Unreachable("Unexpected numeric type in shift: " + type);
    }
  }
}