text: /*
   * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package sun.tools.tree;
  
  import sun.tools.java.*;
  import sun.tools.asm.Assembler;
  import sun.tools.asm.Label;
  
  /**
   * WARNING: The contents of this source file are not part of any
   * supported API.  Code that depends on them does so at its own risk:
   * they are subject to change or removal without notice.
   */
  public
  class NotEqualExpression extends BinaryEqualityExpression {
      /**
       * constructor
       */
      public NotEqualExpression(long where, Expression left, Expression right) {
          super(NE, where, left, right);
      }
  
      /**
       * Evaluate
       */
      Expression eval(int a, int b) {
          return new BooleanExpression(where, a != b);
      }
      Expression eval(long a, long b) {
          return new BooleanExpression(where, a != b);
      }
      Expression eval(float a, float b) {
          return new BooleanExpression(where, a != b);
      }
      Expression eval(double a, double b) {
          return new BooleanExpression(where, a != b);
      }
      Expression eval(boolean a, boolean b) {
          return new BooleanExpression(where, a != b);
      }
  
      /**
       * Simplify
       */
      Expression simplify() {
          if (left.isConstant() && !right.isConstant()) {
              return new NotEqualExpression(where, right, left);
          }
          return this;
      }
  
      /**
       * Code
       */
      void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
          left.codeValue(env, ctx, asm);
          switch (left.type.getTypeCode()) {
            case TC_BOOLEAN:
            case TC_INT:
              if (!right.equals(0)) {
                  right.codeValue(env, ctx, asm);
                  asm.add(where, whenTrue ? opc_if_icmpne : opc_if_icmpeq, lbl, whenTrue);
                  return;
              }
              break;
            case TC_LONG:
              right.codeValue(env, ctx, asm);
              asm.add(where, opc_lcmp);
              break;
            case TC_FLOAT:
              right.codeValue(env, ctx, asm);
              asm.add(where, opc_fcmpl);
              break;
            case TC_DOUBLE:
              right.codeValue(env, ctx, asm);
              asm.add(where, opc_dcmpl);
              break;
            case TC_ARRAY:
            case TC_CLASS:
            case TC_NULL:
              if (right.equals(0)) {
                  asm.add(where, whenTrue ? opc_ifnonnull : opc_ifnull, lbl, whenTrue);
              } else {
                  right.codeValue(env, ctx, asm);
                  asm.add(where, whenTrue ? opc_if_acmpne : opc_if_acmpeq, lbl, whenTrue);
              }
              return;
            default:
              throw new CompilerError("Unexpected Type");
          }
          asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue);
      }
  }
  