001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.compilers.common.assembler.ia32;
014    
015    /**
016     * Constants exported by the assembler
017     */
018    public interface AssemblerConstants {
019      String[] CONDITION =
020          {"O", "NO", "LLT", "LGE", "EQ", "NE", "LLE", "LGT", "S", "NS", "PE", "PO", "LT", "GE", "LE", "GT"};
021    
022      /** OF == 1 - overflow */
023      byte O = 0x0;
024      /** OF == 0 - not overflow */
025      byte NO = 0x1;
026      /** CF == 1 - logically less than (below) */
027      byte LLT = 0x2;
028      /** CF == 0 - logically greater than or equal (not below) */
029      byte LGE = 0x3;
030      /** ZF == 1 - equal (zero) */
031      byte EQ = 0x4;
032      /** ZF == 0 - not equal (not zero) */
033      byte NE = 0x5;
034      /**  CF == 1 or ZF == 1 - logically less than or equal (not above) */
035      byte LLE = 0x6;
036      /** CF == 0 and ZF == 0 - logically greater than (above) */
037      byte LGT = 0x7;
038      byte S = 0x8; // SF == 1 - (sign) negative??
039      byte NS = 0x9; // SF == 0 - (not sign) positive or zero??
040      /** PF == 1 - even parity or unordered floating point #s */
041      byte PE = 0xA;
042      /**  PF == 0 - odd parity or ordered floating point #s */
043      byte PO = 0xB;
044      /** SF != OF - less than */
045      byte LT = 0xC;
046      /** SF == OF - greater than or equal (not less than) */
047      byte GE = 0xD;
048      /** ZF == 1 or SF != OF - less than or equal (not greater than) */
049      byte LE = 0xE;
050      /** ZF == 0 and SF == OF - greater than */
051      byte GT = 0xF;
052    
053      // scale factors for SIB bytes
054      short BYTE = 0;
055      short SHORT = 1;
056      short WORD = 2;
057      short LONG = 3;
058    
059    }