1 /* 2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.asm.sparc; 26 27 import sun.jvm.hotspot.asm.*; 28 29 class ShiftDecoder extends InstructionDecoder { 30 final int op3; 31 final String name; 32 final int rtlOperation; 33 34 ShiftDecoder(int op3, String name, int rtlOperation) { 35 this.op3 = op3; 36 this.name = name; 37 this.rtlOperation = rtlOperation; 38 } 39 40 private ImmediateOrRegister getShiftLength(int instruction) { 41 boolean iBit = isIBitSet(instruction); 42 ImmediateOrRegister operand2 = null; 43 if (iBit) { 44 int value = instruction & SHIFT_COUNT_5_MASK; 45 operand2 = new Immediate(new Short((short)value)); 46 } else { 47 operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction)); 48 } 49 return operand2; 50 } 51 52 Instruction decode(int instruction, 53 SPARCInstructionFactory factory) { 54 SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction)); 55 SPARCRegister rd = SPARCRegisters.getRegister(getDestinationRegister(instruction)); 56 ImmediateOrRegister operand2 = getShiftLength(instruction); 57 return factory.newShiftInstruction(name, op3, rtlOperation, rs1, operand2, rd); 58 } 59 }