| /* |
| * Copyright 2002 Sun Microsystems, Inc. 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. |
| * |
| * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.asm.sparc; |
| |
| import sun.jvm.hotspot.asm.*; |
| |
| class V9ShiftDecoder extends InstructionDecoder |
| implements V9InstructionDecoder { |
| final int op3; |
| final String name; |
| final int rtlOperation; |
| |
| V9ShiftDecoder(int op3, String name, int rtlOperation) { |
| this.op3 = op3; |
| this.name = name; |
| this.rtlOperation = rtlOperation; |
| } |
| |
| static boolean isXBitSet(int instruction) { |
| return (instruction & X_MASK) != 0; |
| } |
| |
| Instruction decode(int instruction, |
| SPARCInstructionFactory factory) { |
| SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction)); |
| SPARCRegister rd = SPARCRegisters.getRegister(getDestinationRegister(instruction)); |
| boolean xBit = isXBitSet(instruction); |
| ImmediateOrRegister operand2 = null; |
| |
| if (isIBitSet(instruction)) { |
| // look for 64 bits shift operations. |
| int value = instruction & ( xBit ? SHIFT_COUNT_6_MASK : SHIFT_COUNT_5_MASK); |
| operand2 = new Immediate(new Short((short) value)); |
| } else { |
| operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction)); |
| } |
| |
| return factory.newShiftInstruction(xBit? name + "x" : name, op3, rtlOperation, rs1, operand2, rd); |
| } |
| } |