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view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9ShiftDecoder.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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/* * 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); } }