Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9ShiftDecoder.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9ShiftDecoder.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,62 @@ +/* + * 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); + } +}