| /* |
| * 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 V9PopcDecoder extends InstructionDecoder |
| implements V9InstructionDecoder { |
| Instruction decode(int instruction, SPARCInstructionFactory factory) { |
| SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; |
| int rs1Num = getSourceRegister1(instruction); |
| Instruction instr = null; |
| // in POPC, rs1 should be zero. see page 205 - A.41 Population Count |
| if (rs1Num != 0) { |
| instr = v9factory.newIllegalInstruction(instruction); |
| } else { |
| SPARCRegister rd = SPARCRegisters.getRegister(getDestinationRegister(instruction)); |
| instr = v9factory.newV9PopcInstruction(getOperand2(instruction), rd); |
| } |
| return instr; |
| } |
| } |
