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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/ShiftDecoder.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
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 }