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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/FloatDecoder.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 abstract class FloatDecoder extends InstructionDecoder {
30 final int opf;
31 final String name;
32 final int numSources; // 1 or 2;
33 final int src1Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
34 final int src2Type; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
35 final int resultType; // RTLDT_FL_SINGLE, _DOUBLE, _QUAD
36
37 FloatDecoder(int opf, String name, int src1Type, int src2Type, int resultType) {
38 this.opf = opf;
39 this.name = name;
40 numSources = 2;
41 this.src1Type = src1Type;
42 this.src2Type = src2Type;
43 this.resultType = resultType;
44 }
45
46 FloatDecoder(int opf, String name, int src2Type, int resultType) {
47 this.opf = opf;
48 this.name = name;
49 numSources = 1;
50 this.src1Type = RTLOP_UNKNOWN;
51 this.src2Type = src2Type;
52 this.resultType = resultType;
53 }
54
55 abstract Instruction decodeFloatInstruction(int instruction,
56 SPARCRegister rs1, SPARCRegister rs2, SPARCRegister rd,
57 SPARCInstructionFactory factory);
58
59 Instruction decode(int instruction, SPARCInstructionFactory factory) {
60 int rs1Num = getSourceRegister1(instruction);
61 int rs2Num = getSourceRegister2(instruction);
62 int rdNum = getDestinationRegister(instruction);
63
64 SPARCRegister rs1 = null;
65 if (numSources == 2) {
66 rs1 = RegisterDecoder.decode(src1Type, rs1Num);
67 if (rs1 == null) {
68 return factory.newIllegalInstruction(instruction);
69 }
70 }
71
72 SPARCRegister rd = RegisterDecoder.decode(resultType, rdNum);
73 SPARCRegister rs2 = RegisterDecoder.decode(src2Type, rs2Num);
74 if (rd == null || rs2 == null) {
75 return factory.newIllegalInstruction(instruction);
76 }
77
78 return decodeFloatInstruction(instruction, rs1, rs2, rd, factory);
79 }
80 }