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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/RegisterDecoder.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.RTLDataTypes;
28
29 class RegisterDecoder implements /* imports */ RTLDataTypes {
30 // refer to page 40 - section 5.1.4.1 - Floating-point Register Number Encoding
31 private static SPARCFloatRegister decodeDouble(int num) {
32 // 6 bit double precision registers are encoded in 5 bits as
33 // b<4> b<3> b<2> b<1> b<5>.
34
35 boolean lsb = (0x1 & num) != 0;
36 if (lsb)
37 num |= 0x20; // 10000b
38
39 if ((num % 2) != 0)
40 return null;
41
42 return SPARCFloatRegisters.getRegister(num);
43 }
44
45 private static SPARCFloatRegister decodeQuad(int num) {
46 // 6 bit quad precision registers are encoded in 5 bits as
47 // b<4> b<3> b<2> 0 b<5>
48
49 boolean lsb = (0x1 & num) != 0;
50 if (lsb)
51 num |= 0x20; // 10000b
52
53 if ((num % 4) != 0)
54 return null;
55
56 return SPARCFloatRegisters.getRegister(num);
57 }
58
59 static SPARCRegister decode(int dataType, int regNum) {
60 regNum &= 0x1F; // mask out all but lsb 5 bits
61 SPARCRegister result = null;
62 switch (dataType) {
63 case RTLDT_FL_SINGLE:
64 result = SPARCFloatRegisters.getRegister(regNum);
65 break;
66
67 case RTLDT_FL_DOUBLE:
68 result = decodeDouble(regNum);
69 break;
70
71 case RTLDT_FL_QUAD:
72 result = decodeQuad(regNum);
73 break;
74
75 case RTLDT_UNKNOWN:
76 result = null;
77 break;
78
79 default: // some integer register
80 result = SPARCRegisters.getRegister(regNum);
81 break;
82 }
83 return result;
84 }
85 }