Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/RegisterDecoder.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 } |