Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/asm/sparc/RegisterDecoder.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
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| rev | line source |
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| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 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 } |