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comparison src/os_cpu/solaris_x86/vm/bytes_solaris_x86.inline.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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1 /*
2 * Copyright 1998-2007 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 // For Sun Studio - implementation is in solaris_i486.il.
26 // For gcc - implementation is just below.
27 extern "C" u2 _raw_swap_u2(u2 x);
28 extern "C" u4 _raw_swap_u4(u4 x);
29 #ifdef AMD64
30 extern "C" u8 _raw_swap_u8(u8 x);
31 #else
32 extern "C" u8 _raw_swap_u8(u4 x, u4 y);
33 #endif // AMD64
34
35 // Efficient swapping of data bytes from Java byte
36 // ordering to native byte ordering and vice versa.
37 inline u2 Bytes::swap_u2(u2 x) {
38 return _raw_swap_u2(x);
39 }
40
41 inline u4 Bytes::swap_u4(u4 x) {
42 return _raw_swap_u4(x);
43 }
44
45 inline u8 Bytes::swap_u8(u8 x) {
46 #ifdef AMD64
47 return _raw_swap_u8(x);
48 #else
49 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
50 #endif // AMD64
51
52 }
53
54 #ifndef AMD64
55 // Helper function for swap_u8
56 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
57 return _raw_swap_u8(x, y);
58 }
59 #endif // !AMD64
60
61
62 #ifdef _GNU_SOURCE
63
64 extern "C" {
65 #ifdef AMD64
66 inline u2 _raw_swap_u2(u2 x) {
67 register unsigned short int __dest;
68 __asm__ ("rorw $8, %w0": "=r" (__dest): "0" (x): "cc");
69 return __dest;
70 }
71 inline u4 _raw_swap_u4(u4 x) {
72 register unsigned int __dest;
73 __asm__ ("bswap %0" : "=r" (__dest) : "0" (x));
74 return __dest;
75 }
76 inline u8 _raw_swap_u8(u8 x) {
77 register unsigned long __dest;
78 __asm__ ("bswap %q0" : "=r" (__dest) : "0" (x));
79 return __dest;
80 }
81 #else
82 inline u2 _raw_swap_u2(u2 x) {
83 u2 ret;
84 __asm__ __volatile__ (
85 "movw %0, %%ax;"
86 "xchg %%al, %%ah;"
87 "movw %%ax, %0"
88 :"=r" (ret) // output : register 0 => ret
89 :"0" (x) // input : x => register 0
90 :"ax", "0" // clobbered registers
91 );
92 return ret;
93 }
94
95 inline u4 _raw_swap_u4(u4 x) {
96 u4 ret;
97 __asm__ __volatile__ (
98 "bswap %0"
99 :"=r" (ret) // output : register 0 => ret
100 :"0" (x) // input : x => register 0
101 :"0" // clobbered register
102 );
103 return ret;
104 }
105
106 inline u8 _raw_swap_u8(u4 x, u4 y) {
107 return (((u8)_raw_swap_u4(x))<<32) | _raw_swap_u4(y);
108 }
109 #endif // AMD64
110 }
111 #endif //_GNU_SOURCE