bytes_solaris_x86.inline.hpp revision 0:a61af66fc99e 
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.
27extern "C" u2 _raw_swap_u2(u2 x);
28extern "C" u4 _raw_swap_u4(u4 x);
29#ifdef AMD64
30extern "C" u8 _raw_swap_u8(u8 x);
31#else
32extern "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.
37inline u2   Bytes::swap_u2(u2 x) {
38  return _raw_swap_u2(x);
39}
40
41inline u4   Bytes::swap_u4(u4 x) {
42  return _raw_swap_u4(x);
43}
44
45inline 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
56inline 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
64extern "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
112