bytes_solaris_x86.inline.hpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25#ifndef OS_CPU_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP
26#define OS_CPU_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP
27
28// For Sun Studio - implementation is in solaris_i486.il.
29// For gcc - implementation is just below.
30extern "C" u2 _raw_swap_u2(u2 x);
31extern "C" u4 _raw_swap_u4(u4 x);
32#ifdef AMD64
33extern "C" u8 _raw_swap_u8(u8 x);
34#else
35extern "C" u8 _raw_swap_u8(u4 x, u4 y);
36#endif // AMD64
37
38// Efficient swapping of data bytes from Java byte
39// ordering to native byte ordering and vice versa.
40inline u2   Bytes::swap_u2(u2 x) {
41  return _raw_swap_u2(x);
42}
43
44inline u4   Bytes::swap_u4(u4 x) {
45  return _raw_swap_u4(x);
46}
47
48inline u8   Bytes::swap_u8(u8 x) {
49#ifdef AMD64
50  return _raw_swap_u8(x);
51#else
52  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
53#endif // AMD64
54
55}
56
57#ifndef AMD64
58// Helper function for swap_u8
59inline u8   Bytes::swap_u8_base(u4 x, u4 y) {
60  return _raw_swap_u8(x, y);
61}
62#endif // !AMD64
63
64
65#ifdef _GNU_SOURCE
66
67extern "C" {
68#ifdef AMD64
69  inline u2 _raw_swap_u2(u2 x) {
70    register unsigned short int __dest;
71    __asm__ ("rorw $8, %w0": "=r" (__dest): "0" (x): "cc");
72    return __dest;
73  }
74  inline u4 _raw_swap_u4(u4 x) {
75    register unsigned int __dest;
76    __asm__ ("bswap %0" : "=r" (__dest) : "0" (x));
77    return __dest;
78  }
79  inline u8 _raw_swap_u8(u8 x) {
80    register unsigned long  __dest;
81    __asm__ ("bswap %q0" : "=r" (__dest) : "0" (x));
82    return __dest;
83  }
84#else
85  inline u2 _raw_swap_u2(u2 x) {
86    u2 ret;
87    __asm__ __volatile__ (
88      "movw %0, %%ax;"
89      "xchg %%al, %%ah;"
90      "movw %%ax, %0"
91      :"=r" (ret)      // output : register 0 => ret
92      :"0"  (x)        // input  : x => register 0
93      :"ax", "0"       // clobbered registers
94    );
95    return ret;
96  }
97
98  inline u4 _raw_swap_u4(u4 x) {
99    u4 ret;
100    __asm__ __volatile__ (
101      "bswap %0"
102      :"=r" (ret)      // output : register 0 => ret
103      :"0"  (x)        // input  : x => register 0
104      :"0"             // clobbered register
105    );
106    return ret;
107  }
108
109  inline u8 _raw_swap_u8(u4 x, u4 y) {
110    return (((u8)_raw_swap_u4(x))<<32) | _raw_swap_u4(y);
111  }
112#endif // AMD64
113}
114#endif  //_GNU_SOURCE
115
116#endif // OS_CPU_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP
117