1/*
2 * Copyright (c) 1999, 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.
22 *
23 */
24
25#ifndef OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP
26#define OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP
27
28#include <byteswap.h>
29
30// Efficient swapping of data bytes from Java byte
31// ordering to native byte ordering and vice versa.
32inline u2   Bytes::swap_u2(u2 x) {
33#ifdef AMD64
34  return bswap_16(x);
35#else
36  u2 ret;
37  __asm__ __volatile__ (
38    "movw %0, %%ax;"
39    "xchg %%al, %%ah;"
40    "movw %%ax, %0"
41    :"=r" (ret)      // output : register 0 => ret
42    :"0"  (x)        // input  : x => register 0
43    :"ax", "0"       // clobbered registers
44  );
45  return ret;
46#endif // AMD64
47}
48
49inline u4   Bytes::swap_u4(u4 x) {
50#ifdef AMD64
51  return bswap_32(x);
52#else
53  u4 ret;
54  __asm__ __volatile__ (
55    "bswap %0"
56    :"=r" (ret)      // output : register 0 => ret
57    :"0"  (x)        // input  : x => register 0
58    :"0"             // clobbered register
59  );
60  return ret;
61#endif // AMD64
62}
63
64#ifdef AMD64
65inline u8 Bytes::swap_u8(u8 x) {
66#ifdef SPARC_WORKS
67  // workaround for SunStudio12 CR6615391
68  __asm__ __volatile__ (
69    "bswapq %0"
70    :"=r" (x)        // output : register 0 => x
71    :"0"  (x)        // input  : x => register 0
72    :"0"             // clobbered register
73  );
74  return x;
75#else
76  return bswap_64(x);
77#endif
78}
79#else
80// Helper function for swap_u8
81inline u8   Bytes::swap_u8_base(u4 x, u4 y) {
82  return (((u8)swap_u4(x))<<32) | swap_u4(y);
83}
84
85inline u8 Bytes::swap_u8(u8 x) {
86  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
87}
88#endif // !AMD64
89
90#endif // OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP
91