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.
22 *
23 */
24
25#ifndef OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
26#define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
27
28#pragma warning(disable: 4035) // Disable warning 4035: no return value
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  address p = (address) &x;
35  return  ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
36#else
37  __asm {
38    mov ax, x
39    xchg al, ah
40  }
41  // no return statement needed, result is already in ax
42  // compiler warning C4035 disabled via warning pragma
43#endif // AMD64
44}
45
46inline u4 Bytes::swap_u4(u4 x) {
47#ifdef AMD64
48  address p = (address) &x;
49  return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;
50#else
51  __asm {
52    mov eax, x
53    bswap eax
54  }
55  // no return statement needed, result is already in eax
56  // compiler warning C4035 disabled via warning pragma
57#endif // AMD64
58}
59
60#ifdef AMD64
61inline u8 Bytes::swap_u8(u8 x) {
62  address p = (address) &x;
63  return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |
64           (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8)  | u8(p[7])) ;
65}
66
67#else
68// Helper function for swap_u8
69inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
70  __asm {
71    mov eax, y
72    mov edx, x
73    bswap eax
74    bswap edx
75  }
76  // no return statement needed, result is already in edx:eax
77  // compiler warning C4035 disabled via warning pragma
78}
79
80inline u8 Bytes::swap_u8(u8 x) {
81  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
82}
83#endif // AMD64
84
85#pragma warning(default: 4035) // Enable warning 4035: no return value
86
87#endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
88