1 /* Macros to swap the order of bytes in integer values. s390 version.
2 Copyright (C) 2000-2003, 2008, 2011 Free Software Foundation, Inc.
3 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
22 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
25 #include <bits/wordsize.h>
27 #ifndef _BITS_BYTESWAP_H
28 #define _BITS_BYTESWAP_H 1
30 #define __bswap_constant_16(x) \
31 ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
33 /* Swap bytes in 16 bit value. */
34 #if defined __GNUC__ && __GNUC__ >= 2
36 # define __bswap_16(x) \
38 ({ unsigned short int __v, __x = (x); \
39 if (__builtin_constant_p (x)) \
40 __v = __bswap_constant_16 (__x); \
42 unsigned short int __tmp = (unsigned short int) (__x); \
43 __asm__ __volatile__ ( \
45 : "=&d" (__v) : "m" (__tmp) ); \
49 # define __bswap_16(x) \
51 ({ unsigned short int __v, __x = (x); \
52 if (__builtin_constant_p (x)) \
53 __v = __bswap_constant_16 (__x); \
55 unsigned short int __tmp = (unsigned short int) (__x); \
56 __asm__ __volatile__ ( \
61 : "=&d" (__v) : "m" (__tmp) : "1"); \
66 /* This is better than nothing. */
67 static __inline
unsigned short int
68 __bswap_16 (unsigned short int __bsx
)
70 return __bswap_constant_16 (__bsx
);
74 /* Swap bytes in 32 bit value. */
75 #define __bswap_constant_32(x) \
76 ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
77 (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
79 #if defined __GNUC__ && __GNUC__ >= 2
81 # define __bswap_32(x) \
83 ({ unsigned int __v, __x = (x); \
84 if (__builtin_constant_p (x)) \
85 __v = __bswap_constant_32 (__x); \
87 unsigned int __tmp = (unsigned int) (__x); \
88 __asm__ __volatile__ ( \
90 : "=&d" (__v) : "m" (__tmp)); \
94 # define __bswap_32(x) \
96 ({ unsigned int __v, __x = (x); \
97 if (__builtin_constant_p (x)) \
98 __v = __bswap_constant_32 (__x); \
100 unsigned int __tmp = (unsigned int) (__x); \
101 __asm__ __volatile__ ( \
107 : "=&d" (__v) : "m" (__tmp) : "1"); \
112 static __inline
unsigned int
113 __bswap_32 (unsigned int __bsx
)
115 return __bswap_constant_32 (__bsx
);
119 /* Swap bytes in 64 bit value. */
120 #if defined __GNUC__ && __GNUC__ >= 2
121 # define __bswap_constant_64(x) \
122 (__extension__ ((((x) & 0xff00000000000000ul) >> 56) \
123 | (((x) & 0x00ff000000000000ul) >> 40) \
124 | (((x) & 0x0000ff0000000000ul) >> 24) \
125 | (((x) & 0x000000ff00000000ul) >> 8) \
126 | (((x) & 0x00000000ff000000ul) << 8) \
127 | (((x) & 0x0000000000ff0000ul) << 24) \
128 | (((x) & 0x000000000000ff00ul) << 40) \
129 | (((x) & 0x00000000000000fful) << 56)))
131 # if __WORDSIZE == 64
132 # define __bswap_64(x) \
134 ({ unsigned long __w, __x = (x); \
135 if (__builtin_constant_p (x)) \
136 __w = __bswap_constant_64 (__x); \
138 unsigned long __tmp = (unsigned long) (__x); \
139 __asm__ __volatile__ ( \
141 : "=&d" (__w) : "m" (__tmp)); \
145 # define __bswap_64(x) \
147 ({ union { unsigned long long int __ll; \
148 unsigned long int __l[2]; } __w, __r; \
150 __r.__l[0] = __bswap_32 (__w.__l[1]); \
151 __r.__l[1] = __bswap_32 (__w.__l[0]); \
155 # define __bswap_constant_64(x) \
156 ((((x) & 0xff00000000000000ul) >> 56) \
157 | (((x) & 0x00ff000000000000ul) >> 40) \
158 | (((x) & 0x0000ff0000000000ul) >> 24) \
159 | (((x) & 0x000000ff00000000ul) >> 8) \
160 | (((x) & 0x00000000ff000000ul) << 8) \
161 | (((x) & 0x0000000000ff0000ul) << 24) \
162 | (((x) & 0x000000000000ff00ul) << 40) \
163 | (((x) & 0x00000000000000fful) << 56))
165 static __inline
unsigned long long int
166 __bswap_64 (unsigned long long int __bsx
)
168 return __bswap_constant_64 (__bsx
);
172 #endif /* _BITS_BYTESWAP_H */