2
Simple DirectMedia Layer
3
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
5
This software is provided 'as-is', without any express or implied
6
warranty. In no event will the authors be held liable for any damages
7
arising from the use of this software.
9
Permission is granted to anyone to use this software for any purpose,
10
including commercial applications, and to alter it and redistribute it
11
freely, subject to the following restrictions:
13
1. The origin of this software must not be misrepresented; you must not
14
claim that you wrote the original software. If you use this software
15
in a product, an acknowledgment in the product documentation would be
16
appreciated but is not required.
17
2. Altered source versions must be plainly marked as such, and must not be
18
misrepresented as being the original software.
19
3. This notice may not be removed or altered from any source distribution.
25
* Functions for reading and writing endian-specific values
31
#include "SDL_stdinc.h"
34
* \name The two types of endianness
37
#define SDL_LIL_ENDIAN 1234
38
#define SDL_BIG_ENDIAN 4321
41
#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
44
#define SDL_BYTEORDER __BYTE_ORDER
45
#else /* __linux __ */
46
#if defined(__hppa__) || \
47
defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
48
(defined(__MIPS__) && defined(__MISPEB__)) || \
49
defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
51
#define SDL_BYTEORDER SDL_BIG_ENDIAN
53
#define SDL_BYTEORDER SDL_LIL_ENDIAN
55
#endif /* __linux __ */
56
#endif /* !SDL_BYTEORDER */
59
#include "begin_code.h"
60
/* Set up for C function definitions, even when using C++ */
70
* Uses inline functions for compilers that support them, and static
71
* functions for those that do not. Because these functions become
72
* static for compilers that do not support inline functions, this
73
* header should only be included in files that actually use them.
75
#if defined(__GNUC__) && defined(__i386__) && \
76
!(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
77
static __inline__ Uint16
80
__asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
83
#elif defined(__GNUC__) && defined(__x86_64__)
84
static __inline__ Uint16
87
__asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
90
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
91
static __inline__ Uint16
96
__asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
99
#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
100
static __inline__ Uint16
103
__asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
107
static __inline__ Uint16
110
return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
114
#if defined(__GNUC__) && defined(__i386__)
115
static __inline__ Uint32
118
__asm__("bswap %0": "=r"(x):"0"(x));
121
#elif defined(__GNUC__) && defined(__x86_64__)
122
static __inline__ Uint32
125
__asm__("bswapl %0": "=r"(x):"0"(x));
128
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
129
static __inline__ Uint32
134
__asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
135
__asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
136
__asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
139
#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
140
static __inline__ Uint32
143
__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
147
static __inline__ Uint32
150
return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
151
((x >> 8) & 0x0000FF00) | (x >> 24)));
155
#if defined(__GNUC__) && defined(__i386__)
156
static __inline__ Uint64
168
__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
173
#elif defined(__GNUC__) && defined(__x86_64__)
174
static __inline__ Uint64
177
__asm__("bswapq %0": "=r"(x):"0"(x));
181
static __inline__ Uint64
186
/* Separate into high and low 32-bit values and swap them */
187
lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
189
hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
198
static __inline__ float
199
SDL_SwapFloat(float x)
207
swapper.ui32 = SDL_Swap32(swapper.ui32);
213
* \name Swap to native
214
* Byteswap item from the specified endianness to the native endianness.
217
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
218
#define SDL_SwapLE16(X) (X)
219
#define SDL_SwapLE32(X) (X)
220
#define SDL_SwapLE64(X) (X)
221
#define SDL_SwapFloatLE(X) (X)
222
#define SDL_SwapBE16(X) SDL_Swap16(X)
223
#define SDL_SwapBE32(X) SDL_Swap32(X)
224
#define SDL_SwapBE64(X) SDL_Swap64(X)
225
#define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
227
#define SDL_SwapLE16(X) SDL_Swap16(X)
228
#define SDL_SwapLE32(X) SDL_Swap32(X)
229
#define SDL_SwapLE64(X) SDL_Swap64(X)
230
#define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
231
#define SDL_SwapBE16(X) (X)
232
#define SDL_SwapBE32(X) (X)
233
#define SDL_SwapBE64(X) (X)
234
#define SDL_SwapFloatBE(X) (X)
236
/*@}*//*Swap to native*/
238
/* Ends C function definitions when using C++ */
244
#include "close_code.h"
246
#endif /* _SDL_endian_h */
248
/* vi: set ts=4 sw=4 expandtab: */