git.r.bdr.sh - rbdr/super-polarity/blob - vendor/frameworks/SDL2.framework/Versions/A/Headers/SDL_endian.h

   1 /*
   2   Simple DirectMedia Layer
   3   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
   4
   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.
   8
   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:
  12
  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.
  20 */
  21
  22 /**
  23  *  \file SDL_endian.h
  24  *
  25  *  Functions for reading and writing endian-specific values
  26  */
  27
  28 #ifndef _SDL_endian_h
  29 #define _SDL_endian_h
  30
  31 #include "SDL_stdinc.h"
  32
  33 /**
  34  *  \name The two types of endianness
  35  */
  36 /*@{*/
  37 #define SDL_LIL_ENDIAN  1234
  38 #define SDL_BIG_ENDIAN  4321
  39 /*@}*/
  40
  41 #ifndef SDL_BYTEORDER           /* Not defined in SDL_config.h? */
  42 #ifdef __linux__
  43 #include <endian.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) || \
  50     defined(__sparc__)
  51 #define SDL_BYTEORDER   SDL_BIG_ENDIAN
  52 #else
  53 #define SDL_BYTEORDER   SDL_LIL_ENDIAN
  54 #endif
  55 #endif /* __linux __ */
  56 #endif /* !SDL_BYTEORDER */
  57
  58
  59 #include "begin_code.h"
  60 /* Set up for C function definitions, even when using C++ */
  61 #ifdef __cplusplus
  62 extern "C" {
  63 #endif
  64
  65 /**
  66  *  \file SDL_endian.h
  67  */
  68 #if defined(__GNUC__) && defined(__i386__) && \
  69    !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
  70 SDL_FORCE_INLINE Uint16
  71 SDL_Swap16(Uint16 x)
  72 {
  73   __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
  74     return x;
  75 }
  76 #elif defined(__GNUC__) && defined(__x86_64__)
  77 SDL_FORCE_INLINE Uint16
  78 SDL_Swap16(Uint16 x)
  79 {
  80   __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
  81     return x;
  82 }
  83 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
  84 SDL_FORCE_INLINE Uint16
  85 SDL_Swap16(Uint16 x)
  86 {
  87     int result;
  88
  89   __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
  90     return (Uint16)result;
  91 }
  92 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
  93 SDL_FORCE_INLINE Uint16
  94 SDL_Swap16(Uint16 x)
  95 {
  96   __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
  97     return x;
  98 }
  99 #else
 100 SDL_FORCE_INLINE Uint16
 101 SDL_Swap16(Uint16 x)
 102 {
 103     return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
 104 }
 105 #endif
 106
 107 #if defined(__GNUC__) && defined(__i386__)
 108 SDL_FORCE_INLINE Uint32
 109 SDL_Swap32(Uint32 x)
 110 {
 111   __asm__("bswap %0": "=r"(x):"0"(x));
 112     return x;
 113 }
 114 #elif defined(__GNUC__) && defined(__x86_64__)
 115 SDL_FORCE_INLINE Uint32
 116 SDL_Swap32(Uint32 x)
 117 {
 118   __asm__("bswapl %0": "=r"(x):"0"(x));
 119     return x;
 120 }
 121 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
 122 SDL_FORCE_INLINE Uint32
 123 SDL_Swap32(Uint32 x)
 124 {
 125     Uint32 result;
 126
 127   __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
 128   __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
 129   __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
 130     return result;
 131 }
 132 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
 133 SDL_FORCE_INLINE Uint32
 134 SDL_Swap32(Uint32 x)
 135 {
 136   __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
 137     return x;
 138 }
 139 #else
 140 SDL_FORCE_INLINE Uint32
 141 SDL_Swap32(Uint32 x)
 142 {
 143     return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
 144                                     ((x >> 8) & 0x0000FF00) | (x >> 24)));
 145 }
 146 #endif
 147
 148 #if defined(__GNUC__) && defined(__i386__)
 149 SDL_FORCE_INLINE Uint64
 150 SDL_Swap64(Uint64 x)
 151 {
 152     union
 153     {
 154         struct
 155         {
 156             Uint32 a, b;
 157         } s;
 158         Uint64 u;
 159     } v;
 160     v.u = x;
 161   __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
 162             "1"(v.s.
 163                 b));
 164     return v.u;
 165 }
 166 #elif defined(__GNUC__) && defined(__x86_64__)
 167 SDL_FORCE_INLINE Uint64
 168 SDL_Swap64(Uint64 x)
 169 {
 170   __asm__("bswapq %0": "=r"(x):"0"(x));
 171     return x;
 172 }
 173 #else
 174 SDL_FORCE_INLINE Uint64
 175 SDL_Swap64(Uint64 x)
 176 {
 177     Uint32 hi, lo;
 178
 179     /* Separate into high and low 32-bit values and swap them */
 180     lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
 181     x >>= 32;
 182     hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
 183     x = SDL_Swap32(lo);
 184     x <<= 32;
 185     x |= SDL_Swap32(hi);
 186     return (x);
 187 }
 188 #endif
 189
 190
 191 SDL_FORCE_INLINE float
 192 SDL_SwapFloat(float x)
 193 {
 194     union
 195     {
 196         float f;
 197         Uint32 ui32;
 198     } swapper;
 199     swapper.f = x;
 200     swapper.ui32 = SDL_Swap32(swapper.ui32);
 201     return swapper.f;
 202 }
 203
 204
 205 /**
 206  *  \name Swap to native
 207  *  Byteswap item from the specified endianness to the native endianness.
 208  */
 209 /*@{*/
 210 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 211 #define SDL_SwapLE16(X) (X)
 212 #define SDL_SwapLE32(X) (X)
 213 #define SDL_SwapLE64(X) (X)
 214 #define SDL_SwapFloatLE(X)  (X)
 215 #define SDL_SwapBE16(X) SDL_Swap16(X)
 216 #define SDL_SwapBE32(X) SDL_Swap32(X)
 217 #define SDL_SwapBE64(X) SDL_Swap64(X)
 218 #define SDL_SwapFloatBE(X)  SDL_SwapFloat(X)
 219 #else
 220 #define SDL_SwapLE16(X) SDL_Swap16(X)
 221 #define SDL_SwapLE32(X) SDL_Swap32(X)
 222 #define SDL_SwapLE64(X) SDL_Swap64(X)
 223 #define SDL_SwapFloatLE(X)  SDL_SwapFloat(X)
 224 #define SDL_SwapBE16(X) (X)
 225 #define SDL_SwapBE32(X) (X)
 226 #define SDL_SwapBE64(X) (X)
 227 #define SDL_SwapFloatBE(X)  (X)
 228 #endif
 229 /*@}*//*Swap to native*/
 230
 231 /* Ends C function definitions when using C++ */
 232 #ifdef __cplusplus
 233 }
 234 #endif
 235 #include "close_code.h"
 236
 237 #endif /* _SDL_endian_h */
 238
 239 /* vi: set ts=4 sw=4 expandtab: */