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  1. /*
  2.   Simple DirectMedia Layer
  3.   Copyright (C) 1997-2023 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. #if defined(_MSC_VER) && (_MSC_VER >= 1400)
  34. /* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version,
  35.    so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */
  36. #ifdef __clang__
  37. #ifndef __PRFCHWINTRIN_H
  38. #define __PRFCHWINTRIN_H
  39. static __inline__ void __attribute__((__always_inline__, __nodebug__))
  40. _m_prefetch(void *__P)
  41. {
  42.   __builtin_prefetch(__P, 0, 3 /* _MM_HINT_T0 */);
  43. }
  44. #endif /* __PRFCHWINTRIN_H */
  45. #endif /* __clang__ */
  46.  
  47. #include <intrin.h>
  48. #endif
  49.  
  50. /**
  51.  *  \name The two types of endianness
  52.  */
  53. /* @{ */
  54. #define SDL_LIL_ENDIAN  1234
  55. #define SDL_BIG_ENDIAN  4321
  56. /* @} */
  57.  
  58. #ifndef SDL_BYTEORDER           /* Not defined in SDL_config.h? */
  59. #ifdef __linux__
  60. #include <endian.h>
  61. #define SDL_BYTEORDER  __BYTE_ORDER
  62. #elif defined(__OpenBSD__) || defined(__DragonFly__)
  63. #include <endian.h>
  64. #define SDL_BYTEORDER  BYTE_ORDER
  65. #elif defined(__FreeBSD__) || defined(__NetBSD__)
  66. #include <sys/endian.h>
  67. #define SDL_BYTEORDER  BYTE_ORDER
  68. /* predefs from newer gcc and clang versions: */
  69. #elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__)
  70. #if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
  71. #define SDL_BYTEORDER   SDL_LIL_ENDIAN
  72. #elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
  73. #define SDL_BYTEORDER   SDL_BIG_ENDIAN
  74. #else
  75. #error Unsupported endianness
  76. #endif /**/
  77. #else
  78. #if defined(__hppa__) || \
  79.     defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
  80.     (defined(__MIPS__) && defined(__MIPSEB__)) || \
  81.     defined(__ppc__) || defined(__POWERPC__) || defined(__powerpc__) || defined(__PPC__) || \
  82.     defined(__sparc__)
  83. #define SDL_BYTEORDER   SDL_BIG_ENDIAN
  84. #else
  85. #define SDL_BYTEORDER   SDL_LIL_ENDIAN
  86. #endif
  87. #endif /* __linux__ */
  88. #endif /* !SDL_BYTEORDER */
  89.  
  90. #ifndef SDL_FLOATWORDORDER           /* Not defined in SDL_config.h? */
  91. /* predefs from newer gcc versions: */
  92. #if defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__FLOAT_WORD_ORDER__)
  93. #if (__FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__)
  94. #define SDL_FLOATWORDORDER   SDL_LIL_ENDIAN
  95. #elif (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__)
  96. #define SDL_FLOATWORDORDER   SDL_BIG_ENDIAN
  97. #else
  98. #error Unsupported endianness
  99. #endif /**/
  100. #elif defined(__MAVERICK__)
  101. /* For Maverick, float words are always little-endian. */
  102. #define SDL_FLOATWORDORDER   SDL_LIL_ENDIAN
  103. #elif (defined(__arm__) || defined(__thumb__)) && !defined(__VFP_FP__) && !defined(__ARM_EABI__)
  104. /* For FPA, float words are always big-endian. */
  105. #define SDL_FLOATWORDORDER   SDL_BIG_ENDIAN
  106. #else
  107. /* By default, assume that floats words follow the memory system mode. */
  108. #define SDL_FLOATWORDORDER   SDL_BYTEORDER
  109. #endif /* __FLOAT_WORD_ORDER__ */
  110. #endif /* !SDL_FLOATWORDORDER */
  111.  
  112.  
  113. #include "begin_code.h"
  114. /* Set up for C function definitions, even when using C++ */
  115. #ifdef __cplusplus
  116. extern "C" {
  117. #endif
  118.  
  119. /**
  120.  *  \file SDL_endian.h
  121.  */
  122.  
  123. /* various modern compilers may have builtin swap */
  124. #if defined(__GNUC__) || defined(__clang__)
  125. #   define HAS_BUILTIN_BSWAP16 (_SDL_HAS_BUILTIN(__builtin_bswap16)) || \
  126.         (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
  127. #   define HAS_BUILTIN_BSWAP32 (_SDL_HAS_BUILTIN(__builtin_bswap32)) || \
  128.         (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
  129. #   define HAS_BUILTIN_BSWAP64 (_SDL_HAS_BUILTIN(__builtin_bswap64)) || \
  130.         (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
  131.  
  132.     /* this one is broken */
  133. #   define HAS_BROKEN_BSWAP (__GNUC__ == 2 && __GNUC_MINOR__ <= 95)
  134. #else
  135. #   define HAS_BUILTIN_BSWAP16 0
  136. #   define HAS_BUILTIN_BSWAP32 0
  137. #   define HAS_BUILTIN_BSWAP64 0
  138. #   define HAS_BROKEN_BSWAP 0
  139. #endif
  140.  
  141. #if HAS_BUILTIN_BSWAP16
  142. #define SDL_Swap16(x) __builtin_bswap16(x)
  143. #elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
  144. #pragma intrinsic(_byteswap_ushort)
  145. #define SDL_Swap16(x) _byteswap_ushort(x)
  146. #elif defined(__i386__) && !HAS_BROKEN_BSWAP
  147. SDL_FORCE_INLINE Uint16
  148. SDL_Swap16(Uint16 x)
  149. {
  150.   __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
  151.     return x;
  152. }
  153. #elif defined(__x86_64__)
  154. SDL_FORCE_INLINE Uint16
  155. SDL_Swap16(Uint16 x)
  156. {
  157.   __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
  158.     return x;
  159. }
  160. #elif (defined(__powerpc__) || defined(__ppc__))
  161. SDL_FORCE_INLINE Uint16
  162. SDL_Swap16(Uint16 x)
  163. {
  164.     int result;
  165.  
  166.   __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
  167.     return (Uint16)result;
  168. }
  169. #elif (defined(__m68k__) && !defined(__mcoldfire__))
  170. SDL_FORCE_INLINE Uint16
  171. SDL_Swap16(Uint16 x)
  172. {
  173.   __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
  174.     return x;
  175. }
  176. #elif defined(__WATCOMC__) && defined(__386__)
  177. extern __inline Uint16 SDL_Swap16(Uint16);
  178. #pragma aux SDL_Swap16 = \
  179.   "xchg al, ah" \
  180.   parm   [ax]   \
  181.   modify [ax];
  182. #else
  183. SDL_FORCE_INLINE Uint16
  184. SDL_Swap16(Uint16 x)
  185. {
  186.     return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
  187. }
  188. #endif
  189.  
  190. #if HAS_BUILTIN_BSWAP32
  191. #define SDL_Swap32(x) __builtin_bswap32(x)
  192. #elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
  193. #pragma intrinsic(_byteswap_ulong)
  194. #define SDL_Swap32(x) _byteswap_ulong(x)
  195. #elif defined(__i386__) && !HAS_BROKEN_BSWAP
  196. SDL_FORCE_INLINE Uint32
  197. SDL_Swap32(Uint32 x)
  198. {
  199.   __asm__("bswap %0": "=r"(x):"0"(x));
  200.     return x;
  201. }
  202. #elif defined(__x86_64__)
  203. SDL_FORCE_INLINE Uint32
  204. SDL_Swap32(Uint32 x)
  205. {
  206.   __asm__("bswapl %0": "=r"(x):"0"(x));
  207.     return x;
  208. }
  209. #elif (defined(__powerpc__) || defined(__ppc__))
  210. SDL_FORCE_INLINE Uint32
  211. SDL_Swap32(Uint32 x)
  212. {
  213.     Uint32 result;
  214.  
  215.   __asm__("rlwimi %0,%2,24,16,23": "=&r"(result): "0" (x>>24),  "r"(x));
  216.   __asm__("rlwimi %0,%2,8,8,15"  : "=&r"(result): "0" (result), "r"(x));
  217.   __asm__("rlwimi %0,%2,24,0,7"  : "=&r"(result): "0" (result), "r"(x));
  218.     return result;
  219. }
  220. #elif (defined(__m68k__) && !defined(__mcoldfire__))
  221. SDL_FORCE_INLINE Uint32
  222. SDL_Swap32(Uint32 x)
  223. {
  224.   __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
  225.     return x;
  226. }
  227. #elif defined(__WATCOMC__) && defined(__386__)
  228. extern __inline Uint32 SDL_Swap32(Uint32);
  229. #pragma aux SDL_Swap32 = \
  230.   "bswap eax"  \
  231.   parm   [eax] \
  232.   modify [eax];
  233. #else
  234. SDL_FORCE_INLINE Uint32
  235. SDL_Swap32(Uint32 x)
  236. {
  237.     return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
  238.                                     ((x >> 8) & 0x0000FF00) | (x >> 24)));
  239. }
  240. #endif
  241.  
  242. #if HAS_BUILTIN_BSWAP64
  243. #define SDL_Swap64(x) __builtin_bswap64(x)
  244. #elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
  245. #pragma intrinsic(_byteswap_uint64)
  246. #define SDL_Swap64(x) _byteswap_uint64(x)
  247. #elif defined(__i386__) && !HAS_BROKEN_BSWAP
  248. SDL_FORCE_INLINE Uint64
  249. SDL_Swap64(Uint64 x)
  250. {
  251.     union {
  252.         struct {
  253.             Uint32 a, b;
  254.         } s;
  255.         Uint64 u;
  256.     } v;
  257.     v.u = x;
  258.   __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
  259.           : "=r"(v.s.a), "=r"(v.s.b)
  260.           : "0" (v.s.a),  "1"(v.s.b));
  261.     return v.u;
  262. }
  263. #elif defined(__x86_64__)
  264. SDL_FORCE_INLINE Uint64
  265. SDL_Swap64(Uint64 x)
  266. {
  267.   __asm__("bswapq %0": "=r"(x):"0"(x));
  268.     return x;
  269. }
  270. #elif defined(__WATCOMC__) && defined(__386__)
  271. extern __inline Uint64 SDL_Swap64(Uint64);
  272. #pragma aux SDL_Swap64 = \
  273.   "bswap eax"     \
  274.   "bswap edx"     \
  275.   "xchg eax,edx"  \
  276.   parm [eax edx]  \
  277.   modify [eax edx];
  278. #else
  279. SDL_FORCE_INLINE Uint64
  280. SDL_Swap64(Uint64 x)
  281. {
  282.     Uint32 hi, lo;
  283.  
  284.     /* Separate into high and low 32-bit values and swap them */
  285.     lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
  286.     x >>= 32;
  287.     hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
  288.     x = SDL_Swap32(lo);
  289.     x <<= 32;
  290.     x |= SDL_Swap32(hi);
  291.     return (x);
  292. }
  293. #endif
  294.  
  295.  
  296. SDL_FORCE_INLINE float
  297. SDL_SwapFloat(float x)
  298. {
  299.     union {
  300.         float f;
  301.         Uint32 ui32;
  302.     } swapper;
  303.     swapper.f = x;
  304.     swapper.ui32 = SDL_Swap32(swapper.ui32);
  305.     return swapper.f;
  306. }
  307.  
  308. /* remove extra macros */
  309. #undef HAS_BROKEN_BSWAP
  310. #undef HAS_BUILTIN_BSWAP16
  311. #undef HAS_BUILTIN_BSWAP32
  312. #undef HAS_BUILTIN_BSWAP64
  313.  
  314. /**
  315.  *  \name Swap to native
  316.  *  Byteswap item from the specified endianness to the native endianness.
  317.  */
  318. /* @{ */
  319. #if SDL_BYTEORDER == SDL_LIL_ENDIAN
  320. #define SDL_SwapLE16(X)     (X)
  321. #define SDL_SwapLE32(X)     (X)
  322. #define SDL_SwapLE64(X)     (X)
  323. #define SDL_SwapFloatLE(X)  (X)
  324. #define SDL_SwapBE16(X)     SDL_Swap16(X)
  325. #define SDL_SwapBE32(X)     SDL_Swap32(X)
  326. #define SDL_SwapBE64(X)     SDL_Swap64(X)
  327. #define SDL_SwapFloatBE(X)  SDL_SwapFloat(X)
  328. #else
  329. #define SDL_SwapLE16(X)     SDL_Swap16(X)
  330. #define SDL_SwapLE32(X)     SDL_Swap32(X)
  331. #define SDL_SwapLE64(X)     SDL_Swap64(X)
  332. #define SDL_SwapFloatLE(X)  SDL_SwapFloat(X)
  333. #define SDL_SwapBE16(X)     (X)
  334. #define SDL_SwapBE32(X)     (X)
  335. #define SDL_SwapBE64(X)     (X)
  336. #define SDL_SwapFloatBE(X)  (X)
  337. #endif
  338. /* @} *//* Swap to native */
  339.  
  340. /* Ends C function definitions when using C++ */
  341. #ifdef __cplusplus
  342. }
  343. #endif
  344. #include "close_code.h"
  345.  
  346. #endif /* SDL_endian_h_ */
  347.  
  348. /* vi: set ts=4 sw=4 expandtab: */
  349.