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Diffstat (limited to 'dependencies/SDL/SDL_endian.h')
| -rw-r--r-- | dependencies/SDL/SDL_endian.h | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/dependencies/SDL/SDL_endian.h b/dependencies/SDL/SDL_endian.h new file mode 100644 index 0000000..c3f8431 --- /dev/null +++ b/dependencies/SDL/SDL_endian.h @@ -0,0 +1,348 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/** + * \file SDL_endian.h + * + * Functions for reading and writing endian-specific values + */ + +#ifndef SDL_endian_h_ +#define SDL_endian_h_ + +#include "SDL_stdinc.h" + +#if defined(_MSC_VER) && (_MSC_VER >= 1400) +/* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version, + so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */ +#ifdef __clang__ +#ifndef __PRFCHWINTRIN_H +#define __PRFCHWINTRIN_H +static __inline__ void __attribute__((__always_inline__, __nodebug__)) +_m_prefetch(void *__P) +{ + __builtin_prefetch(__P, 0, 3 /* _MM_HINT_T0 */); +} +#endif /* __PRFCHWINTRIN_H */ +#endif /* __clang__ */ + +#include <intrin.h> +#endif + +/** + * \name The two types of endianness + */ +/* @{ */ +#define SDL_LIL_ENDIAN 1234 +#define SDL_BIG_ENDIAN 4321 +/* @} */ + +#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ +#ifdef __linux__ +#include <endian.h> +#define SDL_BYTEORDER __BYTE_ORDER +#elif defined(__OpenBSD__) || defined(__DragonFly__) +#include <endian.h> +#define SDL_BYTEORDER BYTE_ORDER +#elif defined(__FreeBSD__) || defined(__NetBSD__) +#include <sys/endian.h> +#define SDL_BYTEORDER BYTE_ORDER +/* predefs from newer gcc and clang versions: */ +#elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__) +#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#define SDL_BYTEORDER SDL_LIL_ENDIAN +#elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) +#define SDL_BYTEORDER SDL_BIG_ENDIAN +#else +#error Unsupported endianness +#endif /**/ +#else +#if defined(__hppa__) || \ + defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ + (defined(__MIPS__) && defined(__MIPSEB__)) || \ + defined(__ppc__) || defined(__POWERPC__) || defined(__powerpc__) || defined(__PPC__) || \ + defined(__sparc__) +#define SDL_BYTEORDER SDL_BIG_ENDIAN +#else +#define SDL_BYTEORDER SDL_LIL_ENDIAN +#endif +#endif /* __linux__ */ +#endif /* !SDL_BYTEORDER */ + +#ifndef SDL_FLOATWORDORDER /* Not defined in SDL_config.h? */ +/* predefs from newer gcc versions: */ +#if defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__FLOAT_WORD_ORDER__) +#if (__FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN +#elif (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__) +#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN +#else +#error Unsupported endianness +#endif /**/ +#elif defined(__MAVERICK__) +/* For Maverick, float words are always little-endian. */ +#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN +#elif (defined(__arm__) || defined(__thumb__)) && !defined(__VFP_FP__) && !defined(__ARM_EABI__) +/* For FPA, float words are always big-endian. */ +#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN +#else +/* By default, assume that floats words follow the memory system mode. */ +#define SDL_FLOATWORDORDER SDL_BYTEORDER +#endif /* __FLOAT_WORD_ORDER__ */ +#endif /* !SDL_FLOATWORDORDER */ + + +#include "begin_code.h" +/* Set up for C function definitions, even when using C++ */ +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \file SDL_endian.h + */ + +/* various modern compilers may have builtin swap */ +#if defined(__GNUC__) || defined(__clang__) +# define HAS_BUILTIN_BSWAP16 (_SDL_HAS_BUILTIN(__builtin_bswap16)) || \ + (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) +# define HAS_BUILTIN_BSWAP32 (_SDL_HAS_BUILTIN(__builtin_bswap32)) || \ + (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) +# define HAS_BUILTIN_BSWAP64 (_SDL_HAS_BUILTIN(__builtin_bswap64)) || \ + (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) + + /* this one is broken */ +# define HAS_BROKEN_BSWAP (__GNUC__ == 2 && __GNUC_MINOR__ <= 95) +#else +# define HAS_BUILTIN_BSWAP16 0 +# define HAS_BUILTIN_BSWAP32 0 +# define HAS_BUILTIN_BSWAP64 0 +# define HAS_BROKEN_BSWAP 0 +#endif + +#if HAS_BUILTIN_BSWAP16 +#define SDL_Swap16(x) __builtin_bswap16(x) +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) +#pragma intrinsic(_byteswap_ushort) +#define SDL_Swap16(x) _byteswap_ushort(x) +#elif defined(__i386__) && !HAS_BROKEN_BSWAP +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); + return x; +} +#elif defined(__x86_64__) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); + return x; +} +#elif (defined(__powerpc__) || defined(__ppc__)) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + int result; + + __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); + return (Uint16)result; +} +#elif (defined(__m68k__) && !defined(__mcoldfire__)) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); + return x; +} +#elif defined(__WATCOMC__) && defined(__386__) +extern __inline Uint16 SDL_Swap16(Uint16); +#pragma aux SDL_Swap16 = \ + "xchg al, ah" \ + parm [ax] \ + modify [ax]; +#else +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); +} +#endif + +#if HAS_BUILTIN_BSWAP32 +#define SDL_Swap32(x) __builtin_bswap32(x) +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) +#pragma intrinsic(_byteswap_ulong) +#define SDL_Swap32(x) _byteswap_ulong(x) +#elif defined(__i386__) && !HAS_BROKEN_BSWAP +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("bswap %0": "=r"(x):"0"(x)); + return x; +} +#elif defined(__x86_64__) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("bswapl %0": "=r"(x):"0"(x)); + return x; +} +#elif (defined(__powerpc__) || defined(__ppc__)) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + Uint32 result; + + __asm__("rlwimi %0,%2,24,16,23": "=&r"(result): "0" (x>>24), "r"(x)); + __asm__("rlwimi %0,%2,8,8,15" : "=&r"(result): "0" (result), "r"(x)); + __asm__("rlwimi %0,%2,24,0,7" : "=&r"(result): "0" (result), "r"(x)); + return result; +} +#elif (defined(__m68k__) && !defined(__mcoldfire__)) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); + return x; +} +#elif defined(__WATCOMC__) && defined(__386__) +extern __inline Uint32 SDL_Swap32(Uint32); +#pragma aux SDL_Swap32 = \ + "bswap eax" \ + parm [eax] \ + modify [eax]; +#else +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | + ((x >> 8) & 0x0000FF00) | (x >> 24))); +} +#endif + +#if HAS_BUILTIN_BSWAP64 +#define SDL_Swap64(x) __builtin_bswap64(x) +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) +#pragma intrinsic(_byteswap_uint64) +#define SDL_Swap64(x) _byteswap_uint64(x) +#elif defined(__i386__) && !HAS_BROKEN_BSWAP +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + union { + struct { + Uint32 a, b; + } s; + Uint64 u; + } v; + v.u = x; + __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" + : "=r"(v.s.a), "=r"(v.s.b) + : "0" (v.s.a), "1"(v.s.b)); + return v.u; +} +#elif defined(__x86_64__) +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + __asm__("bswapq %0": "=r"(x):"0"(x)); + return x; +} +#elif defined(__WATCOMC__) && defined(__386__) +extern __inline Uint64 SDL_Swap64(Uint64); +#pragma aux SDL_Swap64 = \ + "bswap eax" \ + "bswap edx" \ + "xchg eax,edx" \ + parm [eax edx] \ + modify [eax edx]; +#else +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + Uint32 hi, lo; + + /* Separate into high and low 32-bit values and swap them */ + lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); + x >>= 32; + hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); + x = SDL_Swap32(lo); + x <<= 32; + x |= SDL_Swap32(hi); + return (x); +} +#endif + + +SDL_FORCE_INLINE float +SDL_SwapFloat(float x) +{ + union { + float f; + Uint32 ui32; + } swapper; + swapper.f = x; + swapper.ui32 = SDL_Swap32(swapper.ui32); + return swapper.f; +} + +/* remove extra macros */ +#undef HAS_BROKEN_BSWAP +#undef HAS_BUILTIN_BSWAP16 +#undef HAS_BUILTIN_BSWAP32 +#undef HAS_BUILTIN_BSWAP64 + +/** + * \name Swap to native + * Byteswap item from the specified endianness to the native endianness. + */ +/* @{ */ +#if SDL_BYTEORDER == SDL_LIL_ENDIAN +#define SDL_SwapLE16(X) (X) +#define SDL_SwapLE32(X) (X) +#define SDL_SwapLE64(X) (X) +#define SDL_SwapFloatLE(X) (X) +#define SDL_SwapBE16(X) SDL_Swap16(X) +#define SDL_SwapBE32(X) SDL_Swap32(X) +#define SDL_SwapBE64(X) SDL_Swap64(X) +#define SDL_SwapFloatBE(X) SDL_SwapFloat(X) +#else +#define SDL_SwapLE16(X) SDL_Swap16(X) +#define SDL_SwapLE32(X) SDL_Swap32(X) +#define SDL_SwapLE64(X) SDL_Swap64(X) +#define SDL_SwapFloatLE(X) SDL_SwapFloat(X) +#define SDL_SwapBE16(X) (X) +#define SDL_SwapBE32(X) (X) +#define SDL_SwapBE64(X) (X) +#define SDL_SwapFloatBE(X) (X) +#endif +/* @} *//* Swap to native */ + +/* Ends C function definitions when using C++ */ +#ifdef __cplusplus +} +#endif +#include "close_code.h" + +#endif /* SDL_endian_h_ */ + +/* vi: set ts=4 sw=4 expandtab: */ |