| /* |
| 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: */ |