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263 lines
6.4 KiB
263 lines
6.4 KiB
/* |
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Simple DirectMedia Layer |
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
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This software is provided 'as-is', without any express or implied |
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warranty. In no event will the authors be held liable for any damages |
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arising from the use of this software. |
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Permission is granted to anyone to use this software for any purpose, |
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including commercial applications, and to alter it and redistribute it |
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freely, subject to the following restrictions: |
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1. The origin of this software must not be misrepresented; you must not |
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claim that you wrote the original software. If you use this software |
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in a product, an acknowledgment in the product documentation would be |
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appreciated but is not required. |
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2. Altered source versions must be plainly marked as such, and must not be |
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misrepresented as being the original software. |
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3. This notice may not be removed or altered from any source distribution. |
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*/ |
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/** |
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* \file SDL_endian.h |
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* |
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* Functions for reading and writing endian-specific values |
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*/ |
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#ifndef SDL_endian_h_ |
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#define SDL_endian_h_ |
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#include "SDL_stdinc.h" |
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/** |
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* \name The two types of endianness |
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*/ |
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/* @{ */ |
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#define SDL_LIL_ENDIAN 1234 |
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#define SDL_BIG_ENDIAN 4321 |
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/* @} */ |
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#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ |
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#ifdef __linux__ |
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#include <endian.h> |
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#define SDL_BYTEORDER __BYTE_ORDER |
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#elif defined(__OpenBSD__) |
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#include <endian.h> |
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#define SDL_BYTEORDER BYTE_ORDER |
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#else |
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#if defined(__hppa__) || \ |
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defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ |
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(defined(__MIPS__) && defined(__MIPSEB__)) || \ |
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defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ |
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defined(__sparc__) |
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#define SDL_BYTEORDER SDL_BIG_ENDIAN |
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#else |
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#define SDL_BYTEORDER SDL_LIL_ENDIAN |
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#endif |
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#endif /* __linux__ */ |
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#endif /* !SDL_BYTEORDER */ |
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#include "begin_code.h" |
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/* Set up for C function definitions, even when using C++ */ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** |
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* \file SDL_endian.h |
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*/ |
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#if defined(__GNUC__) && defined(__i386__) && \ |
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!(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */) |
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SDL_FORCE_INLINE Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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SDL_FORCE_INLINE Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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SDL_FORCE_INLINE Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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int result; |
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__asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); |
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return (Uint16)result; |
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} |
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) |
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SDL_FORCE_INLINE Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); |
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return x; |
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} |
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#elif defined(__WATCOMC__) && defined(__386__) |
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extern _inline Uint16 SDL_Swap16(Uint16); |
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#pragma aux SDL_Swap16 = \ |
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"xchg al, ah" \ |
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parm [ax] \ |
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modify [ax]; |
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#else |
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SDL_FORCE_INLINE Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); |
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} |
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#endif |
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#if defined(__GNUC__) && defined(__i386__) |
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SDL_FORCE_INLINE Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswap %0": "=r"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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SDL_FORCE_INLINE Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswapl %0": "=r"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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SDL_FORCE_INLINE Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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Uint32 result; |
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__asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x)); |
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__asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x)); |
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__asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x)); |
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return result; |
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} |
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) |
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SDL_FORCE_INLINE Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); |
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return x; |
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} |
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#elif defined(__WATCOMC__) && defined(__386__) |
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extern _inline Uint32 SDL_Swap32(Uint32); |
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#ifndef __SW_3 /* 486+ */ |
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#pragma aux SDL_Swap32 = \ |
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"bswap eax" \ |
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parm [eax] \ |
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modify [eax]; |
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#else /* 386-only */ |
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#pragma aux SDL_Swap32 = \ |
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"xchg al, ah" \ |
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"ror eax, 16" \ |
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"xchg al, ah" \ |
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parm [eax] \ |
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modify [eax]; |
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#endif |
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#else |
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SDL_FORCE_INLINE Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | |
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((x >> 8) & 0x0000FF00) | (x >> 24))); |
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} |
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#endif |
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#if defined(__GNUC__) && defined(__i386__) |
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SDL_FORCE_INLINE Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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union |
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{ |
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struct |
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{ |
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Uint32 a, b; |
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} s; |
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Uint64 u; |
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} v; |
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v.u = x; |
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__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a), |
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"1"(v.s. |
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b)); |
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return v.u; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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SDL_FORCE_INLINE Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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__asm__("bswapq %0": "=r"(x):"0"(x)); |
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return x; |
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} |
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#else |
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SDL_FORCE_INLINE Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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Uint32 hi, lo; |
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/* Separate into high and low 32-bit values and swap them */ |
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lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); |
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x >>= 32; |
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hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); |
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x = SDL_Swap32(lo); |
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x <<= 32; |
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x |= SDL_Swap32(hi); |
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return (x); |
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} |
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#endif |
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SDL_FORCE_INLINE float |
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SDL_SwapFloat(float x) |
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{ |
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union |
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{ |
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float f; |
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Uint32 ui32; |
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} swapper; |
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swapper.f = x; |
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swapper.ui32 = SDL_Swap32(swapper.ui32); |
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return swapper.f; |
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} |
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/** |
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* \name Swap to native |
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* Byteswap item from the specified endianness to the native endianness. |
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*/ |
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/* @{ */ |
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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#define SDL_SwapLE16(X) (X) |
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#define SDL_SwapLE32(X) (X) |
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#define SDL_SwapLE64(X) (X) |
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#define SDL_SwapFloatLE(X) (X) |
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#define SDL_SwapBE16(X) SDL_Swap16(X) |
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#define SDL_SwapBE32(X) SDL_Swap32(X) |
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#define SDL_SwapBE64(X) SDL_Swap64(X) |
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#define SDL_SwapFloatBE(X) SDL_SwapFloat(X) |
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#else |
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#define SDL_SwapLE16(X) SDL_Swap16(X) |
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#define SDL_SwapLE32(X) SDL_Swap32(X) |
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#define SDL_SwapLE64(X) SDL_Swap64(X) |
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#define SDL_SwapFloatLE(X) SDL_SwapFloat(X) |
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#define SDL_SwapBE16(X) (X) |
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#define SDL_SwapBE32(X) (X) |
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#define SDL_SwapBE64(X) (X) |
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#define SDL_SwapFloatBE(X) (X) |
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#endif |
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/* @} *//* Swap to native */ |
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/* Ends C function definitions when using C++ */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#include "close_code.h" |
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#endif /* SDL_endian_h_ */ |
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/* vi: set ts=4 sw=4 expandtab: */
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