349 lines
9.6 KiB
C
349 lines
9.6 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 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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#if defined(_MSC_VER) && (_MSC_VER >= 1400)
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/* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version,
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so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */
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#ifdef __clang__
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#ifndef __PRFCHWINTRIN_H
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#define __PRFCHWINTRIN_H
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static __inline__ void __attribute__((__always_inline__, __nodebug__))
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_m_prefetch(void *__P)
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{
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__builtin_prefetch(__P, 0, 3 /* _MM_HINT_T0 */);
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}
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#endif /* __PRFCHWINTRIN_H */
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#endif /* __clang__ */
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#include <intrin.h>
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#endif
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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__) || defined(__DragonFly__)
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#include <endian.h>
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#define SDL_BYTEORDER BYTE_ORDER
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#elif defined(__FreeBSD__) || defined(__NetBSD__)
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#include <sys/endian.h>
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#define SDL_BYTEORDER BYTE_ORDER
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/* predefs from newer gcc and clang versions: */
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#elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__)
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#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define SDL_BYTEORDER SDL_LIL_ENDIAN
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#elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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#define SDL_BYTEORDER SDL_BIG_ENDIAN
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#else
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#error Unsupported endianness
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#endif /**/
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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(__powerpc__) || defined(__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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#ifndef SDL_FLOATWORDORDER /* Not defined in SDL_config.h? */
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/* predefs from newer gcc versions: */
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#if defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__FLOAT_WORD_ORDER__)
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#if (__FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN
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#elif (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__)
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#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN
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#else
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#error Unsupported endianness
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#endif /**/
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#elif defined(__MAVERICK__)
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/* For Maverick, float words are always little-endian. */
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#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN
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#elif (defined(__arm__) || defined(__thumb__)) && !defined(__VFP_FP__) && !defined(__ARM_EABI__)
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/* For FPA, float words are always big-endian. */
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#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN
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#else
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/* By default, assume that floats words follow the memory system mode. */
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#define SDL_FLOATWORDORDER SDL_BYTEORDER
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#endif /* __FLOAT_WORD_ORDER__ */
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#endif /* !SDL_FLOATWORDORDER */
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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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/* various modern compilers may have builtin swap */
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#if defined(__GNUC__) || defined(__clang__)
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# define HAS_BUILTIN_BSWAP16 (_SDL_HAS_BUILTIN(__builtin_bswap16)) || \
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(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
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# define HAS_BUILTIN_BSWAP32 (_SDL_HAS_BUILTIN(__builtin_bswap32)) || \
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(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
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# define HAS_BUILTIN_BSWAP64 (_SDL_HAS_BUILTIN(__builtin_bswap64)) || \
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(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
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/* this one is broken */
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# define HAS_BROKEN_BSWAP (__GNUC__ == 2 && __GNUC_MINOR__ <= 95)
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#else
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# define HAS_BUILTIN_BSWAP16 0
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# define HAS_BUILTIN_BSWAP32 0
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# define HAS_BUILTIN_BSWAP64 0
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# define HAS_BROKEN_BSWAP 0
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#endif
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#if HAS_BUILTIN_BSWAP16
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#define SDL_Swap16(x) __builtin_bswap16(x)
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#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
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#pragma intrinsic(_byteswap_ushort)
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#define SDL_Swap16(x) _byteswap_ushort(x)
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#elif defined(__i386__) && !HAS_BROKEN_BSWAP
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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(__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(__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(__m68k__) && !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 HAS_BUILTIN_BSWAP32
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#define SDL_Swap32(x) __builtin_bswap32(x)
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#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
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#pragma intrinsic(_byteswap_ulong)
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#define SDL_Swap32(x) _byteswap_ulong(x)
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#elif defined(__i386__) && !HAS_BROKEN_BSWAP
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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(__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(__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(__m68k__) && !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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#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
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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 HAS_BUILTIN_BSWAP64
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#define SDL_Swap64(x) __builtin_bswap64(x)
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#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL)
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#pragma intrinsic(_byteswap_uint64)
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#define SDL_Swap64(x) _byteswap_uint64(x)
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#elif defined(__i386__) && !HAS_BROKEN_BSWAP
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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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struct {
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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"
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: "=r"(v.s.a), "=r"(v.s.b)
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: "0" (v.s.a), "1"(v.s.b));
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return v.u;
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}
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#elif 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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#elif defined(__WATCOMC__) && defined(__386__)
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extern __inline Uint64 SDL_Swap64(Uint64);
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#pragma aux SDL_Swap64 = \
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"bswap eax" \
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"bswap edx" \
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"xchg eax,edx" \
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parm [eax edx] \
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modify [eax edx];
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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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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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/* remove extra macros */
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#undef HAS_BROKEN_BSWAP
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#undef HAS_BUILTIN_BSWAP16
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#undef HAS_BUILTIN_BSWAP32
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#undef HAS_BUILTIN_BSWAP64
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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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