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Use Clang/GCC builtins for SDL byteswapping functions 

__builtin_bswap32/64 were introduced in GCC 4.3. __builtin_bswap16 was
not available on x86 until GCC 4.8 due to a bug.

__builtin_bswap32/64 were introduced in Clang 2.6. __builtin_bswap16
was introduced in Clang 3.2.
This commit is contained in:
Cameron Gutman 2021-01-04 19:51:56 -06:00
parent e778881ada
commit 0f0946702d
1 changed files with 12 additions and 3 deletions
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15
include/SDL_endian.h
View File

@ -75,7 +75,10 @@ extern "C" {
/** /**
* \file SDL_endian.h * \file SDL_endian.h
*/ */
#if defined(__GNUC__) && defined(__i386__) && \ #if (defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 2))) || \
(defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
#define SDL_Swap16(x) __builtin_bswap16(x)
#elif defined(__GNUC__) && defined(__i386__) && \
!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
SDL_FORCE_INLINE Uint16 SDL_FORCE_INLINE Uint16
SDL_Swap16(Uint16 x) SDL_Swap16(Uint16 x)
@ -130,7 +133,10 @@ SDL_Swap16(Uint16 x)
} }
#endif #endif
#if defined(__GNUC__) && defined(__i386__) && \ #if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
(defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
#define SDL_Swap32(x) __builtin_bswap32(x)
#elif defined(__GNUC__) && defined(__i386__) && \
!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
SDL_FORCE_INLINE Uint32 SDL_FORCE_INLINE Uint32
SDL_Swap32(Uint32 x) SDL_Swap32(Uint32 x)
@ -197,7 +203,10 @@ SDL_Swap32(Uint32 x)
} }
#endif #endif
#if defined(__GNUC__) && defined(__i386__) && \ #if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
(defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
#define SDL_Swap64(x) __builtin_bswap64(x)
#elif defined(__GNUC__) && defined(__i386__) && \
!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
SDL_FORCE_INLINE Uint64 SDL_FORCE_INLINE Uint64
SDL_Swap64(Uint64 x) SDL_Swap64(Uint64 x)