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Merge pull request #269 from easyaspi314/endianness_fix

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Fix endianness detection on GCC, avoid XXH_cpuIsLittleEndian.
This commit is contained in:
Yann Collet 2019-10-04 13:38:51 -07:00 committed by GitHub
commit b604c7bee5
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2 changed files with 13 additions and 2 deletions
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6
xxh3.h
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@ -122,7 +122,8 @@
# define XXH_VECTOR XXH_SSE2
# elif defined(__GNUC__) /* msvc support maybe later */ \
&& (defined(__ARM_NEON__) || defined(__ARM_NEON)) \
&& defined(__LITTLE_ENDIAN__) /* ARM big endian is a thing */
&& (defined(__LITTLE_ENDIAN__) /* We only support little endian NEON */ \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
# define XXH_VECTOR XXH_NEON
# elif defined(__PPC64__) && defined(__POWER8_VECTOR__) && defined(__GNUC__)
# define XXH_VECTOR XXH_VSX
@ -165,7 +166,8 @@ typedef __vector unsigned char U8x16;
typedef __vector unsigned U32x4;
#ifndef XXH_VSX_BE
# ifdef __BIG_ENDIAN__
# if defined(__BIG_ENDIAN__) \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
# define XXH_VSX_BE 1
# elif defined(__VEC_ELEMENT_REG_ORDER__) && __VEC_ELEMENT_REG_ORDER__ == __ORDER_BIG_ENDIAN__
# warning "-maltivec=be is not recommended. Please use native endianness."

9
xxhash.c
View File

@ -211,12 +211,21 @@ typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianess;
/* XXH_CPU_LITTLE_ENDIAN can be defined externally, for example on the compiler command line */
#ifndef XXH_CPU_LITTLE_ENDIAN
# if defined(_WIN32) /* Windows is always little endian */ \
|| defined(__LITTLE_ENDIAN__) \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
# define XXH_CPU_LITTLE_ENDIAN 1
# elif defined(__BIG_ENDIAN__) \
|| (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
# define XXH_CPU_LITTLE_ENDIAN 0
# else
static int XXH_isLittleEndian(void)
{
const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
return one.c[0];
}
# define XXH_CPU_LITTLE_ENDIAN XXH_isLittleEndian()
# endif
#endif