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Add prefetch to xxhash func on gcc at least.

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Improves hashing speed on Android by ~18%.
This commit is contained in:
Unknown W. Brackets 2014-03-24 23:48:38 -07:00
parent 2240cae3bf
commit 3ec61274fa
1 changed files with 3 additions and 0 deletions
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3
ext/xxhash.c
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@ -223,6 +223,9 @@ FORCE_INLINE U32 XXH32_endian_align(const void* input, int len, U32 seed, XXH_en
do
{
#if defined(ARM) && defined(__GNUC__)
__builtin_prefetch(p + 0xc0, 0, 0);
#endif
v1 += XXH_readLE32_align((const U32*)p, endian, align) * PRIME32_2; v1 = XXH_rotl32(v1, 13); v1 *= PRIME32_1; p+=4;
v2 += XXH_readLE32_align((const U32*)p, endian, align) * PRIME32_2; v2 = XXH_rotl32(v2, 13); v2 *= PRIME32_1; p+=4;
v3 += XXH_readLE32_align((const U32*)p, endian, align) * PRIME32_2; v3 = XXH_rotl32(v3, 13); v3 *= PRIME32_1; p+=4;