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replace memset in GetHashTable to pure SIMD #157

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replace memset in GetHashTable to pure SIMD #157

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11 changes: 10 additions & 1 deletion snappy.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -703,8 +703,17 @@ WorkingMemory::~WorkingMemory() {
uint16_t* WorkingMemory::GetHashTable(size_t fragment_size,
int* table_size) const {
const size_t htsize = CalculateTableSize(fragment_size);
memset(table_, 0, htsize * sizeof(*table_));
*table_size = htsize;
#if SNAPPY_HAVE_VECTOR_BYTE_SHUFFLE
assert(table_size % 16 == 0);
table_[0] = 0;
V128 pattern = V128_DupChar(table_[0]);
for(uint64_t i = 0; i < htsize * sizeof(*table_) / 16; i++ ) {
V128_StoreU(reinterpret_cast<V128*>(reinterpret_cast<char*>(table_) + 16 * i), pattern);
}
#else
memset(table_, 0, htsize * sizeof(*table_));
#endif
return table_;
}
} // end namespace internal
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