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replace memset in GetHashTable to pure SIMD

This commit is contained in:
zhuna.1024 2022-08-29 21:28:56 +08:00
parent af720f9a3b
commit 054ac58ae1
1 changed files with 10 additions and 1 deletions
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snappy.cc
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@ -703,8 +703,17 @@ WorkingMemory::~WorkingMemory() {
uint16_t* WorkingMemory::GetHashTable(size_t fragment_size, uint16_t* WorkingMemory::GetHashTable(size_t fragment_size,
int* table_size) const { int* table_size) const {
const size_t htsize = CalculateTableSize(fragment_size); const size_t htsize = CalculateTableSize(fragment_size);
memset(table_, 0, htsize * sizeof(*table_));
*table_size = htsize; *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_; return table_;
} }
} // end namespace internal } // end namespace internal