constsize_t _Byte_size = _Needle_length *sizeof(_Ty);

constexprsize_t _Vec_size =sizeof(_Mask);

constexprsize_t _Vec_mask = _Vec_size -1;

static_assert((_Vec_size & _Vec_mask) ==0);

constvoid* _Stop = _Needle_ptr;

_Advance_bytes(_Stop, _Byte_size & ~size_t{0x1F});

for (; _Needle_ptr != _Stop; _Needle_ptr +=32 /sizeof(_Ty)) {

_Advance_bytes(_Stop, _Byte_size & ~_Vec_mask);

for (; _Needle_ptr != _Stop; _Needle_ptr +=_Vec_size /sizeof(_Ty)) {

const __m128i _Data =_mm_loadu_si128(reinterpret_cast<const __m128i*>(_Needle_ptr));

if (!_mm_testz_si128(_Mask, _Data)) {

returnfalse;

}

}

_Advance_bytes(_Stop, _Byte_size &0x1E);

_Advance_bytes(_Stop, _Byte_size &_Vec_mask);

for (; _Needle_ptr != _Stop; ++_Needle_ptr) {

if ((*_Needle_ptr & ~_Ty{0xFF}) !=0) {

returnfalse;