2014-08-16 23:18:37 +00:00
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#include <emmintrin.h>
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#include <DB/Columns/IColumn.h>
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namespace DB
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{
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size_t countBytesInFilter(const IColumn::Filter & filt)
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{
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size_t count = 0;
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/** NOTE: По идее, filt должен содержать только нолики и единички.
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* Но, на всякий случай, здесь используется условие > 0 (на знаковые байты).
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* Лучше было бы использовать != 0, то это не позволяет SSE2.
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*/
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const __m128i zero16 = _mm_set1_epi8(0);
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const Int8 * pos = reinterpret_cast<const Int8 *>(&filt[0]);
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const Int8 * end = pos + filt.size();
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const Int8 * end64 = pos + filt.size() / 64 * 64;
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for (; pos < end64; pos += 64)
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2014-08-17 05:12:46 +00:00
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count += __builtin_popcountll(
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2014-08-16 23:18:37 +00:00
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static_cast<UInt64>(_mm_movemask_epi8(_mm_cmpgt_epi8(
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(pos)),
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zero16)))
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(pos + 16)),
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zero16))) << 16)
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(pos + 32)),
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zero16))) << 32)
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(pos + 48)),
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zero16))) << 48));
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for (; pos < end; ++pos)
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count += *pos > 0;
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return count;
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}
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}
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