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Last logic fixes for BitArray

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This commit is contained in:
Lander Gallastegi 2025-06-08 18:42:00 +02:00
parent bf10666578
commit 14a33d35a2
1 changed files with 8 additions and 8 deletions
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16
src/common/bit_array.h
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@ -228,18 +228,18 @@ public:
} }
Range LastRegionFrom(size_t end) const { Range LastRegionFrom(size_t end) const {
if (end >= N) {
return {N, N};
}
if (end == 0) { if (end == 0) {
return {0, 0}; return {0, 0};
} }
if (end > N) {
end = N;
}
const auto find_start_bit = [&](size_t word) { const auto find_start_bit = [&](size_t word) {
#ifdef BIT_ARRAY_USE_AVX #ifdef BIT_ARRAY_USE_AVX
const __m256i all_zero = _mm256_setzero_si256(); const __m256i all_zero = _mm256_setzero_si256();
for (; word >= WORDS_PER_AVX; word -= WORDS_PER_AVX) { for (; word >= WORDS_PER_AVX; word -= WORDS_PER_AVX) {
const __m256i current = const __m256i current = _mm256_loadu_si256(
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(&data[word - WORDS_PER_AVX])); reinterpret_cast<const __m256i*>(&data[word - WORDS_PER_AVX]));
const __m256i cmp = _mm256_cmpeq_epi64(current, all_zero); const __m256i cmp = _mm256_cmpeq_epi64(current, all_zero);
if (_mm256_movemask_epi8(cmp) != 0xFFFFFFFF) { if (_mm256_movemask_epi8(cmp) != 0xFFFFFFFF) {
break; break;
@ -247,8 +247,8 @@ public:
} }
#endif #endif
for (; word > 0; --word) { for (; word > 0; --word) {
if (data[word - 1] != 0) { if (data[word - 1] != ~0ULL) {
return word * BITS_PER_WORD - std::countl_zero(data[word - 1]); return word * BITS_PER_WORD - std::countl_one(data[word - 1]);
} }
} }
return size_t(0); return size_t(0);
@ -290,7 +290,7 @@ public:
} }
inline constexpr Range LastRegion() const { inline constexpr Range LastRegion() const {
return LastRegionFrom(0); return LastRegionFrom(N);
} }
inline constexpr size_t Size() const { inline constexpr size_t Size() const {