weaselab/conflict-set
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32-bit x86 simd for the other scan16 too
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Andrew Noyes
2024-06-29 15:10:05 -07:00
parent 75499543e7
commit 461e07822a
1 changed files with 14 additions and 0 deletions
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14
ConflictSet.cpp
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@@ -1895,6 +1895,20 @@ inline __attribute((always_inline)) bool scan16(const InternalVersionT *vs,
conflict &= end == 16 ? -1 : (uint64_t(1) << (end << 2)) - 1;
conflict >>= begin << 2;
return !conflict;
#elif INTERNAL_VERSION_32_BIT && defined(HAS_AVX)
__m128i w4[4];
memcpy(w4, vs, sizeof(w4));
uint32_t rv;
memcpy(&rv, &readVersion, sizeof(rv));
const auto rvVec = _mm_set1_epi32(rv);
const auto zero = _mm_setzero_si128();
uint32_t conflict = 0;
for (int i = 0; i < 4; ++i) {
conflict |= _mm_movemask_ps(_mm_cmpgt_epi32(_mm_sub_epi32(w4[i], rvVec), zero)) << (i * 4);
}
conflict &= (1 << end) - 1;
conflict >>= begin;
return !conflict;
#else
uint64_t conflict = 0;
for (int i = 0; i < 16; ++i) {