weaselab/conflict-set
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Find insertion point for Node16 with simd

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Closes #13
This commit is contained in:
Andrew Noyes
2024-03-28 10:47:20 -07:00
parent 14515e186a
commit 4edf0315d9
1 changed files with 38 additions and 0 deletions
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38
ConflictSet.cpp
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@@ -29,6 +29,7 @@ limitations under the License.
#include <span>
#include <string>
#include <string_view>
#include <type_traits>
#include <utility>
#ifdef HAS_AVX
@@ -954,6 +955,42 @@ Node *&getOrCreateChild(Node *&self, uint8_t index,
assert(self->getType() == Type_Node16);
++self->numChildren;
#ifdef HAS_AVX
__m128i key_vec = _mm_set1_epi8(index);
__m128i indices;
memcpy(&indices, self16->index, sizeof(self16->index));
__m128i results = _mm_cmpeq_epi8(key_vec, _mm_min_epu8(key_vec, indices));
int mask = (1 << (self->numChildren - 1)) - 1;
uint32_t bitfield = _mm_movemask_epi8(results) & mask;
bitfield |= uint32_t(1) << (self->numChildren - 1);
int i = std::countr_zero(bitfield);
if (i < self->numChildren - 1) {
memmove(self16->index + i + 1, self16->index + i,
self->numChildren - (i + 1));
memmove(self16->children + i + 1, self16->children + i,
(self->numChildren - (i + 1)) * sizeof(Child));
}
#elif defined(HAS_ARM_NEON)
uint8x16_t indices;
memcpy(&indices, self16->index, sizeof(self16->index));
// 0xff for each leq
auto results = vcleq_u8(vdupq_n_u8(index), indices);
uint64_t mask = (uint64_t(1) << ((self->numChildren - 1) * 4)) - 1;
// 0xf for each 0xff (within mask)
uint64_t bitfield =
vget_lane_u64(
vreinterpret_u64_u8(vshrn_n_u16(vreinterpretq_u16_u8(results), 4)),
0) &
mask;
bitfield |= uint64_t(0xf) << ((self->numChildren - 1) * 4);
int i = std::countr_zero(bitfield) / 4;
if (i < self->numChildren - 1) {
memmove(self16->index + i + 1, self16->index + i,
self->numChildren - (i + 1));
memmove(self16->children + i + 1, self16->children + i,
(self->numChildren - (i + 1)) * sizeof(Child));
}
#else
int i = 0;
for (; i < int(self->numChildren) - 1; ++i) {
if (int(self16->index[i]) > int(index)) {
@@ -964,6 +1001,7 @@ Node *&getOrCreateChild(Node *&self, uint8_t index,
break;
}
}
#endif
self16->index[i] = index;
auto &result = self16->children[i].child;
result = nullptr;