weaselab/conflict-set
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Use signed compare
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Unsigned compare is incorrect here
This commit is contained in:
Andrew Noyes
2024-09-13 22:55:22 -07:00
parent 0814822d82
commit 52201fa4c7
1 changed files with 10 additions and 3 deletions
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13
ConflictSet.cpp
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@@ -2925,11 +2925,18 @@ horizontalMaxUpTo16(InternalVersionT *vs, InternalVersionT z, int len) {
uint32_t zero;
memcpy(&zero, &z, sizeof(zero));
auto zeroVec = _mm512_set1_epi32(zero);
return InternalVersionT(
auto actual = InternalVersionT(
zero +
_mm512_reduce_max_epu32(_mm512_sub_epi32(
_mm512_reduce_max_epi32(_mm512_sub_epi32(
_mm512_mask_loadu_epi32(zeroVec, _mm512_int2mask((1 << len) - 1), vs),
zeroVec)));
// Hope it gets vectorized
InternalVersionT max = vs[0];
for (int i = 1; i < len; ++i) {
max = std::max(vs[i], max);
}
assert(actual == max);
return max;
#endif
}
__attribute__((target("default")))
@@ -2959,7 +2966,7 @@ horizontalMax16(InternalVersionT *vs, InternalVersionT z) {
uint32_t zero;
memcpy(&zero, &z, sizeof(zero));
auto zeroVec = _mm512_set1_epi32(zero);
return InternalVersionT(zero + _mm512_reduce_max_epu32(_mm512_sub_epi32(
return InternalVersionT(zero + _mm512_reduce_max_epi32(_mm512_sub_epi32(
_mm512_loadu_epi32(vs), zeroVec)));
#endif
}