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Minor movegen speed-up #348

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Merged
TheRealGioviok merged 2 commits into from
Jan 5, 2026
Merged

Minor movegen speed-up #348

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9e50fd3
pinner speedup
87flowers Jan 4, 2026
5b6a00f
Bench: 13398527
87flowers Jan 5, 2026
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9 changes: 9 additions & 0 deletions src/geometry.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,15 @@ forceinline u64 closest(u64 occupied) {
return x & occupied;
}

forceinline m8x64 ray_fill(m8x64 x) {
#if LPS_AVX512
u64 y = (x.raw + 0x7E7E7E7E7E7E7E7E) & 0x8080808080808080;
return m8x64{(y - (y >> 7)) << 1};
#else
return std::bit_cast<m8x64>(std::bit_cast<u64x8>(x).nonzeros());
#endif
}

forceinline m8x64 attackers_from_rays(u8x64 ray_places) {
constexpr u8 K = 1 << 0;
constexpr u8 WP = 1 << 1;
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13 changes: 3 additions & 10 deletions src/position.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -573,16 +573,9 @@ std::tuple<Wordboard, Bitboard> Position::calc_pin_mask() const {
// Pinners are second-closest pieces that are enemy sliders of the correct type.
m8x64 pinner = maybe_pinner1 & maybe_pinner2;

// Does this ray have a pinner?
#if LPS_AVX512
const m8x16 has_attacker_vecmask = u8x16{_mm_set1_epi64x(pinner.raw)}.nonzeros();
const m8x64 pinned = m8x64{static_cast<u64>(
_mm_cvtsi128_si64(has_attacker_vecmask.mask(u8x16{_mm_set1_epi64x(maybe_pinned.raw)}).raw))};
#else
m8x64 no_pinner_mask = std::bit_cast<m8x64>(std::bit_cast<m64x8>(pinner).to_vector().zeros());
m8x64 pinned = maybe_pinned.andnot(no_pinner_mask);
#endif

// Does this ray have a pinner?
const m8x64 has_pinner = geometry::ray_fill(pinner);
const m8x64 pinned = maybe_pinned & has_pinner;

u8x64 nonmasked_pinned_ids =
geometry::lane_broadcast(pinned.mask(ray_places & u8x64::splat(0xF)));
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