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| 1 | +use crate::types::{Bitboard, Color, File, Rank}; |
| 2 | + |
| 3 | +const A: Bitboard = Bitboard::file(File::A); |
| 4 | +const B: Bitboard = Bitboard::file(File::B); |
| 5 | +const G: Bitboard = Bitboard::file(File::G); |
| 6 | +const H: Bitboard = Bitboard::file(File::H); |
| 7 | +const R1: Bitboard = Bitboard::rank(Rank::R1); |
| 8 | +const R2: Bitboard = Bitboard::rank(Rank::R2); |
| 9 | +const R7: Bitboard = Bitboard::rank(Rank::R7); |
| 10 | +const R8: Bitboard = Bitboard::rank(Rank::R8); |
| 11 | + |
| 12 | +pub fn pawn_attacks_setwise(bb: Bitboard, color: Color) -> Bitboard { |
| 13 | + let (up_right, up_left) = match color { |
| 14 | + Color::White => (9, 7), |
| 15 | + Color::Black => (-7, -9), |
| 16 | + }; |
| 17 | + |
| 18 | + let right_attacks = (bb & !Bitboard::file(File::H)).shift(up_right); |
| 19 | + let left_attacks = (bb & !Bitboard::file(File::A)).shift(up_left); |
| 20 | + |
| 21 | + right_attacks | left_attacks |
| 22 | +} |
| 23 | + |
| 24 | +#[cfg(not(target_feature = "avx2"))] |
| 25 | +#[inline] |
| 26 | +pub fn knight_attacks_setwise(bb: Bitboard) -> Bitboard { |
| 27 | + (bb & !(A | B | R8)).shift(6) |
| 28 | + | (bb & !(A | R7 | R8)).shift(15) |
| 29 | + | (bb & !(H | R7 | R8)).shift(17) |
| 30 | + | (bb & !(G | H | R8)).shift(10) |
| 31 | + | (bb & !(G | H | R1)).shift(-6) |
| 32 | + | (bb & !(H | R1 | R2)).shift(-15) |
| 33 | + | (bb & !(A | R1 | R2)).shift(-17) |
| 34 | + | (bb & !(A | B | R1)).shift(-10) |
| 35 | +} |
| 36 | + |
| 37 | +#[cfg(target_feature = "avx2")] |
| 38 | +#[inline] |
| 39 | +pub fn knight_attacks_setwise(bb: Bitboard) -> Bitboard { |
| 40 | + use core::arch::x86_64::*; |
| 41 | + |
| 42 | + unsafe { |
| 43 | + let mask_a = _mm256_set_epi64x( |
| 44 | + !(A | B | R8).0 as i64, |
| 45 | + !(A | R7 | R8).0 as i64, |
| 46 | + !(H | R7 | R8).0 as i64, |
| 47 | + !(G | H | R8).0 as i64, |
| 48 | + ); |
| 49 | + let mask_b = _mm256_set_epi64x( |
| 50 | + !(G | H | R1).0 as i64, |
| 51 | + !(H | R1 | R2).0 as i64, |
| 52 | + !(A | R1 | R2).0 as i64, |
| 53 | + !(A | B | R1).0 as i64, |
| 54 | + ); |
| 55 | + |
| 56 | + let bb = _mm256_set1_epi64x(bb.0 as i64); |
| 57 | + let a = _mm256_and_si256(bb, mask_a); |
| 58 | + let b = _mm256_and_si256(bb, mask_b); |
| 59 | + let a = _mm256_sllv_epi64(a, _mm256_set_epi64x(6, 15, 17, 10)); |
| 60 | + let b = _mm256_srlv_epi64(b, _mm256_set_epi64x(6, 15, 17, 10)); |
| 61 | + fold_to_bitboard(_mm256_or_si256(a, b)) |
| 62 | + } |
| 63 | +} |
| 64 | + |
| 65 | +#[cfg(not(target_feature = "avx512f"))] |
| 66 | +#[inline] |
| 67 | +pub fn bishop_attacks_setwise(bb: Bitboard, occupancies: Bitboard) -> Bitboard { |
| 68 | + use crate::lookup::bishop_attacks; |
| 69 | + |
| 70 | + let mut result = Bitboard(0); |
| 71 | + for square in bb { |
| 72 | + result |= bishop_attacks(square, occupancies); |
| 73 | + } |
| 74 | + result |
| 75 | +} |
| 76 | + |
| 77 | +#[cfg(target_feature = "avx512f")] |
| 78 | +#[inline] |
| 79 | +pub fn bishop_attacks_setwise(bb: Bitboard, occupancies: Bitboard) -> Bitboard { |
| 80 | + use std::arch::x86_64::*; |
| 81 | + |
| 82 | + unsafe { |
| 83 | + let attackers = _mm256_set1_epi64x(bb.0 as i64); |
| 84 | + let rotates1 = _mm256_set_epi64x(-9, -7, 7, 9); |
| 85 | + let rotates2 = _mm256_add_epi64(rotates1, rotates1); |
| 86 | + let rotates4 = _mm256_add_epi64(rotates2, rotates2); |
| 87 | + |
| 88 | + let mask = _mm256_set_epi64x(!(R8 | H).0 as i64, !(R8 | A).0 as i64, !(R1 | H).0 as i64, !(R1 | A).0 as i64); |
| 89 | + |
| 90 | + let generate = attackers; |
| 91 | + let propagate = _mm256_and_si256(_mm256_set1_epi64x(!occupancies.0 as i64), mask); |
| 92 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates1))); |
| 93 | + let propagate = _mm256_and_si256(propagate, _mm256_rolv_epi64(propagate, rotates1)); |
| 94 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates2))); |
| 95 | + let propagate = _mm256_and_si256(propagate, _mm256_rolv_epi64(propagate, rotates2)); |
| 96 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates4))); |
| 97 | + let attacks = _mm256_and_si256(_mm256_rolv_epi64(generate, rotates1), mask); |
| 98 | + |
| 99 | + fold_to_bitboard(attacks) |
| 100 | + } |
| 101 | +} |
| 102 | + |
| 103 | +#[cfg(not(target_feature = "avx512f"))] |
| 104 | +#[inline] |
| 105 | +pub fn rook_attacks_setwise(bb: Bitboard, occupancies: Bitboard) -> Bitboard { |
| 106 | + use crate::lookup::rook_attacks; |
| 107 | + |
| 108 | + let mut result = Bitboard(0); |
| 109 | + for square in bb { |
| 110 | + result |= rook_attacks(square, occupancies); |
| 111 | + } |
| 112 | + result |
| 113 | +} |
| 114 | + |
| 115 | +#[cfg(target_feature = "avx512f")] |
| 116 | +#[inline] |
| 117 | +pub fn rook_attacks_setwise(bb: Bitboard, occupancies: Bitboard) -> Bitboard { |
| 118 | + use std::arch::x86_64::*; |
| 119 | + |
| 120 | + unsafe { |
| 121 | + let attackers = _mm256_set1_epi64x(bb.0 as i64); |
| 122 | + let rotates1 = _mm256_set_epi64x(-8, -1, 1, 8); |
| 123 | + let rotates2 = _mm256_add_epi64(rotates1, rotates1); |
| 124 | + let rotates4 = _mm256_add_epi64(rotates2, rotates2); |
| 125 | + |
| 126 | + let mask = _mm256_set_epi64x(!R8.0 as i64, !H.0 as i64, !A.0 as i64, !R1.0 as i64); |
| 127 | + |
| 128 | + let generate = attackers; |
| 129 | + let propagate = _mm256_and_si256(_mm256_set1_epi64x(!occupancies.0 as i64), mask); |
| 130 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates1))); |
| 131 | + let propagate = _mm256_and_si256(propagate, _mm256_rolv_epi64(propagate, rotates1)); |
| 132 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates2))); |
| 133 | + let propagate = _mm256_and_si256(propagate, _mm256_rolv_epi64(propagate, rotates2)); |
| 134 | + let generate = _mm256_or_si256(generate, _mm256_and_si256(propagate, _mm256_rolv_epi64(generate, rotates4))); |
| 135 | + let attacks = _mm256_and_si256(_mm256_rolv_epi64(generate, rotates1), mask); |
| 136 | + |
| 137 | + fold_to_bitboard(attacks) |
| 138 | + } |
| 139 | +} |
| 140 | + |
| 141 | +#[cfg(target_feature = "avx2")] |
| 142 | +#[inline] |
| 143 | +unsafe fn fold_to_bitboard(vector: core::arch::x86_64::__m256i) -> Bitboard { |
| 144 | + use core::arch::x86_64::*; |
| 145 | + |
| 146 | + let vector = _mm_or_si128(_mm256_castsi256_si128(vector), _mm256_extracti128_si256::<1>(vector)); |
| 147 | + let result = _mm_extract_epi64::<0>(vector) | _mm_extract_epi64::<1>(vector); |
| 148 | + Bitboard(result as u64) |
| 149 | +} |
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