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Dumb7Fill.hpp
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Dumb7Fill.hpp
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#pragma once
#include <cstdint>
namespace Chess_Lookup::Dumb7Fill {
using U64 = uint64_t;
constexpr auto Size = 0;
static constexpr uint64_t north(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
uint64_t flood = index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
index = (index << 8) & empty;
flood |= index;
return (flood << 8) & 18446744073709551615U;
}
static constexpr uint64_t south(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
uint64_t flood = index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
index = (index >> 8) & empty;
flood |= index;
return (flood >> 8) & 18446744073709551615U;
}
static constexpr uint64_t east(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0xfefefefefefefefe;
uint64_t flood = index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
index = (index << 1) & empty;
flood |= index;
return (flood << 1) & 0xfefefefefefefefe;
}
static constexpr uint64_t west(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0x7f7f7f7f7f7f7f7f;
uint64_t flood = index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
index = (index >> 1) & empty;
flood |= index;
return (flood >> 1) & 0x7f7f7f7f7f7f7f7f;
}
static constexpr uint64_t noEa(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0xfefefefefefefefe;
uint64_t flood = index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
index = (index << 9) & empty;
flood |= index;
return (flood << 9) & 0xfefefefefefefefe;
}
static constexpr uint64_t soEa(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0xfefefefefefefefe;
uint64_t flood = index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
index = (index >> 7) & empty;
flood |= index;
return (flood >> 7) & 0xfefefefefefefefe;
}
static constexpr uint64_t noWe(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0x7f7f7f7f7f7f7f7f;
uint64_t flood = index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
index = (index << 7) & empty;
flood |= index;
return (flood << 7) & 0x7f7f7f7f7f7f7f7f;
}
static constexpr uint64_t soWe(uint64_t index, uint64_t empty) {
empty ^= 18446744073709551615U;
empty &= 0x7f7f7f7f7f7f7f7f;
uint64_t flood = index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
index = (index >> 9) & empty;
flood |= index;
return (flood >> 9) & 0x7f7f7f7f7f7f7f7f;
}
static constexpr uint64_t Bishop(int sq, uint64_t occ)
{
uint64_t bishop = 1ull << sq;
return noEa(bishop, occ) |
soEa(bishop, occ) |
soWe(bishop, occ) |
noWe(bishop, occ);
}
static constexpr uint64_t Rook(int sq, uint64_t occ)
{
uint64_t rook = 1ull << sq;
return south(rook, occ) |
north(rook, occ) |
east(rook, occ) |
west(rook, occ);
}
static constexpr uint64_t Queen(int sq, uint64_t occ)
{
return Bishop(sq, occ) | Rook(sq, occ);
}
}