stellar

UCI Chess engine written in C++20

git clone git://git.dimitrijedobrota.com/stellar.git

commit	500ef277aef9ef459745b6d68e39cd092c0a4103
parent	177bc921f0554ab8d0059328fbe2880333e7d2a6
author	Dimitrije Dobrota <mail@dimitrijedobrota.com>
date	Tue, 20 Sep 2022 22:05:01 +0200

get_random_U64_number() and generata_magic_number() functions

Diffstat:

src/engine.c

+++++++++++++++++++++++++++++++++-----------------

1 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/src/engine.c b/src/engine.c

@@ -12,6 +12,7 @@

#define MAX(a, b) ((a > b) ? a : b)

#define MIN(a, b) ((a < b) ? a : b)

// define number types

typedef unsigned long long U64; // define bitboard data type

#define C64(constantU64) constantU64##ULL // define shorthand for constants

@@ -46,6 +47,36 @@ static inline int bit_lsb_index(U64 bitboard) {

return bit_count((bitboard & -bitboard) - 1);

}

// pseudo random numbers

U32 state = C32(1804289383);

U32 get_random_U32_number() {

U32 number = state;

number ^= number << 13;

number ^= number >> 17;

number ^= number << 5;

return state = number;

}

U64 get_random_U64_number() {

U64 n1, n2, n3, n4;

n1 = (U64)(get_random_U32_number()) & C64(0xFFFF);

n2 = (U64)(get_random_U32_number()) & C64(0xFFFF);

n3 = (U64)(get_random_U32_number()) & C64(0xFFFF);

n4 = (U64)(get_random_U32_number()) & C64(0xFFFF);

return n1 | (n2 << 16) | (n3 << 32) | (n4 << 48);

}

U64 generate_magic_number() {

return get_random_U64_number() & get_random_U64_number() &

get_random_U64_number();

}

// squares

// clang-format off

enum enumSquare {

@@ -285,24 +316,9 @@ U64 set_occupancy(int index, int bits_in_mask, U64 attack_mask) {

return occupancy;

}

// pseudo random number state

U32 state = C32(1804289383);

U32 get_random_U32_number() {

U32 number = state;

number ^= number << 13;

number ^= number >> 17;

number ^= number << 5;

return state = number;

}

int main(void) {

init_leapers_attacks();

printf("%u\n", get_random_U32_number());

bitboard_print(generate_magic_number());

return 0;

}