stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
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commit16857abdfb0dc9513882aa1ed00e7ffe2776116c
parentb6be584c1ee1da0b25461b87a4e1364554284f96
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateMon, 19 Sep 2022 19:38:55 +0200

Add Bit Count function

Diffstat:
Msrc/engine.c|+++++++++++++

1 files changed, 13 insertions(+), 0 deletions(-)

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

@@ -25,6 +25,17 @@ const U64 notHFile = C64(0x7f7f7f7f7f7f7f7f); // ~0x8080808080808080

#define bit_set(bitboard, square) ((bitboard) |= C64(1) << (square))
#define bit_pop(bitboard, square) ((bitboard) &= ~(C64(1) << (square)))
static inline int bit_count(U64 bitboard) {
int count = 0;
while (bitboard > 0) {
count++;
bitboard &= bitboard - 1;
}
return count;
}
// squares
// clang-format off
enum enumSquare {

@@ -237,5 +248,7 @@ int main(void) {

for (int square = 0; square < 64; square++)
bitboard_print(mask_bishop_attacks(square));
printf("%d\n", bit_count(block));
return 0;
}