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Silence idiotic warning on two's complement of an unsigned

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MSVC gives:

warning C4146: unary minus operator applied to unsigned type,
               result still unsigned

When finds -b where b is an unsigned integer. So rewrite the two's
complement in a way to avoid the warning. Theoretically the new
version is slower, but in practice changes nothing.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-03-30 12:07:45 +02:00
parent 683595fee1
commit d7ef09727a
1 changed files with 1 additions and 1 deletions
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2
src/position.cpp
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@@ -1618,7 +1618,7 @@ int Position::see(Square from, Square to) const {
// Remove the attacker we just found from the 'attackers' bitboard, // Remove the attacker we just found from the 'attackers' bitboard,
// and scan for new X-ray attacks behind the attacker. // and scan for new X-ray attacks behind the attacker.
b = attackers & pieces_of_color_and_type(c, pt); b = attackers & pieces_of_color_and_type(c, pt);
occ ^= (b & -b); occ ^= (b & (~b + 1));
attackers |= (rook_attacks_bb(to, occ) & rooks_and_queens()) attackers |= (rook_attacks_bb(to, occ) & rooks_and_queens())
| (bishop_attacks_bb(to, occ) & bishops_and_queens()); | (bishop_attacks_bb(to, occ) & bishops_and_queens());