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Assorted trivial cleanups 2/2019

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No functional change.
This commit is contained in:
Marco Costalba
2019-02-08 10:36:03 +01:00
parent c2fb0ff720
commit 2bceba7f51
10 changed files with 90 additions and 86 deletions
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27
src/bitboard.cpp
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@@ -24,7 +24,7 @@
#include "misc.h"
uint8_t PopCnt16[1 << 16];
int8_t SquareDistance[SQUARE_NB][SQUARE_NB];
uint8_t SquareDistance[SQUARE_NB][SQUARE_NB];
Bitboard SquareBB[SQUARE_NB];
Bitboard ForwardRanksBB[COLOR_NB][RANK_NB];
@@ -34,6 +34,12 @@ Bitboard DistanceRingBB[SQUARE_NB][8];
Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
Bitboard PawnAttacks[COLOR_NB][SQUARE_NB];
Bitboard KingFlank[FILE_NB] = {
QueenSide ^ FileDBB, QueenSide, QueenSide,
CenterFiles, CenterFiles,
KingSide, KingSide, KingSide ^ FileEBB
};
Magic RookMagics[SQUARE_NB];
Magic BishopMagics[SQUARE_NB];
@@ -45,7 +51,6 @@ namespace {
void init_magics(Bitboard table[], Magic magics[], Direction directions[]);
// popcount16() counts the non-zero bits using SWAR-Popcount algorithm
unsigned popcount16(unsigned u) {
u -= (u >> 1) & 0x5555U;
u = ((u >> 2) & 0x3333U) + (u & 0x3333U);
@@ -80,17 +85,13 @@ const std::string Bitboards::pretty(Bitboard b) {
void Bitboards::init() {
for (unsigned i = 0; i < (1 << 16); ++i)
PopCnt16[i] = (uint8_t) popcount16(i);
PopCnt16[i] = (uint8_t)popcount16(i);
for (Square s = SQ_A1; s <= SQ_H8; ++s)
SquareBB[s] = (1ULL << s);
for (Rank r = RANK_1; r < RANK_8; ++r)
ForwardRanksBB[WHITE][r] = ~(ForwardRanksBB[BLACK][r + 1] = ForwardRanksBB[BLACK][r] | rank_bb(r));
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
if (s1 != s2)
{
SquareDistance[s1][s2] = std::max(distance<File>(s1, s2), distance<Rank>(s1, s2));
DistanceRingBB[s1][SquareDistance[s1][s2]] |= s2;
@@ -127,13 +128,11 @@ void Bitboards::init() {
for (PieceType pt : { BISHOP, ROOK })
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
{
if (!(PseudoAttacks[pt][s1] & s2))
continue;
LineBB[s1][s2] = (attacks_bb(pt, s1, 0) & attacks_bb(pt, s2, 0)) | s1 | s2;
BetweenBB[s1][s2] = attacks_bb(pt, s1, SquareBB[s2]) & attacks_bb(pt, s2, SquareBB[s1]);
}
if (PseudoAttacks[pt][s1] & s2)
{
LineBB[s1][s2] = (attacks_bb(pt, s1, 0) & attacks_bb(pt, s2, 0)) | s1 | s2;
BetweenBB[s1][s2] = attacks_bb(pt, s1, SquareBB[s2]) & attacks_bb(pt, s2, SquareBB[s1]);
}
}
}