Replace MS1BTable[] with BitCount8Bit[]
We already have the necessary infrastructure in place. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>sf_2.3.1_base
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cc2b3ece5c
commit
46a50cbf38
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@ -58,7 +58,6 @@ namespace {
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CACHE_LINE_ALIGNMENT
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int BSFTable[64];
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int MS1BTable[256];
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Bitboard RTable[0x19000]; // Storage space for rook attacks
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Bitboard BTable[0x1480]; // Storage space for bishop attacks
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@ -139,25 +138,29 @@ Square pop_1st_bit(Bitboard* b) {
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return Square(BSFTable[((~(u.b.h ^ (u.b.h - 1))) * 0x783A9B23) >> 26]);
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}
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#endif // !defined(USE_BSFQ)
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#if !defined(USE_BSFQ)
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Square last_1(Bitboard b) {
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int result = 0;
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if (b > 0xFFFFFFFF) {
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b >>= 32;
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result = 32;
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if (b > 0xFFFFFFFF)
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{
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b >>= 32;
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result = 32;
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}
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if (b > 0xFFFF) {
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b >>= 16;
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result += 16;
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if (b > 0xFFFF)
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{
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b >>= 16;
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result += 16;
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}
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if (b > 0xFF) {
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b >>= 8;
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result += 8;
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if (b > 0xFF)
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{
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b >>= 8;
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result += 8;
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}
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return Square(result + MS1BTable[b]);
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return Square(result + BitCount8Bit[b]);
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}
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#endif // !defined(USE_BSFQ)
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@ -217,11 +220,6 @@ void bitboards_init() {
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else
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BSFTable[((1ULL << i) * 0x218A392CD3D5DBFULL) >> 58] = i;
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MS1BTable[0] = 0;
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for (int i = 0, k = 1; i < 8; i++)
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for (int j = 0; j < (1 << i); j++)
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MS1BTable[k++] = i;
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int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 },
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{}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } };
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@ -214,6 +214,7 @@ inline bool single_bit(Bitboard b) {
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return !(b & (b - 1));
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}
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/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
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/// pop_1st_bit() finds and clears the least significant nonzero bit in a
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/// nonzero bitboard.
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