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Unify BitCountType selection

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Now that HasPopCnt is a compile time constant we can
centralize and unify the BitCountType selection.

Also rename count_1s() in the more standard popcount()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-12-31 09:46:43 +01:00
parent fb4b4f772e
commit e9296d694c
6 changed files with 50 additions and 44 deletions
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4
src/bitboard.cpp
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@@ -154,7 +154,7 @@ Square pop_1st_bit(Bitboard* bb) {
void bitboards_init() {
for (Bitboard b = 0; b < 256; b++)
BitCount8Bit[b] = (uint8_t)count_1s<CNT32_MAX15>(b);
BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
for (Square s = SQ_A1; s <= SQ_H8; s++)
{
@@ -321,7 +321,7 @@ namespace {
// the number of 1s of the mask. Hence we deduce the size of the shift to
// apply to the 64 or 32 bits word to get the index.
masks[s] = sliding_attacks(pt, s, 0) & ~edges;
shifts[s] = (Is64Bit ? 64 : 32) - count_1s<CNT32_MAX15>(masks[s]);
shifts[s] = (Is64Bit ? 64 : 32) - popcount<Max15>(masks[s]);
// Use Carry-Rippler trick to enumerate all subsets of masks[s] and
// store the corresponding sliding attacks bitboard in reference[].