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Switch to hardware PEXT

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Retire software pext and introduce hardware
call when USE_PEXT is defined during compilation.

This is a full complete implementation of sliding
attacks using PEXT.

No functional change.
This commit is contained in:
Marco Costalba
2014-04-07 21:04:34 +02:00
parent c556fe1d71
commit da2f8880b9
3 changed files with 8 additions and 21 deletions
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4
src/bitboard.h
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@@ -23,8 +23,6 @@
#include "types.h"
extern Bitboard pext(Bitboard b, Bitboard mask);
namespace Bitboards {
void init();
@@ -244,7 +242,7 @@ FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
if (HasPext)
return unsigned(pext(occ, Masks[s]));
return unsigned(_pext_u64(occ, Masks[s]));
if (Is64Bit)
return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);