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.
-
-/// Intel PEXT (parallel extraction) software implementation
-Bitboard pext(Bitboard b, Bitboard mask) {
-
- Bitboard res = 0;
-
- for (Bitboard bb = 1; mask; bb += bb)
- {
- if (b & mask & -mask)
- res |= bb;
-
- mask &= mask - 1;
- }
- return res;
-}
-
-
/// lsb()/msb() finds the least/most significant bit in a non-zero bitboard.
/// pop_lsb() finds and clears the least significant bit in a non-zero bitboard.
/// lsb()/msb() finds the least/most significant bit in a non-zero bitboard.
/// pop_lsb() finds and clears the least significant bit in a non-zero bitboard.
reference[size] = sliding_attack(deltas, s, b);
if (HasPext)
reference[size] = sliding_attack(deltas, s, b);
if (HasPext)
- attacks[s][pext(occupancy[size], masks[s])] = reference[size];
+ attacks[s][_pext_u64(b, masks[s])] = reference[size];
size++;
b = (b - masks[s]) & masks[s];
size++;
b = (b - masks[s]) & masks[s];
-extern Bitboard pext(Bitboard b, Bitboard mask);
-
namespace Bitboards {
void init();
namespace Bitboards {
void init();
unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
if (HasPext)
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]);
if (Is64Bit)
return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);
# include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
#endif
# include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
#endif
+#if defined(USE_PEXT)
+# include <x86intrin.h> // Gcc header for _pext_u64() intrinsic
+#else
+# define _pext_u64(b, m) (0)
+#endif
+
# if !defined(NO_PREFETCH) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))
# include <xmmintrin.h> // Intel and Microsoft header for _mm_prefetch()
# endif
# if !defined(NO_PREFETCH) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))
# include <xmmintrin.h> // Intel and Microsoft header for _mm_prefetch()
# endif