+
+/// 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;
+}
+
+