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==Rotated Dot Product==
A little bit cheaper is to expand the bitboard to a vector or of 90 degree rotated {0,255} bytes, which requires a rotated weight vector as well <ref>[https://www.stmintz.com/ccc/index.php?id=377546 SSE2 bit<nowiki>[64] * byte[64]</nowiki> dot product] by [[Gerd Isenberg]], [[CCC]], July 17, 2004</ref>.
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/* for average weights < 64 */
