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28 lines
941 B
28 lines
941 B
5 years ago
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#ifndef BITWISE_H
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#define BITWISE_H
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// Using macros for ease of use, can also use inline functons, but I don't see the point.
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/*
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* From (Position): 6 bits (2^6 == 64) possibilities
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* To (Position): same as above
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* Captured piece, if any: 4 bits (16) possibilities
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* Promoted to, if any: 4 bits (16) possibilities
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* en passant flag: 1 bit
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* pawn starting move flag: 1 bit
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* castle move flag: 1 bit
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*
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* 0000 0000 0000 0000 0011 1111 -> From square position (0x3F)
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* 0000 0000 0000 1111 1100 0000 -> To square position (>> 6 0xFB)
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* 0000 0000 1111 0000 0000 0000 -> captured piece, if any (>> 12 0xF)
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* 0000 1111 0000 0000 0000 0000 -> if prmoted, what to? (>> 16 0xF)
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* 0001 0000 0000 0000 0000 0000 -> en passant (0x100000)
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* 0010 0000 0000 0000 0000 0000 -> pawn starting move (0x200000)
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* 0100 0000 0000 0000 0000 0000 -> castle move (0x400000)
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* */
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#define FROMSQ(m) ((m) & 0x3f)
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#define TOSQ(m) ((m>>6) & 0x3f)
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#endif
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