Author: Gerd Isenberg
Date: 15:55:09 10/22/02
Go up one level in this thread
On October 22, 2002 at 18:52:11, Gerd Isenberg wrote:
>On October 22, 2002 at 18:47:54, Gerd Isenberg wrote:
>
>>one possible improvement :-)
>>
>>I would guess this reduces dependencies and may shlightly or microscopic faster:
>>
>>bitboard WhitePawnAttacks (bitboard b)
>>{
>> bitboard c = b;
>> b ^= b; // b ^= c has to wait for the previous instruction
>> b |= (c << 7) & 0x7F7F7F7F7F7F7F7F;
>> b |= (c << 9) & 0xFEFEFEFEFEFEFEFE;
>> return b;
>>}
>>
>>Gerd
>
>Or of course:
>
>bitboard WhitePawnAttacks (bitboard b)
>{
> bitboard c = b;
> b = (c << 7) & 0x7F7F7F7F7F7F7F7F;
> b |= (c << 9) & 0xFEFEFEFEFEFEFEFE;
> return b;
>}
what about this:
bitboard WhitePawnAttacks (bitboard b)
{
return ((b << 7) & 0x7F7F7F7F7F7F7F7F)
|((b << 9) & 0xFEFEFEFEFEFEFEFE);
}
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