Author: leonid
Date: 20:51:03 06/26/00
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On June 26, 2000 at 21:50:59, Larry Griffiths wrote: >I was thinking it would be nice to have an instruction that would select bits >using a mask. > >It looks like Intel has a pmovmskb instruction that takes the high-order bit of >each byte in an MMX register and copies it to a destination register. The >description of this instruction is Move Byte Mask to Integer. This would work >for selecting out a rank from a file bitmap and vice-versa. > >I would like to see an instruction called Move Bit Mask to Integer. It would >select only the bits from the source register using a 64-bit mask register. I >could then extract diagonals from a regular rank bitmap. > >Of course, feel free to add your OWN list of instructions you would like to see >:) LOL > >Larry. The best for me is the general registers 64 bits wide. And some 128, like it was for a very long time promised with the new 64 bits CPU. All MMX instructions I see as very little for really good advance in chess programming. Leonid.
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