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Subject: Re: FirstBit() in assembler - the fastest LastBit()

Author: Severi Salminen

Date: 05:49:16 01/15/02

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>I think something like this should work:
>
>        bsr eax dword ptr bitboard
>        sub eax 32
>        bsr eax dword ptr bitboard+4
>        add eax 32
>
>which makes using last-bit a bit more expensive, but it's still
>straight line code...

And if you know that there is only one 1-bit, you can use the next:

bsr eax,dword ptr b+4
add eax,32
bsr eax,dword ptr b

But then again, why not use the allready equally fast FirstBit()...

Severi

• Re: FirstBit() in assembler - the fastest LastBit() David Rasmussen 06:00:37 01/15/02
  • Re: FirstBit() in assembler - the fastest LastBit() Severi Salminen 11:52:07 01/15/02

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