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Subject: Re: FirstBit() in assembler

Author: Koundinya Veluri

Date: 19:13:32 01/13/02

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On January 13, 2002 at 16:32:01, David Rasmussen wrote:

>On January 13, 2002 at 13:20:52, Dan Newman wrote:
>
>>On January 13, 2002 at 08:48:13, David Rasmussen wrote:
>>
>>
>>I do something like this (Dann Corbit's trick):
>>
>>        bsf eax dword ptr bitboard+4
>>        add eax 32
>>        bsf eax dword ptr bitboard
>>
>
>I get it now... Is there a similar trick for a "LastBit()" function?

I'm using this for LastBit() for a8 = 0, b8 = 1, h1 = 63 orientation:

	bsr		eax, [bb + 4]
	jz		L10
	add		eax, 32
	jmp		L11
L10:
	bsr		eax, [bb]
L11:

This should work, but I'm relatively new to assembly and I wonder if this can
get any better...?

Regards,
Koundinya

>
>/David

• Re: FirstBit() in assembler Severi Salminen 08:27:00 01/14/02
  • Re: FirstBit() in assembler Koundinya Veluri 03:26:10 01/15/02
    • Re: oops here's a better version... Koundinya Veluri 03:54:38 01/15/02
      • Re: oops here's a better version... Miguel A. Ballicora 08:48:09 01/15/02
        • Re: oops here's a better version... Sune Fischer 02:10:23 01/16/02
        • Re: oops here's a better version... Koundinya Veluri 22:00:26 01/15/02
      • Re: oops here's a better version... Severi Salminen 05:41:55 01/15/02
        • Re: oops here's a better version... Koundinya Veluri 22:11:40 01/15/02
          • Re: oops here's a better version... Dann Corbit 21:04:10 01/21/02
            • Re: oops here's a better version... (OT) :-)) David Dory 02:52:54 01/23/02
  • Re: FirstBit() in assembler David Rasmussen 12:46:05 01/14/02

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