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Subject: Re: FirstBit() in assembler

Author: Severi Salminen

Date: 08:27:00 01/14/02

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>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...?

Well, you could remove the other jmp and add one "sub eax,32". It would have
less branches but not sure if it was faster. Try it:

bsr eax,bb+4
jnz exit
bsr eax,bb
sub eax,32
exit:
add eax,32

...or something. Your orientation makes my head spin so double check the above.

Severi

• 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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