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Subject: Re: BitScan with reset - not so impressive with 3DNow!

Author: Gian-Carlo Pascutto

Date: 03:40:36 12/03/02

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On December 02, 2002 at 19:43:15, Gerd Isenberg wrote:

>Congrats, Walter!!
>
>10-bit pattern		bsf	PI2FD	btr	c      LSB_64
>0x0000000011111133	15.3	18.0	19.1	22.8    17.8
>0x1010111010101110	19.7	18.5	19.6	23.4    17.8
>0x1111113300000000	20.6	18.0	19.1	22.8    17.8

Does this mean that this is the fastest currently known
FindFirstAndRemove *and* that it doesn't need assembly?

Impressive for sure!

Any similar tricks for lightning-speed popcounting?

What's the fastest sequence you've got for popcounting so
far? (preferably one that doesn't depend too much on new
instructions)

--
GCP

• Re: BitScan with reset - not so impressive with 3DNow! Gerd Isenberg 07:09:31 12/03/02
  • Re: BitScan with reset - not so impressive with 3DNow! Russell Reagan 12:15:27 12/03/02
    • Re: BitScan with reset - not so impressive with 3DNow! Matt Taylor 14:27:07 12/03/02
  • Re: BitScan with reset - not so impressive with 3DNow! Miguel A. Ballicora 10:35:54 12/03/02
    • Re: BitScan with reset - not so impressive with 3DNow! Gerd Isenberg 14:00:45 12/03/02
      • Re: BitScan with reset - not so impressive with 3DNow! Miguel A. Ballicora 09:00:03 12/04/02
      • Oups, null as terminator is not so smart! Gerd Isenberg 15:19:22 12/03/02
• Re: BitScan with reset - not so impressive with 3DNow! Russell Reagan 06:32:16 12/03/02
  • Re: BitScan with reset - not so impressive with 3DNow! Gian-Carlo Pascutto 08:47:54 12/03/02
  • Re: BitScan with reset - not so impressive with 3DNow! Gerd Isenberg 07:50:32 12/03/02
• Re: BitScan with reset - not so impressive with 3DNow! Matt Taylor 06:05:30 12/03/02
• Re: BitScan with reset - not so impressive with 3DNow! Sune Fischer 04:00:37 12/03/02
  • Re: BitScan with reset - not so impressive with 3DNow! Matt Taylor 07:29:50 12/04/02
    • Re: BitScan with reset - not so impressive with 3DNow! Sune Fischer 07:39:34 12/04/02
      • Re: BitScan with reset - not so impressive with 3DNow! Matt Taylor 09:03:07 12/04/02

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