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Subject: Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n)

Author: J. Wesley Cleveland

Date: 14:07:08 09/16/99

Go up one level in this thread

On September 15, 1999 at 16:57:30, Brian Richardson wrote:

>I have looked at Intel's IA64 architecture guide and can't find these
>instructions, although there is a popcnt.  Am I missing something?

There is a Compute Zero Index, which would allow you to do it in 3 instructions.

• Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) Brian Richardson 07:00:47 09/17/99
  • Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) Dave Gomboc 07:14:19 09/17/99
    • Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) Dave Gomboc 00:04:30 09/20/99
    • Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) Brian Richardson 12:56:37 09/17/99
      • Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) J. Wesley Cleveland 15:24:28 09/20/99
    • Re: IA-64 (Merced) missing bsf & bsr (re: Best way to extract n from 2^n) J. Wesley Cleveland 12:09:18 09/17/99

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