Author: Dave Gomboc
Date: 07:14:19 09/17/99
Go up one level in this thread
On September 17, 1999 at 10:00:47, Brian Richardson wrote: >On September 16, 1999 at 17:07:08, J. Wesley Cleveland wrote: > >>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. > >I saw the czx instructions, but they find the first zero byte (or 2 bytes). >How would you use czx to find the first non-zero element? >Also, seems like table lookup would still be needed to find the first/last bit >set? xor all of the bits first Dave
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.