Author: Robert Hyatt
Date: 09:15:23 02/03/04
Go up one level in this thread
On February 03, 2004 at 11:45:20, Vincent Diepeveen wrote: >On February 03, 2004 at 03:13:29, Gerd Isenberg wrote: > >>On February 03, 2004 at 01:03:29, Jay Urbanski wrote: >> >>>On February 02, 2004 at 22:41:19, Robert Hyatt wrote: >>> >>>>On February 02, 2004 at 20:06:29, David Rasmussen wrote: >>>> >>>>>Does the Opteron have firstBit, lastBit and popCount instructions? Or at least >>>>>something that makes calculating them easier than on x86-32? >>>>> >>>>>/David >>>> >>>> >>>>Has the same BSF/BSR instructions, but no popcnt that I have found. Note >>>>that BSF/BSR work on 64 bit values if you want. I have inline asm to do >>>>all three for gcc if you are interested. >>> >>>I understand there is a popcount instruction. I also understand it's >>>undocumented. >> >>Do you have any opcode or further hints? >>That would be great - a 4 cycle vector path popcount ;-) > >And deadslow. Certainly not slower than what we have to do at present...
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.