Author: Vincent Diepeveen
Date: 08:45:20 02/03/04
Go up one level in this thread
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.
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