Author: Jay Urbanski
Date: 22:03:29 02/02/04
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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.
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