Author: Gerd Isenberg
Date: 00:13:29 02/03/04
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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 ;-)
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