Author: Ricardo Gibert
Date: 17:38:27 08/09/03
Go up one level in this thread
On August 09, 2003 at 16:12:28, Gerd Isenberg wrote: >On August 08, 2003 at 15:53:00, Eugene Nalimov wrote: > >>On August 07, 2003 at 15:40:33, Gerd Isenberg wrote: >> >>>... >>>3. bsf, still vector path and 9 cycles. >> >>Hmm, on Itanium2 I can do BSF/BSR equivalent in 8/9 clocks without BSF/BSR >>instructions: > >Hi Eugene, > >I see, Itanium2 has popcount, thanks for the lession. >I refered to opteron's bsf, but anyway, nice lession how to use intrinsics. >My bitscan collection grows and grows ;-) The word lession is not a word. It is most like the word lesion with one "s": http://dictionary.reference.com/search?q=lesion which make what you wrote pretty funny :) I assume this is what you really mean: http://dictionary.reference.com/search?q=lesson > >I'm interested in performance of opterons bsf/btr instructions versus >Matt Taylor's approach with 64-bit magic de Bruijn multiplication, may be even >without lookup: > [snip]
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