From: not_valid@nospicedham.comcast.net   
      
   "Terje Mathisen"  wrote in message news:t6fa22$1lpt$1@gioia.aioe.org...   
      
   > James Van Buskirk wrote:   
   > > Just for fun I thought I would try various strategies for permuting   
   > > an array of single-precision floating point numbers using AVX2.   
   > > bitrev1.asm just does vpunpckl/hdq/qdq or its lane-crossing   
   > > synthesis with vperm2i128 and has a hard limit of 24 clocks to   
   > > bit-reverse a 64-element array because all of these operations   
   > > use pipeline 5.   
   > [snip]   
   > > To make a long story short these tests seemed to show that   
   > > bitrev1 took about 27 clocks, bitrev2 about 23, bitrev3 about   
   > > 93, and bitrev4 about 72 clocks.   
      
   > Interesting stuff, thanks for posting!   
      
   I have an update coming for bitrev2.   
      
   > > Oh well, maybe I should have gone out and played in the snow   
   > > instead today.   
      
   > Snow today, in late May? Are you in some New Zealand southern island   
   > mountains/ditto South America/Antarctica?   
      
   > Or just high up in the Rockies (US/Canada) and the snow is old stuff?   
      
   https://kdvr.com/weather/weather-forecast/near-record-90-degree-   
   eat-thursday-snowstorm-friday/   
      
   I did manage to play in the snow today. It was a little slippery in spots   
   but nice and cool, perfect for hiking.   
      
   https://bouldercolorado.gov/media/2530/download?inline=   
      
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