From: terje.mathisen@tmsw.no   
      
   MitchAlsup wrote:   
   >    
   > MitchAlsup  posted:   
   > -------------------   
   >>   
   >> My Transcendentals get to 1ULP when the multiplier tree is 59×59-bits   
   >> {a bit more than ½ of the get 1ULP at 58×58}. I gave a lot of though   
   >> to this {~1 year} before deciding that a "Do everything else" function   
   >> unit was "overall" better than a couple of "near miss" FUs. So, IMUL   
   >> comes in at 4 cycles, FMUL at 4 cycles, FDIV at 17, SQRT at 22, and   
   >> IDIV at 25. The fast IMUL makes up a lot for the "size" of the FU.   
   >    
   > I forgot to add that my transcendentals went from    
   > faithfully rounded 0.75ULP RMS to 5.002ULP RMS when the tree was   
   > expanded.   
      
   You obviously intended 0.5002 ulp, so you have about 11-13 guard bits to   
   get the rounding correct?   
      
   Terje   
      
   --    
   -    
   "almost all programming can be viewed as an exercise in caching"   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)