This is most probably the best variabt so far, and not complicated, such a
optimizer can do "the right thing" easily. sorry for the many versions..
-gustaf


   { unsigned register int s = (size-1) >> 3;
     while (s>1) { s >>= 1; bucket++; }
   }

     if (bucket > NBUCKETS) {
   bucket = NBUCKETS;
     }



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