From: krishna.myneni@ccreweb.org   
      
   On 5/4/24 10:14, NN wrote:   
   > On 30/11/2023 6:55 pm, Krishna Myneni wrote:   
   >> I'm in need of a convenient way to do the following for the fp stack,   
   >> but we can pose the problem for the data stack:   
   >>   
   >>     a b c -- b a c   
   >>   
   >> Two ways to do this on the data stack are   
   >>   
   >>    ROT SWAP   
   >>   
   >>    >R SWAP R>   
   >>   
   >> ( the latter can't be done from the interpreter, portably at least ).   
   >>   
   >> Is there a word I'm not remembering to perform this operation? If not   
   >> what name would one give to this stack operation?   
   >>   
   >> SWAP-UNDER   
   >> ROTSWAP   
   >> RISE   
   >>   
   >> For fp stack manipulation, I had posted mostly portable code for F>R   
   >> and FR> to push and pop from the floating point stack to/from the   
   >> return stack. A significant reason for suggesting the F>R FR> pair is   
   >> to deal with this situation where having to use FROT FSWAP would be   
   >> inefficient on non-analytic compilers.   
   >>   
   >> Maybe a generic swap operation at depth u, called RISE, is useful e.g.   
   >>   
   >>   
   >> 0 RISE   \ same as SWAP   
   >> 1 RISE   \ i*x a b c -- i*x b a c   
   >> 2 RISE   \ i*x a b c d -- i*x b a c d   
   >> etc.   
   >>   
   >>   
   >> Comments?   
   >>   
   >> --   
   >> Krishna Myneni   
   >>   
   >   
   >   
   > Since no one suggested it, in factor they have called it swapd ( x y z   
   > -- y x z )   
   >   
   > https://docs.factorcode.org/content/word-swapd%2Ckernel.html   
   >   
   > Using the same convention you could call it fswapd for operating on the   
   > floating stack.   
      
   Thanks for the suggestion. It's nice to have a word name with some   
   history of use.   
      
   --   
   KM   
      
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