From: user5857@newsgrouper.org.invalid   
      
   Thomas Koenig  posted:   
      
   > Stephen Fuld  schrieb:   
   >   
   > > Some time ago, we discussed using the 5 bit immediates in floating point   
   > > instructions as an index to an internal ROM with frequently used   
   > > constants.  The idea is that it would save some space in the instruction   
   > > stream.  Are you implementing that, and if not, why not?   
   >   
   > I did some statistics on which floating point constants occurred how   
   > often, looking at three different packages (Perl, gnuplot and GSL).   
   > GSL implements a lot of special founctions, so it has a lot of   
   > constants you are not likely to find often in a random sample of   
   > other packages :-) Perl has very little floating point.  gnuplot   
   > is also special in its own way, of course.   
   >   
   > A few constants occur quite often, but there are a lot of   
   > differences between the floating point constants for different   
   > programs, to nobody's surprise (presumably).   
   >   
   > Here is the head of an output of a little script I wrote to count   
   > all floating-point constants from My66000 assembler.  Note that   
      
   There is a space between the y and the 6 in My 66000.   
      
   > the compiler is for the version that does not yet do 0.5 etc as   
   > floating point.  The first number is the number of occurrences,   
   > the second one is the constant itself.   
   >   
   > 5-bit constants:  886   
   > 32-bit constants: 566   
   > 64-bit constants:597   
   > 303 0   
   > 290 1   
   > 96 0.5   
   > 81 6   
   > 58 -1   
   > 58 1e-14   
   > 49 2   
   > 46 -2   
   > 45 -8.98846567431158e+307   
   > 44 10   
   > 44 255   
   > 37 8.98846567431158e+307   
   > 29 -0.5   
   > 28 3   
   > 27 90   
   > 27 360   
   > 26 -1e-05   
   > 21 0.0174532925199433   
   > 20 0.9   
   > 18 -3   
   > 17 180   
   > 17 0.1   
   > 17 0.01   
   > [...]   
   >   
      
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