Exp10 function in spin

Comments

• MagIO2 Posts: 2,243

  2009-07-01 12:56 edited 2009-07-01 12:56

  If you don't use FloatMath, is the result you need a float? Do you expect negative exponents?
• Paul M Posts: 95

  2009-07-01 13:11 edited 2009-07-01 13:11

  Sorry, my error - I am using FloatMath but it does not have an EXP10 function. Float32, Float32A etc have the function but are written in assembler and need a cog to run.
• MagIO2 Posts: 2,243

  2009-07-01 13:22 edited 2009-07-01 13:22

  var
  
  ten_exp long 10.0 & %0111111110000000000000000000000
  ten_mant long 10.0 & %0000000001111111111111111111111
  
  pub exp10( exp )
  return (ten_exp+%0111111110000000000000000000000 & (exp<<22)) & %0111111110000000000000000000000 + ten_mant
  
  quick and dirty because it does not check for overflow. So, as long as you don't deal with to big exponents.
  
  *Note: this is theory ... let's see if it works in practice ;o) *