Extended Instruction Set

Comments

1. 

   ken.gus@telia.com

   Pascal compiler for PIC32. Are trying to use pi with extended format, but it comes out as a 24bit value.

   program exper;
   var pie : extended;
       uta, utb, utc : array[23] of char;
   begin
     pie := pi;
     ExtendedToStr(pie, uta); {3.141592741012573    this is a 24 bit value}
     pie :=                                    3.1415926535897932384626433832795; {good value}
     ExtendedToStr(pie, utb); {3.141592741012573    still a 24 bit value}
     pie := pie                           - 0.00000008742278;    {difference from good value}
     pie := pie                           - 0.0000000000000035;  {needed to get lsb to 0x18 }
     ExtendedToStr(pie, utc); {3.141592653589793    }
   end.  { Main program }

   Is seems that constants are trunkated to 24bit real before they are put into code.

   Kenneth43