gcc optimizer problem

[Jeffrey A Law]

  In message < 9804071752.AA17967@moene.indiv.nluug.nl >you write:
  > Could you try this routine compiled with the additional flag  
  > -ffloat-store ?  I bet the "adding this print solves the problem" is  
  > a dead give-away that FRAC normally is kept in a register, which  
  > gives it a slightly different value from when it has to be stored  
  > (which is the case around the calls resulting from the print  
  > statement).
That is the classic symptom of registers having more precision
than memory.

jeff