floating point suddenly not working

hi anyone
   
  i have problem with my program.my floating point culculation was not working since i migrate from CW6.6 to CW8.1.even a simple program like below.iam working with cme555 board.
   
  can anyone help, how was this thing possibly heappens.is there any setting i have to change in the current CW8.1 that iam using?
   
  #include <stdio.h>
  asm void disIEEE(void)
{
  mfmsr r3;
  ori r3,r3,0x2002;      //enable fp
  mtmsr r3;
    mtfsb1 29;     //disable IEEE FP
}
   
   
  void main()
{
 
    
 int i;
 double a;
 double b;
 double c;
   
  disIEEE();
  
 i=0;
 a=0.0;
 b=2.5;
 c=2;
   a=b/c;
 
 
 
 while (1) { i++; } // loop forever
}
   

			
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