Need help on FPU division/Multiplication

[Halesh S <halesh.s@xxxxxxxxx>]

Hi,

I wrote a small code to perform FPU division and multiplication. & I
have attached the same.

The output is as follows

$./test
1.000000
81.000000
1.000000
nan

Why the last o/p is giving NAN? Please let me the answer, why its
failing to return the proper product.
If any problem in my code please let me know.

Thanks,
Halesh

#include <stdio.h>
#include <math.h>

#define NRCONST 24
#define DBL_EPSILION 0.0005
#define MAX_DIFF 0.1
#define MAX_COMPUTE 99999


float  assm_div(float a1, float b1)
{

  float asm_res;

 
 __asm__ ("fld 8(%%ebp)"
         :
         :"a"(a1)
         );

 __asm__ ("fld 12(%%ebp)"
         :
         :"b"(b1)
         );

 __asm__ ("fdiv %st(1), %st");


 __asm__ ("fst -8(%%ebp)"
         :
         :"a"(asm_res)
         );

 return asm_res;

}


float  assm_mul(float a1, float b1)
{

  float asm_res;

 __asm__ ("fld 8(%%ebp)"
          :
          :"a"(a1)
         );

 __asm__ ("fld 12(%%ebp)"
         :
         :"b"(b1)
         );

 __asm__ ("fmul %st(1), %st");


 __asm__ ("fst -8(%%ebp)"
         :
         :"a"(asm_res)
         );

 return asm_res;

}
int main()
{
  float std_resm, asm_res;
  int num, count;

    asm_res = assm_div(9,9);
    printf("%f\n", asm_res);

    asm_res = assm_mul(9,9);
    printf("%f\n", asm_res);

    asm_res = assm_div(9,9);
    printf("%f\n", asm_res);

    asm_res = assm_mul(9,9);
    printf("%f\n", asm_res);
}