Measuring 8087 FPU

fpu.c

/*
 * gcc -O0 -m16 -march=i386 -c fpu.c
 *
 * 34:	67 dd 80 00 00       	fldl   0x0(%bx,%si)
 * 3b:	de c9                	fmulp  %st,%st(1)
 * 3d:	67 db 44 24          	fildl  0x24(%si)
 * 43:	db 04 24             	fildl  (%esp)
 * 46:	67 dd 80 08 00       	fldl   0x8(%bx,%si)
 * 4d:	de c9                	fmulp  %st,%st(1)
 * 4f:	de c1                	faddp  %st,%st(1)
 * 51:	de f9                	fdivrp %st,%st(1)
 * 53:	67 dd 5c 24          	fstpl  0x24(%si)
 *
 * gcc -m16 -march=i386 -mno-80387 -c fpu.c
 *
 */
void main ()
{
	volatile double a;
	int i, j;

	for(j=0; j<=5; j++)
		for(i=0; i<=10000; i++)
		{
			a = (i * (double)123)/(j + i * (double)45);
		}
}