SO 78391454

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

double x87_sin (double x)
{
    double sinval;

    asm ("fsin" : "=t" (sinval) : "0" (x));
    return sinval;
}

int main(void)
{
    double x = 45.0*M_PI/180.0;
    printf ("%f\n", x87_sin(x));
    return 0;
}