20001127-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* { dg-do compile { target i?86-*-* } } */
/* { dg-options "-O2" } */

extern inline float bar (float x)
{
  register long double value;
  asm volatile ("frndint" : "=t" (value) : "0" (x));
  return value;
}

float a;

float foo (float b)
{
  return a + bar (b);
}