asm3.c

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

// Build don't link:
// Skip if not target: i?86-*-* x86_64-*-*
// Special g++ Options: -O2

typedef unsigned long long uint64;
uint64 fstps(void)
{
  uint64 ret;
  asm volatile("fstps %0" : "=m" (ret));
  return ret;
}