tmp = *envp | (0x1f << 23);
tmp = *envp & ~(0x1f << 23);
feholdexcept (fenv_t *envp){  fenv_t tmp;  __fenv_stfsr (*envp);  /* Set all exceptions to non-stop.  */  tmp = *envp | (0x1f << 23);  __fenv_ldfsr (tmp);  return 1;}