FPSCR_FX
ud.u_fpscr |= FPSCR_FX;
ud.u_fpscr &= ~FPSCR_FX;
ud.u_fpscr |= FPSCR_FX;
ud.u_fpscr &= ~FPSCR_FX;
fpscr |= FPSCR_FX;
fpscr &= ~FPSCR_FX;
FPSCR_FX | FPSCR_OX | \
fsr |= FPSCR_FX;