FPSCR_FG
cc = FPSCR_FG;
#define opposite_cc(cc) ((cc) == FPSCR_FL ? FPSCR_FG : FPSCR_FL)
cc = diff(FPSCR_FG);
cc = FPSCR_FG;
#define FPRF_SIGN(sign) ((sign) ? FPSCR_FL : FPSCR_FG)