CUTOFF
if (ix - iy >= CUTOFF << 20 || isinf(x))
if (iy - ix >= CUTOFF << 20)
if (ix <= (BIAS + DBL_MAX_EXP / 2 - CUTOFF) << 20)
if (ix - iy >= CUTOFF << 23 || isinf(x))
if (iy - ix >= CUTOFF << 23)
if (ix <= (BIAS + FLT_MAX_EXP / 2 - CUTOFF) << 23)
if (ix - iy >= CUTOFF || isinf(x))
if (iy - ix >= CUTOFF)
if (ix <= BIAS + LDBL_MAX_EXP / 2 - CUTOFF)