FLT_MAX_EXP
#define BIAS (FLT_MAX_EXP - 1)
if (ix <= (BIAS + FLT_MAX_EXP / 2 - CUTOFF) << 23)
s < FLT_MAX_EXP - FLT_MANT_DIG;
s += (FLT_MAX_EXP - FLT_MANT_DIG - FLT_MIN_EXP)/5) {