MANT_BITS          60 libavutil/softfloat_ieee754.h     return av_normalize_sf_ieee754((SoftFloat_IEEE754) {sign, n << MANT_BITS, 0 + e});
MANT_BITS          85 libavutil/softfloat_ieee754.h     mant = ((((uint64_t) (a.mant | 0x00800000UL)) << MANT_BITS) / (b.mant| 0x00800000UL));
MANT_BITS          98 libavutil/softfloat_ieee754.h     mant = (((uint64_t)(a.mant|0x00800000UL) * (uint64_t)(b.mant|0x00800000UL))>>MANT_BITS);