_64e16 - Illumos

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#define _64e63 (_64e15 * _64e16 * _64e16 * _64e16)

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#define _64e64 (_64e16 * _64e16 * _64e16 * _64e16)

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while( r < 0.5/_64e16 && exp > -1009 ){ r *= _64e16; exp -= 16; }

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while( r >= 0.5*_64e15 && exp < 1008 ){ r *= 1.0/_64e16; exp += 16; }