T(RN, 0x0p+0, FP_ILOGB0, INVALID)
T(RN, -0x0p+0, FP_ILOGB0, INVALID)
T(RN, -0x1p-100, -100, 0)
T(RN, 0x1p+0, 0, 0)
T(RN, -0x1p+0, 0, 0)
T(RN, inf, -1U/2, INVALID)
T(RN, -inf, -1U/2, INVALID)
T(RN, nan, FP_ILOGBNAN, INVALID)
T(RN, 0x1p-16445L, -16445, 0)