1T(RN, 0x0p+0, FP_ILOGB0, INVALID)
2T(RN, -0x0p+0, FP_ILOGB0, INVALID)
3T(RN, -0x1p-100, -100, 0)
4T(RN, 0x1p+0, 0, 0)
5T(RN, -0x1p+0, 0, 0)
6T(RN, inf, -1U/2, INVALID)
7T(RN, -inf, -1U/2, INVALID)
8T(RN, nan, FP_ILOGBNAN, INVALID)
9T(RN, 0x1p-149, -149, 0)
10