0.5   -ULP             0.4999999999999999        4.9999999999999994e-001           0x1.fffffffffffffp-2       +0x1.fffffffffffffp-0002    +0d1.9999999999999998p-0002
0.5                    0.5000000000000000        5.0000000000000000e-001           0x1.0000000000000p-1       +0x1.0000000000000p-0001    +0d1.0000000000000000p-0001
0.5   +ULP             0.5000000000000001        5.0000000000000011e-001           0x1.0000000000001p-1       +0x1.0000000000001p-0001    +0d1.0000000000000002p-0001