Hi,

Code snippet 1 and 2 convert an hex to float, but the SNaN is changed to QNaN automatically. It follows IEEE 754 behavior.

While Code snippet 3 converts an hex to double, and  the SNaN keeps.

Is there any solution to keep SNaN float unchanged in Code snippet 1 and 2?

1. >>> i = int('7f800001', 16)

>>> cp = pointer(c_uint32(i))

>>> fp = cast(cp, POINTER(c_float))

>>> print(fp.contents.value) # nan

>>> print(struct.pack(">f", fp.contents.value).hex())

7fc00001

2. >>> f = struct.unpack('!f', bytes.fromhex('7f800001'))[0]

>>> f  # nan

>>> hex(struct.unpack('<I', struct.pack('<f', f))[0])

'0x7fc00001'

3. >>> i = int('7FF0000000000001', 16)

>>> cp = pointer(c_uint64(i))

>>> fp = cast(cp, POINTER(c_double))

>>> print(fp.contents.value)

nan

>>> print(struct.pack(">d", fp.contents.value).hex())

7ff0000000000001

Thank you in advance!