Huang Yang added the comment:
OK. Seems it's the default behavior of CPU instruction. And CPU follows the
IEEE standard of float.
Is there any workaround?
--
status: pending -> open
___
Python tracker
<https://bugs.python.org
Huang Yang added the comment:
Also reproducible by:
from ctypes import *
i = int('7f94e57c', 16)
cp = pointer(c_int(i))
fp = cast(cp, POINTER(c_float))
print(fp.contents.value) # nan
p = pointer(c_float(fp.contents.value))
ip = cast(p, POINTER(c_int))
print(hex(ip.cont
Huang Yang added the comment:
It's reproducible only if the float is nan, with prefix 7f or ff.
Seems the value is OR operated by 0x0040.
--
___
Python tracker
<https://bugs.python.org/is
New submission from Huang Yang :
from ctypes import *
import struct
i = int('7f94e57c', 16)
cp = pointer(c_int(i))
fp = cast(cp, POINTER(c_float))
print(fp.contents.value) # nan
print(struct.pack(">f", fp.contents.value).hex()) # 7fd4e57c
# value change
