works for me, too: In [9]: x = cast_int2float(0x7ff8000000000001) In [10]: hex(cast_float2int(x)) Out[10]: '0x7ff8000000000001' In [11]: x = cast_int2float(0x7ff0000000000001) In [12]: hex(cast_float2int(x)) Out[12]: '0x7ff0000000000001' OS-X, conda build: Python 3.7.0 | packaged by conda-forge | (default, Aug 27 2018, 17:24:52) [Clang 6.1.0 (clang-602.0.53)] on darwin I suspect it depends on the compiler's math library But neither is raising an exception: In [3]: x = cast_int2float(0x7ff0000000000001) In [4]: y = cast_int2float(0x7ff8000000000001) In [5]: 2.0 / x Out[5]: nan In [6]: 2.0 / y Out[6]: nan When should it? -CHB On Fri, Nov 9, 2018 at 3:46 AM, Serhiy Storchaka <storchaka@gmail.com> wrote:
09.11.18 13:05, Steven D'Aprano пише:
py> x = cast_int2float(0x7ff0000000000001) py> x nan py> hex(cast_float2int(x)) '0x7ff8000000000001'
I got '0x7ff0000000000001'.
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