Mark Dickinson added the comment:
Here's a patch that fixes the test that Collin mentioned to reflect what's
actually been
happening for the last nearly 5 years, and changes _PyFloat_Pack4 and
_PyFloat_Pack8, as
follows.
When packing a float that's too large for the destination format (e.g.
pack(">f", 1e39)):
- before the patch, _PyFloat_Pack* gives an OverflowError on non-IEEE-754
platforms and
an IEEE infinity on IEEE-754 platforms.
- after the patch, _PyFloat_Pack* gives an IEEE infinity on all platforms.
This patch doesn't fix the problem that the cast from double to float on IEEE
machines
involves potentially undefined behaviour; I think that should be considered a
separate
issue.
Added file: http://bugs.python.org/file9240/705836.patch
____________________________________
Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue705836>
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