Mark Dickinson <dicki...@gmail.com> added the comment:

If we're worrying about undefined behaviour, it looks like recent optimizations 
have *introduced* new undefined behaviour in the form of strict aliasing 
violations.  E.g., from ascii_decode:

    unsigned long value = *(const unsigned long *) _p;

(here _p has type const char *).  This should really be fixed;  compilers are 
known to make optimizations based on the assumption that this sort of undefined 
behaviour doesn't occur.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15144>
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