[issue8847] crash appending list and namedtuple

[Stefan Krah]

Stefan Krah added the comment:

Martin v. L??wis <report at bugs.python.org> wrote:
> > If not, then I doubt PGO is buying us anything anyway.
> 
> It was originally added because people reported measurable speedups when
> profile-guided optimization is used, for VS 2008.

For libmpdec/64-bit I've measured huge speedups in the order of 50% (with
training data).  This led me to believe that the main optimizations for
x64 are only available with PGO, perhaps as a distinguishing feature from
the Express versions.

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<http://bugs.python.org/issue8847>
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