Stefan Krah added the comment:

FWIW, on x86/x64 gcc often generates identical code for x = y and
memcpy(x, y, 8). See e.g. the PACK_SINGLE and UNPACK_SINGLE macros in
Objects/memoryobject.c.

I didn't look at the patch yet, just an idea.

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<http://bugs.python.org/issue16427>
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