Stefan Krah <[email protected]> added the comment:

I can reproduce your results with a recent clang. gcc has similar
optimization behavior, but for gcc ./configure automatically adds
-fwrapv, which prevents the incorrect results.

I'm closing this as a duplicate of #11149.

----------
resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> [PATCH] Configure should enable -fwrapv for clang

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<http://bugs.python.org/issue12973>
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