[issue9530] integer undefined behaviors

[John Regehr]

John Regehr <regehr at cs.utah.edu> added the comment:

This is great.  I'd be happy to re-run the tests sometime, and also we're talking with the LLVM folks about getting our patches into the main LLMM tree.  Basically it'll act as a more powerful -ftrapv, and the error message will be much better than "aborted".

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<http://bugs.python.org/issue9530>
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