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...bit pattern. So, a short version would be that poison is like undef, except you get to include the overflow bits of the computation in your undef value. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150129/7d650184/attachment.html>

On 01/28/2015 07:02 AM, Sean Silva wrote: > Could you maybe provide an example where replacing `%always_poison` > with `undef` will change the meaning? At least for me, the thing that > I'm most unclear about is how poison differs from undef. I will second this request for much the same reason. > > -- Sean Silva > > On Wed, Jan 28, 2015 at 2:50 AM, David Majnemer >