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> On Jun 10, 2015, at 11:44 PM, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > >> Base is treated as unsigned so 0xff…ff + 1 would be 0x100…00 > > This is the part I was missing, thanks for pointing out the FAQ. So > the infinitely precise address computed by a GEP is > > zext(Base) + sext(Idx0) + sext(Idx1) … ? Yes, that is the way I read it.

...es, the behavior is undefined. So this works as expected without a potential overflow: for (char *p = array; p < array + sizeof(array); ++p) … Adam -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150611/948f846a/attachment.html>