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2017 Jun 15
3
killing undef and spreading poison
Daniel,
Thanks for taking the time to respond.
Regarding GVN and newGVN, I recently finished a search through the
llvm-dev archives for “nsw” in the subject line, and GVN was discussed in
some of those threads [1].
In particular it was claimed that there was a right choice for GVN to make given
two ADD instructions, one with the “nsw” attribute and one without, the one
without ‘nsw’