[PATCH] D74935: [LangRef][AliasAnalysis] Clarify `noalias` affects only modified objects

[Juneyoung Lee via Phabricator via cfe-commits]

aqjune added a comment.

I agree readnone functions can read constant memory; at least LangRef doesn't restrict readnone functions from accessing memory (unless it changes a state visible to caller). I see that readnone is also attached to a function that loads from/stores to alloca: https://godbolt.org/z/RMAbWa


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