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

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

In D74935#1886020 <https://reviews.llvm.org/D74935#1886020>, @nhaehnle wrote:

> I find this phrasing pretty confusing. How about the following:
>
> > This indicates that objects accessed via pointer values based on the argument or return value are not **modified**, during the execution of the function, via pointer values not based on the argument or return value. [...]


This isn't equivalent.  If the memory location is modified, we want to forbid both reads and writes that aren't based on the noalias pointer.


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https://reviews.llvm.org/D74935