[PATCH] D109648: [BuildLibCalls] Add globalmemonly to math libcalls that only modify errno

[Mugilan Ganesan via Phabricator via llvm-commits]

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Certain math libcalls, such as acos and exp, only modify the global variable errno. This automatically adds the globalmemonly attribute to those calls. One use case is in removing unnecessary loads of the call arguments, since the calls will have no side-effects on them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109648

Files:
  llvm/lib/Transforms/Utils/BuildLibCalls.cpp

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