[PATCH] D65860: [Attributor] Add LoopInfo to InformationCache and improve willreturn deduction

[Hideto Ueno via Phabricator via llvm-commits]

uenoku created this revision.
uenoku added reviewers: jdoerfert, sstefan1.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

In this patch, LoopInfo is added to InformationCache and used for `willreturn` function attribute deduction.

We can have `willreturn` if we assume all the loops in the function are assumed as `never-endless` (concrete implementation is in D65296 <https://reviews.llvm.org/D65296>. In this patch, only interfaces are provided). If there is an irreducible loop in function, we reach pessimistic fixpoint for now.


https://reviews.llvm.org/D65860

Files:
  llvm/include/llvm/Transforms/IPO/Attributor.h
  llvm/lib/Transforms/IPO/Attributor.cpp
  llvm/test/Transforms/FunctionAttrs/read_write_returned_arguments_scc.ll

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