[PATCH] D68626: [Attributor] Use undef for calls with unused arguments.

[Johannes Doerfert via Phabricator via llvm-commits]

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

If an argument is unused, we can pass in undef instead of the original
value to remove the use of the original value completely.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D68626

Files:
  llvm/lib/Transforms/IPO/Attributor.cpp
  llvm/test/Transforms/FunctionAttrs/align.ll
  llvm/test/Transforms/FunctionAttrs/callbacks.ll
  llvm/test/Transforms/FunctionAttrs/internal-noalias.ll
  llvm/test/Transforms/FunctionAttrs/noalias_returned.ll

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