[PATCH] D90302: [llvm-reduce] Add reduction for special globals like llvm.used.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: lebedev.ri, dblaikie, arsenm.
Herald added a subscriber: mgorny.
Herald added a project: LLVM.
fhahn requested review of this revision.
Herald added a subscriber: wdng.

This patch adds a reduction of 'special' globals that lead to further
reductions (e.g. alias or regular globals reduction) being less efficient
because there are special constraints on values referenced in those
special globals. For example, values in @llvm.used and
@llvm.compiler.used need to be named, so replacing all uses of an
alias/global with undef or a different unnamed constant results in
invalid IR.

More details:
https://llvm.org/docs/LangRef.html#intrinsic-global-variables


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D90302

Files:
  llvm/test/Reduce/remove-alias.ll
  llvm/tools/llvm-reduce/CMakeLists.txt
  llvm/tools/llvm-reduce/DeltaManager.h
  llvm/tools/llvm-reduce/deltas/ReduceSpecialGlobals.cpp
  llvm/tools/llvm-reduce/deltas/ReduceSpecialGlobals.h

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