[PATCH] D120800: [MachineSink] Disable if there are any irreducible cycles

[Nikita Popov via Phabricator via llvm-commits]

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This is an alternative to D120330 <https://reviews.llvm.org/D120330>, which disables MachineSink for functions with irreducible cycles entirely. This avoids both the correctness problem, and ensures we don't perform non-profitable sinks into cycles. At the same time, it may also disable profitable sinks in the same function.


https://reviews.llvm.org/D120800

Files:
  llvm/lib/CodeGen/MachineSink.cpp
  llvm/test/CodeGen/X86/callbr-asm-branch-folding.ll
  llvm/test/CodeGen/X86/pr38795.ll
  llvm/test/CodeGen/X86/pr53990-incorrect-machine-sink.ll
  llvm/test/CodeGen/X86/x86-shrink-wrapping.ll

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