[PATCH] D87972: [OldPM] Pass manager: run SROA after (simple) loop unrolling

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: fhahn, rampitec, arsenm, MaskRay.
lebedev.ri added a project: LLVM.
Herald added subscribers: nikic, kerbowa, zzheng, hiraditya, nhaehnle, jvesely.
lebedev.ri requested review of this revision.
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I have stumbled into this pretty accidentally, when rewriting some spaghetti-like code
into something more structured, which involved using some `std::arrays`.
And to my surprise, the `alloca`s remained, causing about `+160%` perf regression.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87972

Files:
  llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
  llvm/test/Other/opt-O2-pipeline.ll
  llvm/test/Other/opt-O3-pipeline-enable-matrix.ll
  llvm/test/Other/opt-O3-pipeline.ll
  llvm/test/Other/opt-Os-pipeline.ll
  llvm/test/Transforms/PhaseOrdering/X86/SROA-after-loop-unrolling.ll

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