[PATCH] D140683: [PowerPC] enable Policy.ShouldTrackLaneMasks

[Ting Wang via Phabricator via llvm-commits]

tingwang created this revision.
tingwang added reviewers: shchenz, nemanjai, PowerPC.
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This depends on D108902 <https://reviews.llvm.org/D108902>.

Once we started track subreg liveness, we shall enable this policy to model subregister usage better particularly for vector-pair registers. Unfortunately vector-pair is disabled on P10 <https://reviews.llvm.org/P10> right now, so I'm not able to show the real motivation case here.

This change did not observe performance change through test suite.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140683

Files:
  llvm/lib/Target/PowerPC/PPCSubtarget.cpp
  llvm/test/CodeGen/PowerPC/mma-intrinsics.ll
  llvm/test/CodeGen/PowerPC/mma-outer-product.ll
  llvm/test/CodeGen/PowerPC/mmaplus-acc-spill.ll
  llvm/test/CodeGen/PowerPC/ppc64-acc-regalloc.ll

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