[PATCH] D129863: [PowerPC] Improve LowerVECTOR_SHUFFLE load-and-splat multi-use

[Ting Wang via Phabricator via llvm-commits]

tingwang created this revision.
tingwang added reviewers: nemanjai, shchenz, lkail, qiucf, Esme, PowerPC.
tingwang added a project: LLVM.
Herald added subscribers: kbarton, hiraditya.
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tingwang requested review of this revision.
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Currently load-and-splat is applied when input-load has one-use. I think in multi-use scenario, if all use of the load can be shown to touch only the splat region, then we can still use load-and-splat instead of the original load.

This patch tries to explore this opportunity and reduce/simplify instruction.

Baseline test case will be added in https://reviews.llvm.org/D129861.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129863

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/load-and-splat.ll

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