[PATCH] D69168: [PowerPC] Fold redundant load immediates of zero and delete if possible

[Kamau Bridgeman via Phabricator via llvm-commits]

kamaub created this revision.
kamaub added reviewers: lei, nemanjai, stefanp, hfinkel, power-llvm-team, jsji.
Herald added subscribers: llvm-commits, shchenz, MaskRay, kbarton, hiraditya.
Herald added a project: LLVM.

This patch folds redundant load immediates into a zero for instructions
which recognise this as the value zero and not the register. If the load
immediate is no longer in use it is then deleted.

This is already done in earlier passes but the ppc-mi-peephole allows for
a more general implementation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69168

Files:
  llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
  llvm/lib/Target/PowerPC/PPCInstrInfo.h
  llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
  llvm/test/CodeGen/PowerPC/fold-remove-li.ll
  llvm/test/CodeGen/PowerPC/save-crbp-ppc32svr4.ll

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