[PATCH] D159073: [PowerPC][Peephole] Combine rldicl/rldicr and andi after isel.

[Esme Yi via Phabricator via llvm-commits]

Esme created this revision.
Esme added reviewers: shchenz, lkail, qiucf, tingwang, PowerPC.
Herald added subscribers: kbarton, hiraditya, nemanjai.
Herald added a project: All.
Esme requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

rldicl/rldicr can be eliminated if it's used to clear the high-order or low-order n bits and all bits cleared will be ANDed with 0 by andi.
This patch optimizes such pattern.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159073

Files:
  llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
  llvm/test/CodeGen/PowerPC/p8-scalar_vector_conversions.ll

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