[PATCH] D71324: [PowerPC] Exploit `vrl(b|h|w|d)` to perform vector rotation

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
lkail added reviewers: PowerPC, hfinkel, jsji, nemanjai.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.
Herald added a project: LLVM.

Currently, we set legalization action of `ISD::ROTL` vectors as `Expand` in `PPCISelLowering`. However, we can exploit `vrl(b|h|w|d)` to lower `ISD::ROTL` directly.


https://reviews.llvm.org/D71324

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCInstrAltivec.td
  llvm/test/CodeGen/PowerPC/funnel-shift-rot.ll
  llvm/test/CodeGen/PowerPC/vector-rotates.ll

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