[PATCH] D70771: [NFC][PowerPC] Replace the PPCISD:: SExtVElems with ISD::SIGN_EXTEND_INREG to leverage the combine rules

[qshanz via Phabricator via llvm-commits]

steven.zhang created this revision.
steven.zhang added reviewers: nemanjai, jsji, hfinkel, PowerPC.
Herald added subscribers: shchenz, wuzish, kbarton, hiraditya.
Herald added a project: LLVM.
steven.zhang added a parent revision: D70230: [DAGCombine] Don't check the legality of type when combine the SIGN_EXTEND_INREG.

The PPCISD::SExtVElems was added by commit https://reviews.llvm.org/D34009 However, we have another ISD node ISD::SIGN_EXTEND_INREG  that perfectly match the semantics of SExtVElems. And the DAGCombiner has some combine rules for SIGN_EXTEND_INREG that produce better code.


https://reviews.llvm.org/D70771

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/lib/Target/PowerPC/PPCInstrInfo.td
  llvm/lib/Target/PowerPC/PPCInstrVSX.td

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