[PATCH] D144229: [RISCV] Select signed and unsigned bitfield extracts for XTHeadBb

[Philipp Tomsich via Phabricator via llvm-commits]

philipp.tomsich created this revision.
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The XTHeadBb extension hab both signed and unsigned bitfield
extraction instructions (TH.EXT and TH.EXTU, respectively) which have
previously only been supported for sign extension on byte, halfword,
and word-boundaries.

This adds the infrastructure to use TH.EXT and TH.EXTU for arbitrary
bitfield extraction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144229

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
  llvm/lib/Target/RISCV/RISCVInstrInfoXTHead.td
  llvm/test/CodeGen/RISCV/bitextract-mac.ll
  llvm/test/CodeGen/RISCV/ctlz-cttz-ctpop.ll
  llvm/test/CodeGen/RISCV/rotl-rotr.ll
  llvm/test/CodeGen/RISCV/rv32xtheadbb.ll
  llvm/test/CodeGen/RISCV/rv64xtheadbb.ll

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