[PATCH] D102467: [RISCV] Implement codegen patterns for add8, add16, sub8 and sub16

[Jim Lin via Phabricator via llvm-commits]

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Add codegen patterns for add8, add16, sub8 and sub16


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102467

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfoP.td
  llvm/test/CodeGen/RISCV/rvp/alu-rv32.ll
  llvm/test/CodeGen/RISCV/rvp/alu-rv64.ll

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