[PATCH] D103743: [RISCV] Optimize bitwise and with constant for the Zbs extension

[Ben Shi via Phabricator via llvm-commits]

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This patch optimizes (and r i) to
(BCLRI (BCLRI r, i0), i1) in which i = ~((1<<i0) | (1<<i1)).
or
(BCLRI (ANDI r, i0), i1)  in which i = i0 & ~(1<<i1).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103743

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td
  llvm/test/CodeGen/RISCV/rv32zbs.ll
  llvm/test/CodeGen/RISCV/rv64zbs.ll

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