[all-commits] [llvm/llvm-project] 2dd52f: [RISCV] Fold (srl (and X, 0xffff), C)->(srli (slli...

Craig Topper via All-commits all-commits at lists.llvm.org
Sun Jan 9 18:44:19 PST 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2dd52f840b9b9b66e06c32f706d6b31134435efe
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-01-09 (Sun, 09 Jan 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/test/CodeGen/RISCV/div-by-constant.ll
    M llvm/test/CodeGen/RISCV/rv32zbb-zbp.ll
    M llvm/test/CodeGen/RISCV/rv64zbb-zbp.ll

  Log Message:
  [RISCV] Fold (srl (and X, 0xffff), C)->(srli (slli X, (XLen-16), (XLen-16) + C) even with Zbb/Zbp.

We can use zext.h with Zbb, but srli/slli may offer more opportunities
for compression.

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