[all-commits] [llvm/llvm-project] 184ba0: [RISCV] Avoid matching 3/5/9 * 2^N as 2^N + 2/4/8 ...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 184ba038ac1d444980b3e554b0057f3f30c516ab
      https://github.com/llvm/llvm-project/commit/184ba038ac1d444980b3e554b0057f3f30c516ab
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-04-16 (Tue, 16 Apr 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/addimm-mulimm.ll
    M llvm/test/CodeGen/RISCV/rv64zba.ll

  Log Message:
  -----------
  [RISCV] Avoid matching 3/5/9 * 2^N as 2^N + 2/4/8 (e.g. 24) (#88937)

The former is better as a zero extend can be folded into the sll,
whereas the later currently produces a seperate zext.w due to bad
interactions with other combines.



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