[all-commits] [llvm/llvm-project] 71a977: [RISCV] Add shift-add (SH1ADD, ...) to isCopyInstr...

[Alex Bradbury via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 71a977d0d611f3e9f6137a6b8a26b730b2886ce9
      https://github.com/llvm/llvm-project/commit/71a977d0d611f3e9f6137a6b8a26b730b2886ce9
  Author: Alex Bradbury <asb at igalia.com>
  Date:   2025-03-28 (Fri, 28 Mar 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
    M llvm/unittests/Target/RISCV/RISCVInstrInfoTest.cpp

  Log Message:
  -----------
  [RISCV] Add shift-add (SH1ADD, ...) to isCopyInstrImpl (#133443)

As with #132002, these do show up in a compilation of llvm-test-suite
(including SPEC 2017). We remove 30-40 static instances so this isn't
anything earth shattering.

rs2 is always added to the other shifted (and potentially extended)
operand unmodified, so rs1==zero is equivalent to a copy.



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