[all-commits] [llvm/llvm-project] 2def1c: [RISCV][MCP] Remove redundant move from tail dupli...

[Piyou Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2def1c445826be77a11926b89f901c0cd6d571d7
      https://github.com/llvm/llvm-project/commit/2def1c445826be77a11926b89f901c0cd6d571d7
  Author: Piyou Chen <piyou.chen at sifive.com>
  Date:   2024-08-28 (Wed, 28 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/MachineCopyPropagation.cpp
    A llvm/test/CodeGen/RISCV/redundant-copy-from-tail-duplicate.ll

  Log Message:
  -----------
  [RISCV][MCP] Remove redundant move from tail duplication  (#89865)

Tail duplication will generate the redundant move before return. It is
because the MachineCopyPropogation can't recognize COPY after post-RA
pseudoExpand.

This patch make MachineCopyPropogation recognize `%0 = ADDI %1, 0` as
COPY



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