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| author | Piyou Chen <piyou.chen@sifive.com> | 2024-08-28 08:32:54 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-08-28 08:32:54 +0800 |
| commit | 2def1c445826be77a11926b89f901c0cd6d571d7 (patch) | |
| tree | e43a2fc3ddeacb5d4d225c209b961193e09f402c /llvm/lib/CodeGen/MachineCopyPropagation.cpp | |
| parent | 32abe5d49b758edef0f0c19090361a6fe85c4092 (diff) | |
| download | llvm-2def1c445826be77a11926b89f901c0cd6d571d7.zip llvm-2def1c445826be77a11926b89f901c0cd6d571d7.tar.gz llvm-2def1c445826be77a11926b89f901c0cd6d571d7.tar.bz2 | |
[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
Diffstat (limited to 'llvm/lib/CodeGen/MachineCopyPropagation.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCopyPropagation.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp index b34e093..fab36f4 100644 --- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp +++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp @@ -1053,7 +1053,7 @@ void MachineCopyPropagation::BackwardCopyPropagateBlock( // Ignore non-trivial COPYs. std::optional<DestSourcePair> CopyOperands = isCopyInstr(MI, *TII, UseCopyInstr); - if (CopyOperands && MI.getNumOperands() == 2) { + if (CopyOperands) { Register DefReg = CopyOperands->Destination->getReg(); Register SrcReg = CopyOperands->Source->getReg(); |