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| author | Alexander Timofeev <Alexander.Timofeev@amd.com> | 2017-11-10 12:21:10 +0000 |
|---|---|---|
| committer | Alexander Timofeev <Alexander.Timofeev@amd.com> | 2017-11-10 12:21:10 +0000 |
| commit | 28da06778fb1f91f6fe854d034d75cc44a817d94 (patch) | |
| tree | 259c74f17f0b8b91f94bbf6b6c26208268342b38 /llvm/lib/CodeGen | |
| parent | 13cc995c3d7ce55326f255718ee1f09fb4ca8bbb (diff) | |
| download | bcm5719-llvm-28da06778fb1f91f6fe854d034d75cc44a817d94.tar.gz bcm5719-llvm-28da06778fb1f91f6fe854d034d75cc44a817d94.zip | |
[AMDGPU] Prevent Machine Copy Propagation from replacing live copy with the dead one
Differential revision: https://reviews.llvm.org/D38754
llvm-svn: 317884
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCopyPropagation.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp index 1a39afe655e..4bcb4d5b98a 100644 --- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp +++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp @@ -187,6 +187,8 @@ bool MachineCopyPropagation::eraseIfRedundant(MachineInstr &Copy, unsigned Src, // Check that the existing copy uses the correct sub registers. MachineInstr &PrevCopy = *CI->second; + if (PrevCopy.getOperand(0).isDead()) + return false; if (!isNopCopy(PrevCopy, Src, Def, TRI)) return false; |
