diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineCopyPropagation.cpp')
| -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 1a39afe..4bcb4d5 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; |