diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineCopyPropagation.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCopyPropagation.cpp | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp index 92d043df26b..8662a30a084 100644 --- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp +++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp @@ -280,14 +280,6 @@ void MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) { MaybeDeadCopies.remove(CI->second); } } - // Treat undef use like defs for copy propagation but not for - // dead copy. We would need to do a liveness check to be sure the copy - // is dead for undef uses. - // The backends are allowed to do whatever they want with undef value - // and we cannot be sure this register will not be rewritten to break - // some false dependencies for the hardware for instance. - if (MO.isUndef()) - Defs.push_back(Reg); } // The instruction has a register mask operand which means that it clobbers |
