diff options
| -rw-r--r-- | lib/CodeGen/MachineSink.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp index 61334fc179..e2152d43a8 100644 --- a/lib/CodeGen/MachineSink.cpp +++ b/lib/CodeGen/MachineSink.cpp @@ -282,9 +282,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) { if (MI->getParent() == SuccToSinkTo) return false; - // If the instruction to move defines a dead physical register which is live - // when leaving the basic block, don't move it because it could turn into a - // "zombie" define of that preg. E.g., EFLAGS. (<rdar://problem/8030636>) + // If the instruction to move defines or uses a dead physical register which + // is live when leaving the basic block, don't move it because it could turn + // into a zombie define or misuse of that preg. E.g., EFLAGS. + // (<rdar://problem/8030636>) for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) { const MachineOperand &MO = MI->getOperand(I); if (!MO.isReg()) continue; |