Improve comment to include that the use of a preg is also verboten in this situation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106119 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp
index 61334fc..e2152d4 100644
--- a/lib/CodeGen/MachineSink.cpp
+++ b/lib/CodeGen/MachineSink.cpp
@@ -282,9 +282,10 @@
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;