A couple of places where reused use operands should be marked kill. This is exposed by recent availability fallthrough changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64745 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index f288dcc..e2dc636 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -1599,6 +1599,12 @@
PotentialDeadStoreSlots.push_back(ReuseSlot);
}
+
+ // Assumes this is the last use. IsKill will be unset if reg is reused
+ // unless it's a two-address operand.
+ if (ti == -1)
+ MI.getOperand(i).setIsKill();
+
continue;
} // CanReuse
@@ -1764,6 +1770,11 @@
DefMO = NextMII->findRegisterDefOperand(DestReg);
DefMO->setSubReg(SubIdx);
}
+
+ // Mark is killed.
+ MachineOperand *KillOpnd = NextMII->findRegisterUseOperand(InReg);
+ KillOpnd->setIsKill();
+
BackTracked = true;
} else {
DOUT << "Removing now-noop copy: " << MI;