Don't mark registers dead here when processing nodes with MVT::Flag
results. This works around a problem affecting targets which rely on
MVT::Flag to handle physical register defs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85638 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index e727bc9..da311ed 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -573,7 +573,11 @@
unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
if (Node->hasAnyUseOfValue(i))
EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
- else
+ // If there are no uses, mark the register as dead now, so that
+ // MachineLICM/Sink can see that it's dead. Don't do this if the
+ // node has a Flag value, for the benefit of targets still using
+ // Flag for values in physregs.
+ else if (Node->getValueType(Node->getNumValues()-1) != MVT::Flag)
MI->addRegisterDead(Reg, TRI);
}
}