If the operand is marked M_OPTIONAL_DEF_OPERAND, then it's a def.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38496 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index a1cb244e6b90025edf0f8ff04fd55ef644f3c31f..2252e7dcd795a4880fc5d6f405bb66d7497dc573 100644 (file)
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -323,7 +323,10 @@ void ScheduleDAG::AddOperand(MachineInstr *MI, SDOperand Op,
     
     // Get/emit the operand.
     unsigned VReg = getVR(Op, VRBaseMap);
-    MI->addRegOperand(VReg, false);
+    const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
+    bool isOptDef = (IIOpNum < TID->numOperands)
+      ? (TID->OpInfo[IIOpNum].Flags & M_OPTIONAL_DEF_OPERAND) : false;
+    MI->addRegOperand(VReg, isOptDef);
     
     // Verify that it is right.
     assert(MRegisterInfo::isVirtualRegister(VReg) && "Not a vreg?");