Add an implementation of the CanLowerReturn function to the PPC backend

llvm-svn: 141981
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index cf9f27d..d6b8a9e 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -3416,6 +3416,17 @@
                     Ins, InVals);
 }
 
+bool
+PPCTargetLowering::CanLowerReturn(CallingConv::ID CallConv,
+                                  MachineFunction &MF, bool isVarArg,
+                                  const SmallVectorImpl<ISD::OutputArg> &Outs,
+                                  LLVMContext &Context) const {
+  SmallVector<CCValAssign, 16> RVLocs;
+  CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
+                 RVLocs, Context);
+  return CCInfo.CheckReturn(Outs, RetCC_PPC);
+}
+
 SDValue
 PPCTargetLowering::LowerReturn(SDValue Chain,
                                CallingConv::ID CallConv, bool isVarArg,
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
index 5f825bd..430e45e 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -445,6 +445,12 @@
                 DebugLoc dl, SelectionDAG &DAG,
                 SmallVectorImpl<SDValue> &InVals) const;
 
+    virtual bool
+      CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
+                   bool isVarArg,
+                   const SmallVectorImpl<ISD::OutputArg> &Outs,
+                   LLVMContext &Context) const;
+
     virtual SDValue
       LowerReturn(SDValue Chain,
                   CallingConv::ID CallConv, bool isVarArg,