core changes for varargs

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22254 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 13 deletions

diff --git a/lib/Target/PowerPC/PPC64ISelPattern.cpp b/lib/Target/PowerPC/PPC64ISelPattern.cpp
index 1d528a9a5b..20fd724444 100644
--- a/lib/Target/PowerPC/PPC64ISelPattern.cpp
+++ b/lib/Target/PowerPC/PPC64ISelPattern.cpp
@@ -98,12 +98,16 @@ namespace {
                 SelectionDAG &DAG);
 
     virtual std::pair<SDOperand, SDOperand>
-    LowerVAStart(SDOperand Chain, SelectionDAG &DAG);
+    LowerVAStart(SDOperand Chain, SelectionDAG &DAG, SDOperand Dest);
 
     virtual std::pair<SDOperand,SDOperand>
-    LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
+    LowerVAArgNext(SDOperand Chain, SDOperand VAList,
                    const Type *ArgTy, SelectionDAG &DAG);
 
+    virtual std::pair<SDOperand,SDOperand>
+    LowerVACopy(SDOperand Chain, SDOperand Src, SDOperand Dest,
+                SelectionDAG &DAG);
+
     virtual std::pair<SDOperand, SDOperand>
     LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
                             SelectionDAG &DAG);
@@ -365,26 +369,36 @@ PPC64TargetLowering::LowerCallTo(SDOperand Chain,
 }
 
 std::pair<SDOperand, SDOperand>
-PPC64TargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG) {
-  //vastart just returns the address of the VarArgsFrameIndex slot.
-  return std::make_pair(DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64), Chain);
+PPC64TargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG, SDOperand Dest) {
+  // vastart just stores the address of the VarArgsFrameIndex slot.
+  SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
+  SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Chain, FR, Dest, DAG.getSrcValue(NULL));
+  return std::make_pair(Result, Result);
 }
 
 std::pair<SDOperand,SDOperand> PPC64TargetLowering::
-LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
+LowerVAArgNext(SDOperand Chain, SDOperand VAList,
                const Type *ArgTy, SelectionDAG &DAG) {
   MVT::ValueType ArgVT = getValueType(ArgTy);
   SDOperand Result;
-  if (!isVANext) {
-    Result = DAG.getLoad(ArgVT, DAG.getEntryNode(), VAList,
-                         DAG.getSrcValue(NULL));
-  } else {
-    Result = DAG.getNode(ISD::ADD, VAList.getValueType(), VAList,
-                         DAG.getConstant(8, VAList.getValueType()));
-  }
+  SDOperand Val = DAG.getLoad(MVT::i64, Chain, VAList, DAG.getSrcValue(NULL));
+  Result = DAG.getLoad(ArgVT, Val.getValue(1), Val, DAG.getSrcValue(NULL));
+  Val = DAG.getNode(ISD::ADD, VAList.getValueType(), Val,
+                    DAG.getConstant(8, VAList.getValueType()));
+  Chain = DAG.getNode(ISD::STORE, MVT::Other, Chain,
+                      Val, VAList, DAG.getSrcValue(NULL));
   return std::make_pair(Result, Chain);
 }
 
+std::pair<SDOperand,SDOperand>
+PPC64TargetLowering::LowerVACopy(SDOperand Chain, SDOperand Src, 
+                                 SDOperand Dest, SelectionDAG &DAG)
+{
+  SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Chain,
+                                 Src, Dest, DAG.getSrcValue(NULL));
+  return std::make_pair(Result, Result);
+}
+
 
 std::pair<SDOperand, SDOperand> PPC64TargetLowering::
 LowerFrameReturnAddress(bool isFrameAddress, SDOperand Chain, unsigned Depth,