Add NumFixedArgs attribute to CallSDNode which indicates the number of fixed arguments in a vararg call.

With the SVR4 ABI on PowerPC, vector arguments for vararg calls are passed differently depending on whether they are a fixed or a variable argument. Variable vector arguments always go into memory, fixed vector arguments are put 
into vector registers. If there are no free vector registers available, fixed vector arguments are put on the stack.

The NumFixedArgs attribute allows to decide for an argument in a vararg call whether it belongs to the fixed or variable portion of the parameter list.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74764 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 14 insertions, 13 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index ef365e66e6..1413d9552d 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1900,7 +1900,7 @@ SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node,
   const Type *RetTy = Node->getValueType(0).getTypeForMVT();
   std::pair<SDValue, SDValue> CallInfo =
     TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
-                    CallingConv::C, false, Callee, Args, DAG,
+                    0, CallingConv::C, false, Callee, Args, DAG,
                     Node->getDebugLoc());
 
   // Legalize the call sequence, starting with the chain.  This will advance
@@ -2305,7 +2305,7 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node,
     TargetLowering::ArgListTy Args;
     std::pair<SDValue, SDValue> CallResult =
       TLI.LowerCallTo(Node->getOperand(0), Type::VoidTy,
-                      false, false, false, false, CallingConv::C, false,
+                      false, false, false, false, 0, CallingConv::C, false,
                       DAG.getExternalSymbol("abort", TLI.getPointerTy()),
                       Args, DAG, dl);
     Results.push_back(CallResult.second);
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
index 00d71e1a4f..3135a44543 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
@@ -1006,7 +1006,7 @@ SDValue DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, MVT RetVT,
   const Type *RetTy = RetVT.getTypeForMVT();
   std::pair<SDValue,SDValue> CallInfo =
     TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
-                    false, CallingConv::C, false, Callee, Args, DAG, dl);
+                    false, 0, CallingConv::C, false, Callee, Args, DAG, dl);
   return CallInfo.first;
 }
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 0342f67246..c8f4b520ff 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3375,7 +3375,7 @@ SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME: pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::VoidTy,
-                    false, false, false, false, CallingConv::C, false,
+                    false, false, false, false, 0, CallingConv::C, false,
                     getExternalSymbol("memcpy", TLI.getPointerTy()),
                     Args, *this, dl);
   return CallResult.second;
@@ -3421,7 +3421,7 @@ SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME:  pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::VoidTy,
-                    false, false, false, false, CallingConv::C, false,
+                    false, false, false, false, 0, CallingConv::C, false,
                     getExternalSymbol("memmove", TLI.getPointerTy()),
                     Args, *this, dl);
   return CallResult.second;
@@ -3473,7 +3473,7 @@ SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME: pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::VoidTy,
-                    false, false, false, false, CallingConv::C, false,
+                    false, false, false, false, 0, CallingConv::C, false,
                     getExternalSymbol("memset", TLI.getPointerTy()),
                     Args, *this, dl);
   return CallResult.second;
@@ -3605,7 +3605,8 @@ SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
 SDValue
 SelectionDAG::getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs,
                       bool IsTailCall, bool IsInreg, SDVTList VTs,
-                      const SDValue *Operands, unsigned NumOperands) {
+                      const SDValue *Operands, unsigned NumOperands,
+                      unsigned NumFixedArgs) {
   // Do not include isTailCall in the folding set profile.
   FoldingSetNodeID ID;
   AddNodeIDNode(ID, ISD::CALL, VTs, Operands, NumOperands);
@@ -3621,7 +3622,7 @@ SelectionDAG::getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs,
   }
   SDNode *N = NodeAllocator.Allocate<CallSDNode>();
   new (N) CallSDNode(CallingConv, dl, IsVarArgs, IsTailCall, IsInreg,
-                     VTs, Operands, NumOperands);
+                     VTs, Operands, NumOperands, NumFixedArgs);
   CSEMap.InsertNode(N, IP);
   AllNodes.push_back(N);
   return SDValue(N, 0);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index ca1cebc922..260911e3b9 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -4416,7 +4416,7 @@ void SelectionDAGLowering::LowerCallTo(CallSite CS, SDValue Callee,
     TLI.LowerCallTo(getRoot(), CS.getType(),
                     CS.paramHasAttr(0, Attribute::SExt),
                     CS.paramHasAttr(0, Attribute::ZExt), FTy->isVarArg(),
-                    CS.paramHasAttr(0, Attribute::InReg),
+                    CS.paramHasAttr(0, Attribute::InReg), FTy->getNumParams(),
                     CS.getCallingConv(),
                     IsTailCall && PerformTailCallOpt,
                     Callee, Args, DAG, getCurDebugLoc());
@@ -5468,7 +5468,7 @@ void SelectionDAGLowering::visitMalloc(MallocInst &I) {
 
   std::pair<SDValue,SDValue> Result =
     TLI.LowerCallTo(getRoot(), I.getType(), false, false, false, false,
-                    CallingConv::C, PerformTailCallOpt,
+                    0, CallingConv::C, PerformTailCallOpt,
                     DAG.getExternalSymbol("malloc", IntPtr),
                     Args, DAG, getCurDebugLoc());
   setValue(&I, Result.first);  // Pointers always fit in registers
@@ -5484,7 +5484,7 @@ void SelectionDAGLowering::visitFree(FreeInst &I) {
   MVT IntPtr = TLI.getPointerTy();
   std::pair<SDValue,SDValue> Result =
     TLI.LowerCallTo(getRoot(), Type::VoidTy, false, false, false, false,
-                    CallingConv::C, PerformTailCallOpt,
+                    0, CallingConv::C, PerformTailCallOpt,
                     DAG.getExternalSymbol("free", IntPtr), Args, DAG,
                     getCurDebugLoc());
   DAG.setRoot(Result.second);
@@ -5657,7 +5657,7 @@ void TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
 std::pair<SDValue, SDValue>
 TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
                             bool RetSExt, bool RetZExt, bool isVarArg,
-                            bool isInreg,
+                            bool isInreg, unsigned NumFixedArgs,
                             unsigned CallingConv, bool isTailCall,
                             SDValue Callee,
                             ArgListTy &Args, SelectionDAG &DAG, DebugLoc dl) {
@@ -5755,7 +5755,7 @@ TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
                             isVarArg, isTailCall, isInreg,
                             DAG.getVTList(&LoweredRetTys[0],
                                           LoweredRetTys.size()),
-                            &Ops[0], Ops.size()
+                            &Ops[0], Ops.size(), NumFixedArgs
                             );
   Chain = Res.getValue(LoweredRetTys.size() - 1);