Replace some std::vectors that showed up in heap profiling with

SmallVectors. Change the signature of TargetLowering::LowerArguments
to avoid returning a vector by value, and update the two targets
which still use this directly, Sparc and IA64, accordingly.

llvm-svn: 52917

include/llvm/Target/TargetLowering.h

@@ -964,8 +964,9 @@ public:
 
   /// LowerArguments - This hook must be implemented to indicate how we should
   /// lower the arguments for the specified function, into the specified DAG.
-  virtual std::vector<SDOperand>
-  LowerArguments(Function &F, SelectionDAG &DAG);
+  virtual void
+  LowerArguments(Function &F, SelectionDAG &DAG,
+                 SmallVectorImpl<SDOperand>& ArgValues);
 
   /// LowerCallTo - This hook lowers an abstract call to a function into an
   /// actual call.  This returns a pair of operands.  The first element is the

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -474,7 +474,7 @@ class SelectionDAGLowering {
   /// them up and then emit token factor nodes when possible.  This allows us to
   /// get simple disambiguation between loads without worrying about alias
   /// analysis.
-  std::vector<SDOperand> PendingLoads;
+  SmallVector<SDOperand, 8> PendingLoads;
 
   /// PendingExports - CopyToReg nodes that copy values to virtual registers
   /// for export to other blocks need to be emitted before any terminator
@@ -4612,16 +4612,16 @@ void SelectionDAGLowering::visitVACopy(CallInst &I) {
 /// implementation, which just inserts a FORMAL_ARGUMENTS node.  FIXME: When all
 /// targets are migrated to using FORMAL_ARGUMENTS, this hook should be 
 /// integrated into SDISel.
-std::vector<SDOperand> 
-TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
+void TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
+                                    SmallVectorImpl<SDOperand> &ArgValues) {
   // Add CC# and isVararg as operands to the FORMAL_ARGUMENTS node.
-  std::vector<SDOperand> Ops;
+  SmallVector<SDOperand, 3+16> Ops;
   Ops.push_back(DAG.getRoot());
   Ops.push_back(DAG.getConstant(F.getCallingConv(), getPointerTy()));
   Ops.push_back(DAG.getConstant(F.isVarArg(), getPointerTy()));
 
   // Add one result value for each formal argument.
-  std::vector<MVT> RetVals;
+  SmallVector<MVT, 16> RetVals;
   unsigned j = 1;
   for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
        I != E; ++I, ++j) {
@@ -4699,7 +4699,6 @@ TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
   DAG.setRoot(SDOperand(Result, NumArgRegs));
 
   // Set up the return result vector.
-  Ops.clear();
   unsigned i = 0;
   unsigned Idx = 1;
   for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; 
@@ -4722,12 +4721,11 @@ TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
       else if (F.paramHasAttr(Idx, ParamAttr::ZExt))
         AssertOp = ISD::AssertZext;
 
-      Ops.push_back(getCopyFromParts(DAG, &Parts[0], NumParts, PartVT, VT,
+      ArgValues.push_back(getCopyFromParts(DAG, &Parts[0], NumParts, PartVT, VT,
                                            AssertOp));
     }
   }
   assert(i == NumArgRegs && "Argument register count mismatch!");
-  return Ops;
 }
 
 
@@ -4951,7 +4949,8 @@ LowerArguments(BasicBlock *LLVMBB, SelectionDAGLowering &SDL) {
   Function &F = *LLVMBB->getParent();
   FunctionLoweringInfo &FuncInfo = SDL.FuncInfo;
   SDOperand OldRoot = SDL.DAG.getRoot();
-  std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG);
+  SmallVector<SDOperand, 16> Args;
+  TLI.LowerArguments(F, SDL.DAG, Args);
 
   unsigned a = 0;
   for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end();

lib/Target/IA64/IA64ISelLowering.cpp

@@ -143,9 +143,8 @@ MVT IA64TargetLowering::getSetCCResultType(const SDOperand &) const {
   return MVT::i1;
 }
 
-std::vector<SDOperand>
-IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
-  std::vector<SDOperand> ArgValues;
+void IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
+                                        SmallVectorImpl<SDOperand> &ArgValues) {
   //
   // add beautiful description of IA64 stack frame format
   // here (from intel 24535803.pdf most likely)
@@ -300,8 +299,6 @@ IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
     MF.getRegInfo().addLiveOut(IA64::F8);
     break;
   }
-
-  return ArgValues;
 }
 
 std::pair<SDOperand, SDOperand>

lib/Target/IA64/IA64ISelLowering.h

@@ -53,8 +53,8 @@ namespace llvm {
       
     /// LowerArguments - This hook must be implemented to indicate how we should
     /// lower the arguments for the specified function, into the specified DAG.
-    virtual std::vector<SDOperand>
-      LowerArguments(Function &F, SelectionDAG &DAG);
+    virtual void LowerArguments(Function &F, SelectionDAG &DAG,
+                                SmallVectorImpl<SDOperand> &ArgValues);
     
     /// LowerCallTo - This hook lowers an abstract call to a function into an
     /// actual call.

lib/Target/Sparc/SparcISelLowering.cpp

@@ -74,11 +74,11 @@ static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
 /// LowerArguments - V8 uses a very simple ABI, where all values are passed in
 /// either one or two GPRs, including FP values.  TODO: we should pass FP values
 /// in FP registers for fastcc functions.
-std::vector<SDOperand>
-SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
+void
+SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
+                                    SmallVectorImpl<SDOperand> &ArgValues) {
   MachineFunction &MF = DAG.getMachineFunction();
   MachineRegisterInfo &RegInfo = MF.getRegInfo();
-  std::vector<SDOperand> ArgValues;
   
   static const unsigned ArgRegs[] = {
     SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
@@ -221,8 +221,6 @@ SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
   if (!OutChains.empty())
     DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other,
                             &OutChains[0], OutChains.size()));
-  
-  return ArgValues;
 }
 
 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {

lib/Target/Sparc/SparcISelLowering.h

@@ -57,8 +57,8 @@ namespace llvm {
                                                 const SelectionDAG &DAG,
                                                 unsigned Depth = 0) const;
     
-    virtual std::vector<SDOperand>
-      LowerArguments(Function &F, SelectionDAG &DAG);
+    virtual void LowerArguments(Function &F, SelectionDAG &DAG,
+                                SmallVectorImpl<SDOperand> &ArgValues);
     virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
                                                         MachineBasicBlock *MBB);