[SelectionDAG] Extract out populateCallLoweringInfo; NFC

SelectionDAGBuilder::populateCallLoweringInfo is now used instead of
SelectionDAGBuilder::lowerCallOperands.  The populateCallLoweringInfo
interface is more composable in face of design changes like
http://reviews.llvm.org/D18106

llvm-svn: 263663

Author: sanjoy

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -6896,16 +6896,16 @@ SDValue SelectionDAGBuilder::lowerRangeToAssertZExt(SelectionDAG &DAG,
   return DAG.getMergeValues(Ops, SL);
 }
 
-/// \brief Lower an argument list according to the target calling convention.
-///
-/// \return A tuple of <return-value, token-chain>
+/// \brief Populate a CallLowerinInfo (into \p CLI) based on the properties of
+/// the call being lowered.
 ///
 /// This is a helper for lowering intrinsics that follow a target calling
 /// convention or require stack pointer adjustment. Only a subset of the
 /// intrinsic's operands need to participate in the calling convention.
-std::pair<SDValue, SDValue> SelectionDAGBuilder::lowerCallOperands(
-    ImmutableCallSite CS, unsigned ArgIdx, unsigned NumArgs, SDValue Callee,
-    Type *ReturnTy, const BasicBlock *EHPadBB, bool IsPatchPoint) {
+void SelectionDAGBuilder::populateCallLoweringInfo(
+    TargetLowering::CallLoweringInfo &CLI, ImmutableCallSite CS,
+    unsigned ArgIdx, unsigned NumArgs, SDValue Callee, Type *ReturnTy,
+    bool IsPatchPoint) {
   TargetLowering::ArgListTy Args;
   Args.reserve(NumArgs);
 
@@ -6924,12 +6924,12 @@ std::pair<SDValue, SDValue> SelectionDAGBuilder::lowerCallOperands(
     Args.push_back(Entry);
   }
 
-  TargetLowering::CallLoweringInfo CLI(DAG);
-  CLI.setDebugLoc(getCurSDLoc()).setChain(getRoot())
-    .setCallee(CS.getCallingConv(), ReturnTy, Callee, std::move(Args), NumArgs)
-    .setDiscardResult(CS->use_empty()).setIsPatchPoint(IsPatchPoint);
-
-  return lowerInvokable(CLI, EHPadBB);
+  CLI.setDebugLoc(getCurSDLoc())
+      .setChain(getRoot())
+      .setCallee(CS.getCallingConv(), ReturnTy, Callee, std::move(Args),
+                 NumArgs)
+      .setDiscardResult(CS->use_empty())
+      .setIsPatchPoint(IsPatchPoint);
 }
 
 /// \brief Add a stack map intrinsic call's live variable operands to a stackmap
@@ -7070,8 +7070,11 @@ void SelectionDAGBuilder::visitPatchpoint(ImmutableCallSite CS,
   unsigned NumCallArgs = IsAnyRegCC ? 0 : NumArgs;
   Type *ReturnTy =
     IsAnyRegCC ? Type::getVoidTy(*DAG.getContext()) : CS->getType();
-  std::pair<SDValue, SDValue> Result = lowerCallOperands(
-      CS, NumMetaOpers, NumCallArgs, Callee, ReturnTy, EHPadBB, true);
+
+  TargetLowering::CallLoweringInfo CLI(DAG);
+  populateCallLoweringInfo(CLI, CS, NumMetaOpers, NumCallArgs, Callee, ReturnTy,
+                           true);
+  std::pair<SDValue, SDValue> Result = lowerInvokable(CLI, EHPadBB);
 
   SDNode *CallEnd = Result.second.getNode();
   if (HasDef && (CallEnd->getOpcode() == ISD::CopyFromReg))

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

@@ -713,14 +713,14 @@ class SelectionDAGBuilder {
   SDValue lowerRangeToAssertZExt(SelectionDAG &DAG, const Instruction &I,
                                  SDValue Op);
 
-  std::pair<SDValue, SDValue> lowerCallOperands(
-          ImmutableCallSite CS,
-          unsigned ArgIdx,
-          unsigned NumArgs,
-          SDValue Callee,
-          Type *ReturnTy,
-          const BasicBlock *EHPadBB = nullptr,
-          bool IsPatchPoint = false);
+  void populateCallLoweringInfo(TargetLowering::CallLoweringInfo &CLI,
+                                ImmutableCallSite CS, unsigned ArgIdx,
+                                unsigned NumArgs, SDValue Callee,
+                                Type *ReturnTy, bool IsPatchPoint);
+
+  std::pair<SDValue, SDValue>
+  lowerInvokable(TargetLowering::CallLoweringInfo &CLI,
+                 const BasicBlock *EHPadBB = nullptr);
 
   /// UpdateSplitBlock - When an MBB was split during scheduling, update the
   /// references that need to refer to the last resulting block.
@@ -731,10 +731,6 @@ class SelectionDAGBuilder {
   void LowerStatepoint(ImmutableStatepoint Statepoint,
                        const BasicBlock *EHPadBB = nullptr);
 private:
-  std::pair<SDValue, SDValue>
-  lowerInvokable(TargetLowering::CallLoweringInfo &CLI,
-                 const BasicBlock *EHPadBB = nullptr);
-
   // Terminator instructions.
   void visitRet(const ReturnInst &I);
   void visitBr(const BranchInst &I);

llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp

@@ -311,11 +311,13 @@ lowerCallFromStatepoint(ImmutableStatepoint ISP, const BasicBlock *EHPadBB,
   Type *DefTy = ISP.getActualReturnType();
   bool HasDef = !DefTy->isVoidTy();
 
+  TargetLowering::CallLoweringInfo CLI(Builder.DAG);
+  Builder.populateCallLoweringInfo(
+      CLI, ISP.getCallSite(), ImmutableStatepoint::CallArgsBeginPos,
+      ISP.getNumCallArgs(), ActualCallee, DefTy, false);
+
   SDValue ReturnValue, CallEndVal;
-  std::tie(ReturnValue, CallEndVal) = Builder.lowerCallOperands(
-      ISP.getCallSite(), ImmutableStatepoint::CallArgsBeginPos,
-      ISP.getNumCallArgs(), ActualCallee, DefTy, EHPadBB,
-      false /* IsPatchPoint */);
+  std::tie(ReturnValue, CallEndVal) = Builder.lowerInvokable(CLI, EHPadBB);
 
   SDNode *CallEnd = CallEndVal.getNode();