[Hexagon] Remove custom vararg tracking (NFCI) (#154089)

This information is now directly available, use the generic
CCIfArgVarArg.

Author: nikic

llvm/lib/Target/Hexagon/HexagonCallingConv.td

@@ -6,11 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-class CCIfArgIsVarArg<CCAction A>
-  : CCIf<"State.isVarArg() && "
-         "ValNo >= static_cast<HexagonCCState&>(State)"
-         ".getNumNamedVarArgParams()", A>;
-
 def CC_HexagonStack: CallingConv<[
   CCIfType<[i32,v2i16,v4i8],
     CCAssignToStack<4,4>>,
@@ -28,7 +23,7 @@ def CC_Hexagon_Legacy: CallingConv<[
 
   CCIfByVal<
     CCPassByVal<8,8>>,
-  CCIfArgIsVarArg<
+  CCIfArgVarArg<
     CCDelegateTo<CC_HexagonStack>>,
 
   // Pass split values in pairs, allocate odd register if necessary.
@@ -58,7 +53,7 @@ def CC_Hexagon: CallingConv<[
 
   CCIfByVal<
     CCPassByVal<8,1>>,
-  CCIfArgIsVarArg<
+  CCIfArgVarArg<
     CCDelegateTo<CC_HexagonStack>>,
 
   // Pass split values in pairs, allocate odd register if necessary.

llvm/lib/Target/Hexagon/HexagonISelLowering.cpp

@@ -116,23 +116,6 @@ static cl::opt<bool>
                             cl::desc("Disable minimum alignment of 1 for "
                                      "arguments passed by value on stack"));
 
-namespace {
-
-  class HexagonCCState : public CCState {
-    unsigned NumNamedVarArgParams = 0;
-
-  public:
-    HexagonCCState(CallingConv::ID CC, bool IsVarArg, MachineFunction &MF,
-                   SmallVectorImpl<CCValAssign> &locs, LLVMContext &C,
-                   unsigned NumNamedArgs)
-        : CCState(CC, IsVarArg, MF, locs, C),
-          NumNamedVarArgParams(NumNamedArgs) {}
-    unsigned getNumNamedVarArgParams() const { return NumNamedVarArgParams; }
-  };
-
-} // end anonymous namespace
-
-
 // Implement calling convention for Hexagon.
 
 static bool CC_SkipOdd(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
@@ -497,7 +480,6 @@ HexagonTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
   MachineFrameInfo &MFI = MF.getFrameInfo();
   auto PtrVT = getPointerTy(MF.getDataLayout());
 
-  unsigned NumParams = CLI.CB ? CLI.CB->getFunctionType()->getNumParams() : 0;
   if (GlobalAddressSDNode *GAN = dyn_cast<GlobalAddressSDNode>(Callee))
     Callee = DAG.getTargetGlobalAddress(GAN->getGlobal(), dl, MVT::i32);
 
@@ -506,8 +488,7 @@ HexagonTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
 
   // Analyze operands of the call, assigning locations to each operand.
   SmallVector<CCValAssign, 16> ArgLocs;
-  HexagonCCState CCInfo(CallConv, TreatAsVarArg, MF, ArgLocs, *DAG.getContext(),
-                        NumParams);
+  CCState CCInfo(CallConv, TreatAsVarArg, MF, ArgLocs, *DAG.getContext());
 
   if (Subtarget.useHVXOps())
     CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon_HVX);
@@ -880,9 +861,7 @@ SDValue HexagonTargetLowering::LowerFormalArguments(
 
   // Assign locations to all of the incoming arguments.
   SmallVector<CCValAssign, 16> ArgLocs;
-  HexagonCCState CCInfo(CallConv, TreatAsVarArg, MF, ArgLocs,
-                        *DAG.getContext(),
-                        MF.getFunction().getFunctionType()->getNumParams());
+  CCState CCInfo(CallConv, TreatAsVarArg, MF, ArgLocs, *DAG.getContext());
 
   if (Subtarget.useHVXOps())
     CCInfo.AnalyzeFormalArguments(Ins, CC_Hexagon_HVX);