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

[Nikita Popov via llvm-commits]

https://github.com/nikic created https://github.com/llvm/llvm-project/pull/154089

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

>From 7c1f91f9202320c254638d71feba77c933293c9d Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov at redhat.com>
Date: Mon, 18 Aug 2025 12:38:11 +0200
Subject: [PATCH] [Hexagon] Remove custom vararg tracking (NFCI)

This information is now directly available, use the generic
CCIfArgVarArg.
---
 llvm/lib/Target/Hexagon/HexagonCallingConv.td |  9 ++-----
 .../Target/Hexagon/HexagonISelLowering.cpp    | 25 ++-----------------
 2 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/llvm/lib/Target/Hexagon/HexagonCallingConv.td b/llvm/lib/Target/Hexagon/HexagonCallingConv.td
index e0302b85fa948..fd6d873dd4188 100644
--- a/llvm/lib/Target/Hexagon/HexagonCallingConv.td
+++ b/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.
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index facea646d4b68..c54b67ccd8843 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/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);