[clang] [libc] [llvm] [NVPTX] Implement variadic functions using IR lowering (PR #96015)

[Jon Chesterfield via cfe-commits]

================
@@ -203,8 +203,15 @@ ABIArgInfo NVPTXABIInfo::classifyArgumentType(QualType Ty) 
const {
 void NVPTXABIInfo::computeInfo(CGFunctionInfo &FI) const {
   if (!getCXXABI().classifyReturnType(FI))
     FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type);
+
+  unsigned ArgumentsCount = 0;
+  for (auto &I : FI.arguments()) {
+    if (FI.isVariadic() && ArgumentsCount > 0)
----------------
JonChesterfield wrote:

Look at amdgpu, it does exactly that normal lowering for fixed and something 
different for variadic.

https://github.com/llvm/llvm-project/pull/96015
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