================
@@ -7011,6 +6976,36 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl
GD, unsigned BuiltinID,
return RValue::get(Builder.CreateStore(ArgPtr, DestAddr));
}
+ case Builtin::BI__builtin_zos_va_start:
+ case Builtin::BI__builtin_zos_va_end: {
+ // The va_list is an array with 2 elements, called curr and next.
+ // Element curr is set to 0. For builtin_zos_va_start, next is initialized
+ // with a call to @llvm.va_start. Otherwise, next is passed to
@llvm.va_end.
+ Address VAList = EmitZOSVAListRef(E->getArg(0));
+ llvm::Type *VAListTy = ConvertType(getContext().getBuiltinZOSVaListType());
+ VAList = VAList.withElementType(VAListTy);
+ Address Curr = Builder.CreateConstArrayGEP(VAList, 0, "curr");
+ Value *Zero = llvm::Constant::getNullValue(VoidPtrTy);
+ Builder.CreateStore(Zero, Curr);
+ Address Next = Builder.CreateConstArrayGEP(VAList, 1, "next");
+ return RValue::get(
+ EmitVAStartEnd(Next.emitRawPointer(*this),
+ BuiltinID == Builtin::BI__builtin_zos_va_start));
+ }
+ case Builtin::BI__builtin_zos_va_copy: {
+ // Lower this manually because later can't reliably determine the type.
----------------
redstar wrote:
```suggestion
// Lower this manually because later can't reliably determine the type.
```
https://github.com/llvm/llvm-project/pull/202397
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