1 // RUN: %clang_cc1 -triple arm64-apple-ios -target-abi darwinpcs -emit-llvm -o - %s | FileCheck %s 2 struct Empty {}; 3 4 Empty emptyvar; 5 take_args(int a,...)6 int take_args(int a, ...) { 7 __builtin_va_list l; 8 __builtin_va_start(l, a); 9 // CHECK: call void @llvm.va_start 10 11 emptyvar = __builtin_va_arg(l, Empty); 12 // CHECK: load i8*, i8** 13 // CHECK-NOT: getelementptr 14 // CHECK: [[EMPTY_PTR:%[a-zA-Z0-9._]+]] = bitcast i8* {{%[a-zA-Z0-9._]+}} to %struct.Empty* 15 16 // It's conceivable that EMPTY_PTR may not actually be a valid pointer 17 // (e.g. it's at the very bottom of the stack and the next page is 18 // invalid). This doesn't matter provided it's never loaded (there's no 19 // well-defined way to tell), but it becomes a problem if we do try to use it. 20 // CHECK-NOT: load %struct.Empty, %struct.Empty* [[EMPTY_PTR]] 21 22 int i = __builtin_va_arg(l, int); 23 // CHECK: va_arg i8** {{%[a-zA-Z0-9._]+}}, i32 24 25 __builtin_va_end(l); 26 return i; 27 } 28