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