1373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// RUN: %clang_cc1 -triple armv7-apple-ios -emit-llvm -o - %s | FileCheck %s 2373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northoverstruct Empty {}; 3373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 4373ac0ab90a2d61fad7dd991712b8cec30c14604Tim NorthoverEmpty emptyvar; 5373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 6373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northoverint take_args(int a, ...) { 7373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover __builtin_va_list l; 8373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover __builtin_va_start(l, a); 9373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK: call void @llvm.va_start 10373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 11373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover emptyvar = __builtin_va_arg(l, Empty); 12373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK: load i8** 13373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK-NOT: getelementptr 14373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK: [[EMPTY_PTR:%[a-zA-Z0-9._]+]] = bitcast i8* {{%[a-zA-Z0-9._]+}} to %struct.Empty* 15373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 16373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover // It's conceivable that EMPTY_PTR may not actually be a valid pointer 17373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover // (e.g. it's at the very bottom of the stack and the next page is 18373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover // invalid). This doesn't matter provided it's never loaded (there's no 19373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover // well-defined way to tell), but it becomes a problem if we do try to use it. 20373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK-NOT: load %struct.Empty* [[EMPTY_PTR]] 21373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 22373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover int i = __builtin_va_arg(l, int); 23373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover// CHECK: load i32* 24373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover 25373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover __builtin_va_end(l); 26373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover return i; 27373ac0ab90a2d61fad7dd991712b8cec30c14604Tim Northover} 28