| Tim Northover | 1711cc9 | 2013-06-21 23:05:33 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -triple armv7-apple-ios -emit-llvm -o - %s | FileCheck %s |
| 2 | struct Empty {}; |
| 3 | |
| 4 | Empty emptyvar; |
| 5 | |
| 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); |
| David Blaikie | a953f28 | 2015-02-27 21:19:58 +0000 | [diff] [blame] | 12 | // CHECK: load i8*, i8** |
| Tim Northover | 1711cc9 | 2013-06-21 23:05:33 +0000 | [diff] [blame] | 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. |
| David Blaikie | a953f28 | 2015-02-27 21:19:58 +0000 | [diff] [blame] | 20 | // CHECK-NOT: load %struct.Empty, %struct.Empty* [[EMPTY_PTR]] |
| Tim Northover | 1711cc9 | 2013-06-21 23:05:33 +0000 | [diff] [blame] | 21 | |
| 22 | int i = __builtin_va_arg(l, int); |
| David Blaikie | a953f28 | 2015-02-27 21:19:58 +0000 | [diff] [blame] | 23 | // CHECK: load i32, i32* |
| Tim Northover | 1711cc9 | 2013-06-21 23:05:33 +0000 | [diff] [blame] | 24 | |
| 25 | __builtin_va_end(l); |
| 26 | return i; |
| 27 | } |