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