1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks %s -emit-llvm -o - | FileCheck %s -check-prefix=UNINIT
2 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=pattern %s -emit-llvm -o - | FileCheck %s -check-prefix=PATTERN
3 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fblocks -ftrivial-auto-var-init=zero %s -emit-llvm -o - | FileCheck %s -check-prefix=ZERO
4 
5 template<typename T> void used(T &) noexcept;
6 
7 extern "C" {
8 
9 // UNINIT-LABEL:  test_attribute_uninitialized(
10 // UNINIT:      alloca
11 // UNINIT-NEXT: call void
12 // ZERO-LABEL:    test_attribute_uninitialized(
13 // ZERO:      alloca
14 // ZERO-NEXT: call void
15 // PATTERN-LABEL: test_attribute_uninitialized(
16 // PATTERN:      alloca
17 // PATTERN-NEXT: call void
18 void test_attribute_uninitialized() {
19   [[clang::uninitialized]] int i;
20   used(i);
21 }
22 
23 } // extern "C"
24