1 // RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++2a %s -emit-llvm -o - | FileCheck %s
2 
3 // CHECK-DAG: @a = external thread_local global i32
4 extern thread_local int a;
5 
6 // CHECK-DAG: @b = external thread_local global i32
7 extern thread_local constinit int b;
8 
9 // CHECK-LABEL: define i32 @_Z1fv()
10 // CHECK: call i32* @_ZTW1a()
11 // CHECK: }
12 int f() { return a; }
13 
14 // CHECK-LABEL: define linkonce_odr {{.*}} @_ZTW1a()
15 // CHECK: br i1
16 // CHECK: call void @_ZTH1a()
17 // CHECK: }
18 
19 // CHECK-LABEL: define i32 @_Z1gv()
20 // CHECK-NOT: call
21 // CHECK: load i32, i32* @b
22 // CHECK-NOT: call
23 // CHECK: }
24 int g() { return b; }
25 
26 // CHECK-NOT: define {{.*}} @_ZTW1b()
27 
28 extern thread_local int c;
29 
30 // CHECK-LABEL: define i32 @_Z1hv()
31 // CHECK: call i32* @_ZTW1c()
32 // CHECK: load i32, i32* %
33 // CHECK: }
34 int h() { return c; }
35 
36 thread_local int c = 0;
37 
38 int d_init();
39 thread_local int d = d_init();
40 
41 // Note: use of 'c' does not trigger initialization of 'd', because 'c' has a
42 // constant initializer.
43 // CHECK-LABEL: define weak_odr {{.*}} @_ZTW1c()
44 // CHECK-NOT: br i1
45 // CHECK-NOT: call
46 // CHECK: ret i32* @c
47 // CHECK: }
48