1 // RUN: %clang_cc1 -triple i686-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK-O0
2 // RUN: %clang_cc1 -triple i686-linux-gnu -emit-llvm %s -O1 -fno-experimental-new-pass-manager -o - | FileCheck %s
3
4 // Check that we add an llvm.invariant.start.p0i8 to mark when a global becomes
5 // read-only. If globalopt can fold the initializer, it will then mark the
6 // variable as constant.
7
8 // Do not produce markers at -O0.
9 // CHECK-O0-NOT: llvm.invariant.start.p0i8
10
11 struct A {
12 A();
13 int n;
14 };
15
16 // CHECK: @a ={{.*}} global {{.*}} zeroinitializer
17 extern const A a = A();
18
19 struct B {
20 B();
21 mutable int n;
22 };
23
24 // CHECK: @b ={{.*}} global {{.*}} zeroinitializer
25 extern const B b = B();
26
27 struct C {
28 C();
29 ~C();
30 int n;
31 };
32
33 // CHECK: @c ={{.*}} global {{.*}} zeroinitializer
34 extern const C c = C();
35
36 int f();
37 // CHECK: @d ={{.*}} global i32 0
38 extern const int d = f();
39
e()40 void e() {
41 static const A a = A();
42 }
43
44 // CHECK: call void @_ZN1AC1Ev({{.*}}* nonnull {{[^,]*}} @a)
45 // CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @a to i8*))
46
47 // CHECK: call void @_ZN1BC1Ev({{.*}}* nonnull {{[^,]*}} @b)
48 // CHECK-NOT: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @b to i8*))
49
50 // CHECK: call void @_ZN1CC1Ev({{.*}}* nonnull {{[^,]*}} @c)
51 // CHECK-NOT: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @c to i8*))
52
53 // CHECK: call i32 @_Z1fv(
54 // CHECK: store {{.*}}, i32* @d
55 // CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @d to i8*))
56
57 // CHECK-LABEL: define{{.*}} void @_Z1ev(
58 // CHECK: call void @_ZN1AC1Ev(%struct.A* nonnull {{[^,]*}} @_ZZ1evE1a)
59 // CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* {{.*}}bitcast ({{.*}} @_ZZ1evE1a to i8*))
60 // CHECK-NOT: llvm.invariant.end
61