| // RUN: %clang_cc1 -triple i686-linux-gnu -emit-llvm %s -o - | FileCheck %s |
| |
| // Check that we add an llvm.invariant.start to mark when a global becomes |
| // read-only. If globalopt can fold the initializer, it will then mark the |
| // variable as constant. |
| |
| struct A { |
| A() : n(42) {} |
| int n; |
| }; |
| |
| // CHECK: @a = global {{.*}} zeroinitializer |
| extern const A a = A(); |
| |
| struct B { |
| B() : n(76) {} |
| mutable int n; |
| }; |
| |
| // CHECK: @b = global {{.*}} zeroinitializer |
| extern const B b = B(); |
| |
| struct C { |
| C() : n(81) {} |
| ~C(); |
| int n; |
| }; |
| |
| // CHECK: @c = global {{.*}} zeroinitializer |
| extern const C c = C(); |
| |
| int f() { return 5; } |
| // CHECK: @d = global i32 0 |
| extern const int d = f(); |
| |
| void e() { |
| static const A a = A(); |
| } |
| |
| // CHECK: define internal void @__cxx_global_var_init |
| // CHECK: call void @_ZN1AC1Ev({{.*}}* @a) |
| // CHECK-NEXT: call {{.*}}@llvm.invariant.start(i64 -1, i8* bitcast ({{.*}} @a to i8*)) |
| |
| // CHECK: define internal void @__cxx_global_var_init |
| // CHECK: call void @_ZN1BC1Ev({{.*}}* @b) |
| // CHECK-NOT: call {{.*}}@llvm.invariant.start(i64 -1, i8* bitcast ({{.*}} @b to i8*)) |
| |
| // CHECK: define internal void @__cxx_global_var_init |
| // CHECK: call void @_ZN1CC1Ev({{.*}}* @c) |
| // CHECK-NOT: call {{.*}}@llvm.invariant.start(i64 -1, i8* bitcast ({{.*}} @c to i8*)) |
| |
| // CHECK: define internal void @__cxx_global_var_init |
| // CHECK: call i32 @_Z1fv( |
| // CHECK: store {{.*}}, i32* @d |
| // CHECK: call {{.*}}@llvm.invariant.start(i64 -1, i8* bitcast ({{.*}} @d to i8*)) |
| |
| // CHECK: define void @_Z1ev( |
| // CHECK: call void @_ZN1AC1Ev(%struct.A* @_ZZ1evE1a) |
| // CHECK: call {{.*}}@llvm.invariant.start(i64 -1, i8* bitcast ({{.*}} @_ZZ1evE1a to i8*)) |
| // CHECK-NOT: llvm.invariant.end |
