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 -o - | FileCheck %s 3 4// Check that we add an llvm.invariant.start 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 10 11struct A { 12 A(); 13 int n; 14}; 15 16// CHECK: @a = global {{.*}} zeroinitializer 17extern const A a = A(); 18 19struct B { 20 B(); 21 mutable int n; 22}; 23 24// CHECK: @b = global {{.*}} zeroinitializer 25extern const B b = B(); 26 27struct C { 28 C(); 29 ~C(); 30 int n; 31}; 32 33// CHECK: @c = global {{.*}} zeroinitializer 34extern const C c = C(); 35 36int f(); 37// CHECK: @d = global i32 0 38extern const int d = f(); 39 40void e() { 41 static const A a = A(); 42} 43 44// CHECK: call void @_ZN1AC1Ev({{.*}}* @a) 45// CHECK: call {{.*}}@llvm.invariant.start(i64 4, i8* bitcast ({{.*}} @a to i8*)) 46 47// CHECK: call void @_ZN1BC1Ev({{.*}}* @b) 48// CHECK-NOT: call {{.*}}@llvm.invariant.start(i64 4, i8* bitcast ({{.*}} @b to i8*)) 49 50// CHECK: call void @_ZN1CC1Ev({{.*}}* @c) 51// CHECK-NOT: call {{.*}}@llvm.invariant.start(i64 4, i8* bitcast ({{.*}} @c to i8*)) 52 53// CHECK: call i32 @_Z1fv( 54// CHECK: store {{.*}}, i32* @d 55// CHECK: call {{.*}}@llvm.invariant.start(i64 4, i8* bitcast ({{.*}} @d to i8*)) 56 57// CHECK-LABEL: define void @_Z1ev( 58// CHECK: call void @_ZN1AC1Ev(%struct.A* @_ZZ1evE1a) 59// CHECK: call {{.*}}@llvm.invariant.start(i64 4, i8* bitcast ({{.*}} @_ZZ1evE1a to i8*)) 60// CHECK-NOT: llvm.invariant.end 61