// RUN: %clang_cc1 -triple i686-linux-gnu -std=c++20 -emit-llvm %s -disable-llvm-passes -o - | FileCheck %s --check-prefix=CHECK-O0 // RUN: %clang_cc1 -triple i686-linux-gnu -std=c++20 -emit-llvm %s -O1 -disable-llvm-passes -o - | FileCheck %s // Check that we add an llvm.invariant.start.p0i8 to mark when a global becomes // read-only. If globalopt can fold the initializer, it will then mark the // variable as constant. // Do not produce markers at -O0. // CHECK-O0-NOT: llvm.invariant.start.p0i8 struct A { A(); int n; }; // CHECK: @a ={{.*}} global {{.*}} zeroinitializer extern const A a = A(); struct A2 { A2(); constexpr ~A2() {} int n; }; // CHECK: @a2 ={{.*}} global {{.*}} zeroinitializer extern const A2 a2 = A2(); struct B { B(); mutable int n; }; // CHECK: @b ={{.*}} global {{.*}} zeroinitializer extern const B b = B(); struct C { C(); ~C(); int n; }; // CHECK: @c ={{.*}} global {{.*}} zeroinitializer extern const C c = C(); int f(); // CHECK: @d ={{.*}} global i32 0 extern const int d = f(); void e() { static const A a = A(); } // CHECK: call void @_ZN1AC1Ev(ptr noundef {{[^,]*}} @a) // CHECK: call {{.*}}@llvm.invariant.start.p0(i64 4, ptr @a) // CHECK: call void @_ZN2A2C1Ev(ptr noundef {{[^,]*}} @a2) // CHECK: call {{.*}}@llvm.invariant.start.p0(i64 4, ptr @a2) // CHECK: call void @_ZN1BC1Ev(ptr noundef {{[^,]*}} @b) // CHECK-NOT: call {{.*}}@llvm.invariant.start.p0(i64 noundef 4, ptr @b) // CHECK: call void @_ZN1CC1Ev(ptr noundef {{[^,]*}} @c) // CHECK-NOT: call {{.*}}@llvm.invariant.start.p0(i64 noundef 4, ptr @c) // CHECK: call noundef i32 @_Z1fv( // CHECK: store {{.*}}, ptr @d // CHECK: call {{.*}}@llvm.invariant.start.p0(i64 4, ptr @d) // CHECK-LABEL: define{{.*}} void @_Z1ev( // CHECK: call void @_ZN1AC1Ev(ptr noundef {{[^,]*}} @_ZZ1evE1a) // CHECK: call {{.*}}@llvm.invariant.start.p0(i64 4, ptr {{.*}}@_ZZ1evE1a) // CHECK-NOT: llvm.invariant.end