xref: /llvm-project/clang/test/CodeGenCXX/no-unique-address-2.cpp (revision 1b9a6e58a8b831193c9e5e733f881aabe0d2d06b) 
1 // RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
2 
3 struct TriviallyCopyable {};
4 
5 struct NonTriviallyCopyable {
6   NonTriviallyCopyable() = default;
7   NonTriviallyCopyable(const NonTriviallyCopyable&) = default;
NonTriviallyCopyableNonTriviallyCopyable8   NonTriviallyCopyable(NonTriviallyCopyable &&) {}
9 };
10 
11 struct Foo {
12   int i;
13   [[no_unique_address]] TriviallyCopyable m;
14   [[no_unique_address]] NonTriviallyCopyable n;
15 };
16 
call()17 void call() {
18   Foo foo;
19   Foo foo2(static_cast<Foo&&>(foo));
20 }
21 
22 // The memcpy call should copy exact 4 bytes for member 'int i'
23 // CHECK: define {{.*}} void @_ZN3FooC2EOS_
24 // CHECK:  call void @llvm.memcpy.p0.p0.i64(ptr {{.+}}, ptr {{.+}}, i64 4, i1 false)
25 // CHECK:  call void @_ZN20NonTriviallyCopyableC2EOS_
26