clang/test/CodeGenCXX/no-unique-address-2.cpp

   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;
   8   NonTriviallyCopyable(NonTriviallyCopyable &&) {}
   9 };
  10
  11 struct Foo {
  12   int i;
  13   [[no_unique_address]] TriviallyCopyable m;
  14   [[no_unique_address]] NonTriviallyCopyable n;
  15 };
  16
  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_