clang/test/CodeGen/union-non-trivial-member.cpp

   1 // RUN: %clang_cc1 --std=c++17 -emit-llvm %s -o - -triple x86_64-unknown-linux-gnu | FileCheck %s
   2
   3 struct non_trivial_constructor {
   4     constexpr non_trivial_constructor() : x(100) { }
   5     int x;
   6 };
   7
   8 union UnionInt {
   9     int a{1000};
  10     non_trivial_constructor b;
  11 };
  12
  13 union UnionNonTrivial {
  14     int a;
  15     non_trivial_constructor b{};
  16 };
  17
  18 void f() {
  19     UnionInt u1;
  20     UnionNonTrivial u2;
  21 }
  22
  23 // CHECK:      define dso_local void @_Z1fv()
  24 // CHECK:        call void @_ZN8UnionIntC1Ev
  25 // CHECK-NEXT:   call void @_ZN15UnionNonTrivialC1Ev
  26
  27 // CHECK:      define {{.*}}void @_ZN8UnionIntC1Ev
  28 // CHECK:        call void @_ZN8UnionIntC2Ev
  29
  30 // CHECK:      define {{.*}}void @_ZN15UnionNonTrivialC1Ev
  31 // CHECK:        call void @_ZN15UnionNonTrivialC2Ev
  32
  33 // CHECK:      define {{.*}}void @_ZN8UnionIntC2Ev
  34 // CHECK:        store i32 1000
  35
  36 // CHECK:      define {{.*}}void @_ZN15UnionNonTrivialC2Ev
  37 // CHECK:        call void @_ZN23non_trivial_constructorC1Ev