clang/test/CodeGenCXX/copy-constructor-elim.cpp

   1 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
   2 // RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s | FileCheck %s -check-prefix MS
   3 // CHECK-NOT: _ZN1CC1ERK1C
   4 // CHECK-NOT: _ZN1SC1ERK1S
   5 // MS-NOT: ?0C@@QAE@ABV0
   6 // MS-NOT: ?0S@@QAE@ABV0
   7
   8 extern "C" int printf(...);
   9
  10
  11 struct C {
  12   C() : iC(6) {printf("C()\n"); }
  13   C(const C& c) { printf("C(const C& c)\n"); }
  14   int iC;
  15 };
  16
  17 C foo() {
  18   return C();
  19 };
  20
  21 class X { // ...
  22 public:
  23   X(int) {}
  24   X(const X&, int i = 1, int j = 2, C c = foo()) {
  25     printf("X(const X&, %d, %d, %d)\n", i, j, c.iC);
  26   }
  27 };
  28
  29
  30 struct S {
  31   S();
  32 };
  33
  34 S::S() { printf("S()\n"); }
  35
  36 void Call(S) {};
  37
  38 int main() {
  39   X a(1);
  40   X b(a, 2);
  41   X c = b;
  42   X d(a, 5, 6);
  43   S s;
  44   Call(s);
  45 }
  46
  47 struct V {
  48   int x;
  49 };
  50
  51 typedef V V_over_aligned __attribute((aligned(8)));
  52 extern const V_over_aligned gv1 = {};
  53
  54 extern "C" V f() { return gv1; }
  55
  56 // Make sure that we obey the destination's alignment requirements when emitting
  57 // the copy.
  58 // CHECK-LABEL: define {{.*}} @f(
  59 // CHECK:   call void @llvm.memcpy.p0i8.p0i8.{{i64|i32}}({{.*}}align 4{{.*}}, i8* align 8 bitcast (%struct.V* @gv1 to i8*), {{i64|i32}} 4, i1 false)