copy-constructor-elim.cpp
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// RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
// RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s | FileCheck %s -check-prefix MS
// CHECK-NOT: _ZN1CC1ERK1C
// CHECK-NOT: _ZN1SC1ERK1S
// MS-NOT: ?0C@@QAE@ABV0
// MS-NOT: ?0S@@QAE@ABV0
extern "C" int printf(...);
struct C {
C() : iC(6) {printf("C()\n"); }
C(const C& c) { printf("C(const C& c)\n"); }
int iC;
};
C foo() {
return C();
};
class X { // ...
public:
X(int) {}
X(const X&, int i = 1, int j = 2, C c = foo()) {
printf("X(const X&, %d, %d, %d)\n", i, j, c.iC);
}
};
struct S {
S();
};
S::S() { printf("S()\n"); }
void Call(S) {};
int main() {
X a(1);
X b(a, 2);
X c = b;
X d(a, 5, 6);
S s;
Call(s);
}
struct V {
int x;
};
typedef V V_over_aligned __attribute((aligned(8)));
extern const V_over_aligned gv1 = {};
extern "C" V f() { return gv1; }
// Make sure that we obey the destination's alignment requirements when emitting
// the copy.
// CHECK-LABEL: define {{.*}} @f(
// 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)