1 // RUN: %clang_cc1 -triple i386-pc-win32 -emit-llvm %s -o - | FileCheck %s
2 
3 // PR15768
4 
5 // A trivial 20 byte struct is returned indirectly and taken as byval.
6 struct S {
7   S();
8   int a, b, c, d, e;
9 };
10 
11 struct C {
12   S variadic_sret(const char *f, ...);
13   S __cdecl cdecl_sret();
14   S __cdecl byval_and_sret(S a);
15   int c;
16 };
17 
18 S C::variadic_sret(const char *f, ...) { return S(); }
19 S C::cdecl_sret() { return S(); }
20 S C::byval_and_sret(S a) { return S(); }
21 
22 // CHECK: define dso_local void @"?variadic_sret@C@@QAA?AUS@@PBDZZ"(%struct.C* {{[^,]*}} %this, %struct.S* noalias sret(%struct.S) align 4 %agg.result, i8* noundef %f, ...)
23 // CHECK: define dso_local void @"?cdecl_sret@C@@QAA?AUS@@XZ"(%struct.C* {{[^,]*}} %this, %struct.S* noalias sret(%struct.S) align 4 %agg.result)
24 // CHECK: define dso_local void @"?byval_and_sret@C@@QAA?AUS@@U2@@Z"(%struct.C* {{[^,]*}} %this, %struct.S* noalias sret(%struct.S) align 4 %agg.result, %struct.S* noundef byval(%struct.S) align 4 %a)
25 
26 int main() {
27   C c;
28   c.variadic_sret("asdf");
29   c.cdecl_sret();
30   c.byval_and_sret(S());
31 }
32 // CHECK-LABEL: define dso_local noundef i32 @main()
33 // CHECK: call void {{.*}} @"?variadic_sret@C@@QAA?AUS@@PBDZZ"
34 // CHECK: call void @"?cdecl_sret@C@@QAA?AUS@@XZ"
35 // CHECK: call void @"?byval_and_sret@C@@QAA?AUS@@U2@@Z"
36 
37 // __fastcall has similar issues.
38 struct A {
39   S __fastcall f(int x);
40 };
41 S A::f(int x) {
42   return S();
43 }
44 // CHECK-LABEL: define dso_local x86_fastcallcc void @"?f@A@@QAI?AUS@@H@Z"(%struct.A* inreg noundef %this, %struct.S* inreg noalias sret(%struct.S) align 4 %agg.result, i32 noundef %x)
45