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// RUN: %clang_cc1 -triple i386-pc-win32 -emit-llvm %s -o - | FileCheck %s
// PR15768
// A trivial 20 byte struct is returned indirectly and taken as byval.
struct S {
S();
int a, b, c, d, e;
};
struct C {
S variadic_sret(const char *f, ...);
S __cdecl cdecl_sret();
S __cdecl byval_and_sret(S a);
int c;
};
S C::variadic_sret(const char *f, ...) { return S(); }
S C::cdecl_sret() { return S(); }
S C::byval_and_sret(S a) { return S(); }
// 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, ...)
// CHECK: define dso_local void @"?cdecl_sret@C@@QAA?AUS@@XZ"(%struct.C* {{[^,]*}} %this, %struct.S* noalias sret(%struct.S) align 4 %agg.result)
// 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)
int main() {
C c;
c.variadic_sret("asdf");
c.cdecl_sret();
c.byval_and_sret(S());
}
// CHECK-LABEL: define dso_local noundef i32 @main()
// CHECK: call void {{.*}} @"?variadic_sret@C@@QAA?AUS@@PBDZZ"
// CHECK: call void @"?cdecl_sret@C@@QAA?AUS@@XZ"
// CHECK: call void @"?byval_and_sret@C@@QAA?AUS@@U2@@Z"
// __fastcall has similar issues.
struct A {
S __fastcall f(int x);
};
S A::f(int x) {
return S();
}
// CHECK-LABEL: define dso_local x86_fastcallcc void @"?f@A@@QAI?AUS@@H@Z"(%struct.A* inreg noundef nonnull align 1 dereferenceable(1) %this, %struct.S* inreg noalias sret(%struct.S) align 4 %agg.result, i32 noundef %x)
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