28 lines · cpp
1// RUN: %clang_cc1 -triple=i686 -emit-llvm -o - %s | FileCheck %s2 3 4struct X;5typedef void (X::*memptr)();6 7struct A {8 virtual memptr f();9};10 11struct B {12 virtual memptr f();13};14 15struct C : A, B {16 C();17 memptr f() override __attribute__((noinline)) { return nullptr; };18};19 20C::C() {}21 22// Make sure the member pointer is returned from the thunk via the return slot.23// Because of the tail call, the return value cannot be copied into a local24// alloca. (PR39901)25 26// CHECK-LABEL: define linkonce_odr void @_ZThn4_N1C1fEv(ptr dead_on_unwind noalias writable sret({ i32, i32 }) align 4 %agg.result, ptr noundef %this)27// CHECK: tail call void @_ZN1C1fEv(ptr dead_on_unwind writable sret({ i32, i32 }) align 4 %agg.result28