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// RUN: %clang_cc1 -std=c++26 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
namespace std {
using size_t = decltype(sizeof(0));
template<typename> struct tuple_size;
template<size_t, typename> struct tuple_element;
}
struct Y { int n; };
struct X { X(); X(Y); X(const X&); ~X(); };
struct A { int a : 13; bool b; };
struct B {};
template<> struct std::tuple_size<B> { enum { value = 2 }; };
template<> struct std::tuple_element<0,B> { using type = X; };
template<> struct std::tuple_element<1,B> { using type = const int&; };
template<int N> auto get(B) {
if constexpr (N == 0)
return Y();
else
return 0.0;
}
using C = int[2];
template<typename T> T &make();
// CHECK-LABEL: define {{.*}} @_Z8big_testIiEiv()
template <typename T>
int big_test() {
A& a = make<A>();
A:
auto &[...an] = a;
an...[0] = 5;
// CHECK: %[[a1:.*]].load = load i16, ptr %[[BITFIELD:.*]],
// CHECK: %[[a1]].clear = and i16 %[[a1]].load, -8192
// CHECK: %[[a1]].set = or i16 %[[a1]].clear, 5
// CHECK: store i16 %[[a1]].set, ptr %[[BITFIELD]],
B:
auto [b1, ...bn] = make<B>();
// CHECK: @_Z4makeI1BERT_v()
// CHECK: call i32 @_Z3getILi0EEDa1B()
// CHECK: call void @_ZN1XC1E1Y(ptr {{[^,]*}} %[[b1:.*]], i32
//
// CHECK: call noundef double @_Z3getILi1EEDa1B()
// CHECK: %[[cvt:.*]] = fptosi double %{{.*}} to i32
// CHECK: store i32 %[[cvt]], ptr %[[b2:.*]],
// CHECK: store ptr %[[b2]], ptr %[[b2ref:.*]],
int bn2 = bn...[0];
// CHECK load ptr, ptr %[[b2ref]]
return 0;
}
int g = big_test<int>();
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