87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -verify -std=c++17 -Wno-bitfield-width %s
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// expected-no-diagnostics
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static_assert(__has_unique_object_representations(_BitInt(8)));
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static_assert(__has_unique_object_representations(unsigned _BitInt(8)));
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static_assert(__has_unique_object_representations(_BitInt(sizeof(int) * 8u)));
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// sizeof(_BitInt(24)) may be 4 to align it to the next greater integer type, in which case it would have 8 padding bits.
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static_assert(__has_unique_object_representations(_BitInt(24)) == (sizeof(_BitInt(24)) == 3));
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static_assert(!__has_unique_object_representations(_BitInt(7)));
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static_assert(!__has_unique_object_representations(unsigned _BitInt(7)));
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static_assert(!__has_unique_object_representations(_BitInt(2)));
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static_assert(!__has_unique_object_representations(unsigned _BitInt(1)));
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template <unsigned N>
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constexpr bool check() {
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if constexpr (N <= __BITINT_MAXWIDTH__) {
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static_assert(__has_unique_object_representations(_BitInt(N)) == (sizeof(_BitInt(N)) * 8u == N));
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static_assert(__has_unique_object_representations(unsigned _BitInt(N)) == (sizeof(unsigned _BitInt(N)) * 8u == N));
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}
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return true;
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}
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template <unsigned... N>
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constexpr bool do_check = (check<N>() && ...);
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static_assert(do_check<2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18>);
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static_assert(do_check<15, 16, 17, 23, 24, 25, 31, 32, 33>);
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static_assert(do_check<39, 40, 41, 47, 48, 49>);
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static_assert(do_check<127, 128, 129, 255, 256, 257, 383, 384, 385>);
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template <unsigned N>
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struct in_struct {
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_BitInt(N) x;
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static constexpr bool check() {
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return __has_unique_object_representations(in_struct<N>) == __has_unique_object_representations(_BitInt(N));
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}
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};
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static_assert(in_struct<8>::check());
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static_assert(in_struct<7>::check());
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struct bit_fields_1 {
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_BitInt(7) x : 7;
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unsigned _BitInt(1) y : 1;
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};
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static_assert(__has_unique_object_representations(bit_fields_1) == (sizeof(bit_fields_1) == 1));
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struct bit_fields_2 {
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_BitInt(8) x : 7;
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};
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static_assert(!__has_unique_object_representations(bit_fields_2));
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struct bit_fields_3 {
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_BitInt(15) x : 8;
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};
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static_assert(__has_unique_object_representations(bit_fields_3) == (sizeof(bit_fields_3) == 1));
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#if __BITINT_MAXWIDTH__ >= 129
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struct bit_fields_4 {
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_BitInt(129) x : 128;
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};
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static_assert(__has_unique_object_representations(bit_fields_4) == (sizeof(bit_fields_4) == 128 / 8));
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#endif
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struct bit_fields_5 {
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_BitInt(2) x : 8;
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};
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static_assert(!__has_unique_object_representations(bit_fields_5));
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template <unsigned N>
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struct ref_member {
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_BitInt(N) & x;
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};
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struct int_ref_member {
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int &x;
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};
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static_assert(__has_unique_object_representations(ref_member<7>) == __has_unique_object_representations(ref_member<8>));
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static_assert(__has_unique_object_representations(ref_member<8>) == __has_unique_object_representations(int_ref_member));
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