164 lines
5.5 KiB
C++
164 lines
5.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// template <class T>
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// constexpr int rotr(T x, unsigned int s) noexcept;
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// Constraints: T is an unsigned integer type
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#include <bit>
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#include <cassert>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include "test_macros.h"
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struct A {};
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enum E1 : unsigned char { rEd };
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enum class E2 : unsigned char { red };
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template <class T>
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constexpr bool test()
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{
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ASSERT_SAME_TYPE(decltype(std::rotr(T(), 0)), T);
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ASSERT_NOEXCEPT(std::rotr(T(), 0));
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T max = std::numeric_limits<T>::max();
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T highbit = std::rotr(T(1), 1);
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assert(std::rotr(T(max - 1), 0) == T(max - 1));
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assert(std::rotr(T(max - 1), 1) == T(max - highbit));
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assert(std::rotr(T(max - 1), 2) == T(max - (highbit >> 1)));
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assert(std::rotr(T(max - 1), 3) == T(max - (highbit >> 2)));
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assert(std::rotr(T(max - 1), 4) == T(max - (highbit >> 3)));
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assert(std::rotr(T(max - 1), 5) == T(max - (highbit >> 4)));
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assert(std::rotr(T(max - 1), 6) == T(max - (highbit >> 5)));
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assert(std::rotr(T(max - 1), 7) == T(max - (highbit >> 6)));
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assert(std::rotr(T(max - 1), -1) == T(max - 2));
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assert(std::rotr(T(max - 1), -2) == T(max - 4));
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assert(std::rotr(T(max - 1), -3) == T(max - 8));
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assert(std::rotr(T(max - 1), -4) == T(max - 16));
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assert(std::rotr(T(max - 1), -5) == T(max - 32));
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assert(std::rotr(T(max - 1), -6) == T(max - 64));
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assert(std::rotr(T(max - 1), -7) == T(max - 128));
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assert(std::rotr(T(128), 0) == T(128));
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assert(std::rotr(T(128), 1) == T(64));
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assert(std::rotr(T(128), 2) == T(32));
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assert(std::rotr(T(128), 3) == T(16));
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assert(std::rotr(T(128), 4) == T(8));
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assert(std::rotr(T(128), 5) == T(4));
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assert(std::rotr(T(128), 6) == T(2));
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assert(std::rotr(T(128), 7) == T(1));
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assert(std::rotr(T(1), -1) == T(2));
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assert(std::rotr(T(1), -2) == T(4));
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assert(std::rotr(T(1), -3) == T(8));
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assert(std::rotr(T(1), -4) == T(16));
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assert(std::rotr(T(1), -5) == T(32));
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assert(std::rotr(T(1), -6) == T(64));
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assert(std::rotr(T(1), -7) == T(128));
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#ifndef TEST_HAS_NO_INT128
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if constexpr (std::is_same_v<T, __uint128_t>) {
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T val = (T(1) << 63) | (T(1) << 64);
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assert(std::rotr(val, 0) == val);
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assert(std::rotr(val, 128) == val);
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assert(std::rotr(val, 256) == val);
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assert(std::rotr(val, 1) == val >> 1);
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assert(std::rotr(val, 127) == val << 1);
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assert(std::rotr(T(3), 1) == ((T(1) << 127) | T(1)));
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assert(std::rotr(val, -128) == val);
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assert(std::rotr(val, -256) == val);
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assert(std::rotr(val, -1) == val << 1);
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assert(std::rotr(val, -127) == val >> 1);
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assert(std::rotr(T(3), -127) == ((T(1) << 127) | T(1)));
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}
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#endif
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return true;
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}
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int main(int, char**)
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{
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{
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auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
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using L = decltype(lambda);
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static_assert(!std::is_invocable_v<L, signed char>);
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static_assert(!std::is_invocable_v<L, short>);
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static_assert(!std::is_invocable_v<L, int>);
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static_assert(!std::is_invocable_v<L, long>);
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static_assert(!std::is_invocable_v<L, long long>);
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#ifndef TEST_HAS_NO_INT128
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static_assert(!std::is_invocable_v<L, __int128_t>);
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#endif
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static_assert(!std::is_invocable_v<L, std::int8_t>);
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static_assert(!std::is_invocable_v<L, std::int16_t>);
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static_assert(!std::is_invocable_v<L, std::int32_t>);
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static_assert(!std::is_invocable_v<L, std::int64_t>);
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static_assert(!std::is_invocable_v<L, std::intmax_t>);
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static_assert(!std::is_invocable_v<L, std::intptr_t>);
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static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
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static_assert(!std::is_invocable_v<L, bool>);
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static_assert(!std::is_invocable_v<L, char>);
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static_assert(!std::is_invocable_v<L, wchar_t>);
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#ifndef TEST_HAS_NO_CHAR8_T
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static_assert(!std::is_invocable_v<L, char8_t>);
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#endif
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static_assert(!std::is_invocable_v<L, char16_t>);
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static_assert(!std::is_invocable_v<L, char32_t>);
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static_assert(!std::is_invocable_v<L, A>);
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static_assert(!std::is_invocable_v<L, A*>);
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static_assert(!std::is_invocable_v<L, E1>);
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static_assert(!std::is_invocable_v<L, E2>);
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}
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static_assert(test<unsigned char>());
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static_assert(test<unsigned short>());
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static_assert(test<unsigned int>());
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static_assert(test<unsigned long>());
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static_assert(test<unsigned long long>());
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#ifndef TEST_HAS_NO_INT128
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static_assert(test<__uint128_t>());
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#endif
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static_assert(test<std::uint8_t>());
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static_assert(test<std::uint16_t>());
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static_assert(test<std::uint32_t>());
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static_assert(test<std::uint64_t>());
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static_assert(test<std::uintmax_t>());
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static_assert(test<std::uintptr_t>());
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static_assert(test<std::size_t>());
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test<unsigned char>();
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test<unsigned short>();
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test<unsigned int>();
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test<unsigned long>();
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test<unsigned long long>();
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#ifndef TEST_HAS_NO_INT128
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test<__uint128_t>();
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#endif
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test<std::uint8_t>();
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test<std::uint16_t>();
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test<std::uint32_t>();
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test<std::uint64_t>();
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test<std::uintmax_t>();
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test<std::uintptr_t>();
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test<std::size_t>();
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return 0;
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}
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