170 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// template <class T>12// constexpr int rotl(T x, unsigned int s) noexcept;13 14// Constraints: T is an unsigned integer type15 16#include <bit>17#include <cassert>18#include <cstddef>19#include <cstdint>20#include <limits>21#include <type_traits>22 23#include "test_macros.h"24 25struct A {};26enum E1 : unsigned char { rEd };27enum class E2 : unsigned char { red };28 29template <class T>30constexpr bool test()31{32 ASSERT_SAME_TYPE(decltype(std::rotl(T(), 0)), T);33 ASSERT_NOEXCEPT(std::rotl(T(), 0));34 T max = std::numeric_limits<T>::max();35 T highbit = std::rotr(T(1), 1);36 37 assert(std::rotl(T(max - 1), 0) == T(max - 1));38 assert(std::rotl(T(max - 1), 1) == T(max - 2));39 assert(std::rotl(T(max - 1), 2) == T(max - 4));40 assert(std::rotl(T(max - 1), 3) == T(max - 8));41 assert(std::rotl(T(max - 1), 4) == T(max - 16));42 assert(std::rotl(T(max - 1), 5) == T(max - 32));43 assert(std::rotl(T(max - 1), 6) == T(max - 64));44 assert(std::rotl(T(max - 1), 7) == T(max - 128));45 assert(std::rotl(T(max - 1), std::numeric_limits<int>::max()) ==46 std::rotl(T(max - 1), std::numeric_limits<int>::max() % std::numeric_limits<T>::digits));47 48 assert(std::rotl(T(max - 1), -1) == T(max - highbit));49 assert(std::rotl(T(max - 1), -2) == T(max - (highbit >> 1)));50 assert(std::rotl(T(max - 1), -3) == T(max - (highbit >> 2)));51 assert(std::rotl(T(max - 1), -4) == T(max - (highbit >> 3)));52 assert(std::rotl(T(max - 1), -5) == T(max - (highbit >> 4)));53 assert(std::rotl(T(max - 1), -6) == T(max - (highbit >> 5)));54 assert(std::rotl(T(max - 1), -7) == T(max - (highbit >> 6)));55 assert(std::rotl(T(max - 1), std::numeric_limits<int>::min()) ==56 std::rotl(T(max - 1), std::numeric_limits<int>::min() % std::numeric_limits<T>::digits));57 58 assert(std::rotl(T(1), 0) == T(1));59 assert(std::rotl(T(1), 1) == T(2));60 assert(std::rotl(T(1), 2) == T(4));61 assert(std::rotl(T(1), 3) == T(8));62 assert(std::rotl(T(1), 4) == T(16));63 assert(std::rotl(T(1), 5) == T(32));64 assert(std::rotl(T(1), 6) == T(64));65 assert(std::rotl(T(1), 7) == T(128));66 67 assert(std::rotl(T(128), -1) == T(64));68 assert(std::rotl(T(128), -2) == T(32));69 assert(std::rotl(T(128), -3) == T(16));70 assert(std::rotl(T(128), -4) == T(8));71 assert(std::rotl(T(128), -5) == T(4));72 assert(std::rotl(T(128), -6) == T(2));73 assert(std::rotl(T(128), -7) == T(1));74 75#ifndef TEST_HAS_NO_INT12876 if constexpr (std::is_same_v<T, __uint128_t>) {77 T val = (T(1) << 63) | (T(1) << 64);78 assert(std::rotl(val, 0) == val);79 assert(std::rotl(val, 128) == val);80 assert(std::rotl(val, 256) == val);81 assert(std::rotl(val, 1) == val << 1);82 assert(std::rotl(val, 127) == val >> 1);83 assert(std::rotl(T(3), 127) == ((T(1) << 127) | T(1)));84 85 assert(std::rotl(val, -128) == val);86 assert(std::rotl(val, -256) == val);87 assert(std::rotl(val, -1) == val >> 1);88 assert(std::rotl(val, -127) == val << 1);89 assert(std::rotl(T(3), -1) == ((T(1) << 127) | T(1)));90 }91#endif92 93 return true;94}95 96int main(int, char**)97{98 {99 auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};100 using L = decltype(lambda);101 102 static_assert(!std::is_invocable_v<L, signed char>);103 static_assert(!std::is_invocable_v<L, short>);104 static_assert(!std::is_invocable_v<L, int>);105 static_assert(!std::is_invocable_v<L, long>);106 static_assert(!std::is_invocable_v<L, long long>);107#ifndef TEST_HAS_NO_INT128108 static_assert(!std::is_invocable_v<L, __int128_t>);109#endif110 111 static_assert(!std::is_invocable_v<L, std::int8_t>);112 static_assert(!std::is_invocable_v<L, std::int16_t>);113 static_assert(!std::is_invocable_v<L, std::int32_t>);114 static_assert(!std::is_invocable_v<L, std::int64_t>);115 static_assert(!std::is_invocable_v<L, std::intmax_t>);116 static_assert(!std::is_invocable_v<L, std::intptr_t>);117 static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);118 119 static_assert(!std::is_invocable_v<L, bool>);120 static_assert(!std::is_invocable_v<L, char>);121 static_assert(!std::is_invocable_v<L, wchar_t>);122#ifndef TEST_HAS_NO_CHAR8_T123 static_assert(!std::is_invocable_v<L, char8_t>);124#endif125 static_assert(!std::is_invocable_v<L, char16_t>);126 static_assert(!std::is_invocable_v<L, char32_t>);127 128 static_assert(!std::is_invocable_v<L, A>);129 static_assert(!std::is_invocable_v<L, A*>);130 static_assert(!std::is_invocable_v<L, E1>);131 static_assert(!std::is_invocable_v<L, E2>);132 }133 134 static_assert(test<unsigned char>());135 static_assert(test<unsigned short>());136 static_assert(test<unsigned int>());137 static_assert(test<unsigned long>());138 static_assert(test<unsigned long long>());139#ifndef TEST_HAS_NO_INT128140 static_assert(test<__uint128_t>());141#endif142 143 static_assert(test<std::uint8_t>());144 static_assert(test<std::uint16_t>());145 static_assert(test<std::uint32_t>());146 static_assert(test<std::uint64_t>());147 static_assert(test<std::uintmax_t>());148 static_assert(test<std::uintptr_t>());149 static_assert(test<std::size_t>());150 151 test<unsigned char>();152 test<unsigned short>();153 test<unsigned int>();154 test<unsigned long>();155 test<unsigned long long>();156#ifndef TEST_HAS_NO_INT128157 test<__uint128_t>();158#endif159 160 test<std::uint8_t>();161 test<std::uint16_t>();162 test<std::uint32_t>();163 test<std::uint64_t>();164 test<std::uintmax_t>();165 test<std::uintptr_t>();166 test<std::size_t>();167 168 return 0;169}170