rotl.pass.cpp
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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// template <class T>
// constexpr int rotl(T x, unsigned int s) noexcept;
// Remarks: This function shall not participate in overload resolution unless
// T is an unsigned integer type
#include <bit>
#include <cstdint>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
class A{};
enum E1 : unsigned char { rEd };
enum class E2 : unsigned char { red };
template <typename T>
constexpr bool constexpr_test()
{
const T max = std::numeric_limits<T>::max();
return std::rotl(T(1), 0) == T( 1)
&& std::rotl(T(1), 1) == T( 2)
&& std::rotl(T(1), 2) == T( 4)
&& std::rotl(T(1), 3) == T( 8)
&& std::rotl(T(1), 4) == T( 16)
&& std::rotl(T(1), 5) == T( 32)
&& std::rotl(T(1), 6) == T( 64)
&& std::rotl(T(1), 7) == T(128)
&& std::rotl(max, 0) == max
&& std::rotl(max, 1) == max
&& std::rotl(max, 2) == max
&& std::rotl(max, 3) == max
&& std::rotl(max, 4) == max
&& std::rotl(max, 5) == max
&& std::rotl(max, 6) == max
&& std::rotl(max, 7) == max
;
}
template <typename T>
void runtime_test()
{
ASSERT_SAME_TYPE(T, decltype(std::rotl(T(0), 0)));
ASSERT_NOEXCEPT( std::rotl(T(0), 0));
const T val = std::numeric_limits<T>::max() - 1;
assert( std::rotl(val, 0) == val);
assert( std::rotl(val, 1) == T((val << 1) + 1));
assert( std::rotl(val, 2) == T((val << 2) + 3));
assert( std::rotl(val, 3) == T((val << 3) + 7));
assert( std::rotl(val, 4) == T((val << 4) + 15));
assert( std::rotl(val, 5) == T((val << 5) + 31));
assert( std::rotl(val, 6) == T((val << 6) + 63));
assert( std::rotl(val, 7) == T((val << 7) + 127));
}
int main()
{
{
auto lambda = [](auto x) -> decltype(std::rotl(x, 1U)) {};
using L = decltype(lambda);
static_assert( std::is_invocable_v<L, unsigned char>, "");
static_assert( std::is_invocable_v<L, unsigned int>, "");
static_assert( std::is_invocable_v<L, unsigned long>, "");
static_assert( std::is_invocable_v<L, unsigned long long>, "");
static_assert( std::is_invocable_v<L, uint8_t>, "");
static_assert( std::is_invocable_v<L, uint16_t>, "");
static_assert( std::is_invocable_v<L, uint32_t>, "");
static_assert( std::is_invocable_v<L, uint64_t>, "");
static_assert( std::is_invocable_v<L, size_t>, "");
static_assert( std::is_invocable_v<L, uintmax_t>, "");
static_assert( std::is_invocable_v<L, uintptr_t>, "");
static_assert(!std::is_invocable_v<L, int>, "");
static_assert(!std::is_invocable_v<L, signed int>, "");
static_assert(!std::is_invocable_v<L, long>, "");
static_assert(!std::is_invocable_v<L, long long>, "");
static_assert(!std::is_invocable_v<L, int8_t>, "");
static_assert(!std::is_invocable_v<L, int16_t>, "");
static_assert(!std::is_invocable_v<L, int32_t>, "");
static_assert(!std::is_invocable_v<L, int64_t>, "");
static_assert(!std::is_invocable_v<L, ptrdiff_t>, "");
static_assert(!std::is_invocable_v<L, bool>, "");
static_assert(!std::is_invocable_v<L, signed char>, "");
static_assert(!std::is_invocable_v<L, char16_t>, "");
static_assert(!std::is_invocable_v<L, char32_t>, "");
#ifndef _LIBCPP_HAS_NO_INT128
static_assert( std::is_invocable_v<L, __uint128_t>, "");
static_assert(!std::is_invocable_v<L, __int128_t>, "");
#endif
static_assert(!std::is_invocable_v<L, A>, "");
static_assert(!std::is_invocable_v<L, E1>, "");
static_assert(!std::is_invocable_v<L, E2>, "");
}
static_assert(constexpr_test<unsigned char>(), "");
static_assert(constexpr_test<unsigned short>(), "");
static_assert(constexpr_test<unsigned>(), "");
static_assert(constexpr_test<unsigned long>(), "");
static_assert(constexpr_test<unsigned long long>(), "");
static_assert(constexpr_test<uint8_t>(), "");
static_assert(constexpr_test<uint16_t>(), "");
static_assert(constexpr_test<uint32_t>(), "");
static_assert(constexpr_test<uint64_t>(), "");
static_assert(constexpr_test<size_t>(), "");
static_assert(constexpr_test<uintmax_t>(), "");
static_assert(constexpr_test<uintptr_t>(), "");
#ifndef _LIBCPP_HAS_NO_INT128
static_assert(constexpr_test<__uint128_t>(), "");
#endif
runtime_test<unsigned char>();
runtime_test<unsigned short>();
runtime_test<unsigned>();
runtime_test<unsigned long>();
runtime_test<unsigned long long>();
runtime_test<uint8_t>();
runtime_test<uint16_t>();
runtime_test<uint32_t>();
runtime_test<uint64_t>();
runtime_test<size_t>();
runtime_test<uintmax_t>();
runtime_test<uintptr_t>();
#ifndef _LIBCPP_HAS_NO_INT128
runtime_test<__uint128_t>();
{
__uint128_t val = 168; // 0xA8 (aka 10101000)
assert( std::rotl(val, 128) == 168);
val <<= 32;
assert( std::rotl(val, 96) == 168);
val <<= 2;
assert( std::rotl(val, 95) == 336);
val <<= 3;
assert( std::rotl(val, 90) == 84);
assert( std::rotl(val, 218) == 84);
}
#endif
}