| //===----------------------------------------------------------------------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| // Test the __XXXX routines in the <bit> header. |
| // These are not supposed to be exhaustive tests, just sanity checks. |
| |
| #include <bit> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| int main(int, char **) |
| { |
| |
| |
| #if TEST_STD_VER > 11 |
| { |
| constexpr unsigned v = 0x1237U; |
| |
| // These are all constexpr in C++14 and later |
| static_assert( std::__rotl(v, 4) == 0x00012370, ""); |
| static_assert( std::__rotr(v, 4) == 0x70000123, ""); |
| static_assert( std::__countl_one(v) == 0, ""); |
| static_assert( std::__countr_one(v) == 3, ""); |
| static_assert( std::__countl_zero(v) == 19, ""); |
| static_assert( std::__countr_zero(v) == 0, ""); |
| |
| static_assert( std::__libcpp_popcount(v) == 7, ""); |
| static_assert( std::__bit_log2(v) == 12, ""); |
| static_assert(!std::__ispow2(v), ""); |
| } |
| #endif |
| |
| { |
| const unsigned v = 0x12345678; |
| |
| ASSERT_SAME_TYPE(unsigned, decltype(std::__rotl(v, 3))); |
| ASSERT_SAME_TYPE(unsigned, decltype(std::__rotr(v, 3))); |
| |
| ASSERT_SAME_TYPE(int, decltype(std::__countl_one(v))); |
| ASSERT_SAME_TYPE(int, decltype(std::__countr_one(v))); |
| ASSERT_SAME_TYPE(int, decltype(std::__countl_zero(v))); |
| ASSERT_SAME_TYPE(int, decltype(std::__countr_zero(v))); |
| |
| ASSERT_SAME_TYPE(int, decltype(std::__libcpp_popcount(v))); |
| ASSERT_SAME_TYPE(unsigned, decltype(std::__bit_log2(v))); |
| ASSERT_SAME_TYPE(bool, decltype(std::__ispow2(v))); |
| |
| |
| assert( std::__rotl(v, 3) == 0x91a2b3c0U); |
| assert( std::__rotr(v, 3) == 0x02468acfU); |
| |
| assert( std::__countl_one(v) == 0); |
| assert( std::__countr_one(v) == 0); |
| assert( std::__countl_zero(v) == 3); |
| assert( std::__countr_zero(v) == 3); |
| |
| assert( std::__libcpp_popcount(v) == 13); |
| assert( std::__bit_log2(v) == 28); |
| assert(!std::__ispow2(v)); |
| } |
| |
| return 0; |
| } |
| |