Bit Operations: P0556, P0553 and P1355. Reviewed as: https://reviews.llvm.org/D51262
llvm-svn: 364862
diff --git a/libcxx/test/std/numerics/bit/bit.pow.two/log2p1.pass.cpp b/libcxx/test/std/numerics/bit/bit.pow.two/log2p1.pass.cpp
new file mode 100644
index 0000000..39054bc
--- /dev/null
+++ b/libcxx/test/std/numerics/bit/bit.pow.two/log2p1.pass.cpp
@@ -0,0 +1,177 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 T log2p1(T x) noexcept;
+
+// If x == 0, 0; otherwise one plus the base-2 logarithm of x, with any fractional part discarded.
+
+// Remarks: This function shall not participate in overload resolution unless
+// T is an unsigned integer type
+
+#include <bit>
+#include <cstdint>
+#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()
+{
+ return std::log2p1(T(0)) == T(0)
+ && std::log2p1(T(1)) == T(1)
+ && std::log2p1(T(2)) == T(2)
+ && std::log2p1(T(3)) == T(2)
+ && std::log2p1(T(4)) == T(3)
+ && std::log2p1(T(5)) == T(3)
+ && std::log2p1(T(6)) == T(3)
+ && std::log2p1(T(7)) == T(3)
+ && std::log2p1(T(8)) == T(4)
+ && std::log2p1(T(9)) == T(4)
+ ;
+}
+
+
+template <typename T>
+void runtime_test()
+{
+ ASSERT_SAME_TYPE(T, decltype(std::log2p1(T(0))));
+ ASSERT_NOEXCEPT( std::log2p1(T(0)));
+
+ assert( std::log2p1(T(0)) == T(0));
+ assert( std::log2p1(T(1)) == T(1));
+ assert( std::log2p1(T(2)) == T(2));
+ assert( std::log2p1(T(3)) == T(2));
+ assert( std::log2p1(T(4)) == T(3));
+ assert( std::log2p1(T(5)) == T(3));
+ assert( std::log2p1(T(6)) == T(3));
+ assert( std::log2p1(T(7)) == T(3));
+ assert( std::log2p1(T(8)) == T(4));
+ assert( std::log2p1(T(9)) == T(4));
+
+
+ assert( std::log2p1(T(121)) == T(7));
+ assert( std::log2p1(T(122)) == T(7));
+ assert( std::log2p1(T(123)) == T(7));
+ assert( std::log2p1(T(124)) == T(7));
+ assert( std::log2p1(T(125)) == T(7));
+ assert( std::log2p1(T(126)) == T(7));
+ assert( std::log2p1(T(127)) == T(7));
+ assert( std::log2p1(T(128)) == T(8));
+ assert( std::log2p1(T(129)) == T(8));
+ assert( std::log2p1(T(130)) == T(8));
+}
+
+int main()
+{
+
+ {
+ auto lambda = [](auto x) -> decltype(std::log2p1(x)) {};
+ 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>();
+ runtime_test<unsigned short>();
+ 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 = 128;
+ val <<= 32;
+ assert( std::log2p1(val-1) == 39);
+ assert( std::log2p1(val) == 40);
+ assert( std::log2p1(val+1) == 40);
+ val <<= 2;
+ assert( std::log2p1(val-1) == 41);
+ assert( std::log2p1(val) == 42);
+ assert( std::log2p1(val+1) == 42);
+ val <<= 3;
+ assert( std::log2p1(val-1) == 44);
+ assert( std::log2p1(val) == 45);
+ assert( std::log2p1(val+1) == 45);
+ }
+#endif
+
+}