From a5c3485a583951c78332c03cc140387d3567a8a7 Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Mon, 1 Jul 2019 23:00:32 +0000
Subject: Bit Operations: P0556, P0553 and P1355. Reviewed as:
 https://reviews.llvm.org/D51262

llvm-svn: 364862
---
 .../numerics/bit/bitops.count/countl_one.pass.cpp  | 165 +++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp

(limited to 'libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp')

diff --git a/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp b/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp
new file mode 100644
index 00000000000..28cb52545c0
--- /dev/null
+++ b/libcxx/test/std/numerics/bit/bitops.count/countl_one.pass.cpp
@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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 countl_one(T x) noexcept;
+
+// The number of consecutive 1 bits, starting from the most significant bit.
+//   [ Note: Returns N if x == std::numeric_limits<T>::max(). ]
+//
+// 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 int dig = std::numeric_limits<T>::digits;
+	const T max   = std::numeric_limits<T>::max();
+	return std::countl_one(max) == dig
+	   &&  std::countl_one(T(max - 1)) == dig - 1
+	   &&  std::countl_one(T(max - 2)) == dig - 2
+	   &&  std::countl_one(T(max - 3)) == dig - 2
+	   &&  std::countl_one(T(max - 4)) == dig - 3
+	   &&  std::countl_one(T(max - 5)) == dig - 3
+	   &&  std::countl_one(T(max - 6)) == dig - 3
+	   &&  std::countl_one(T(max - 7)) == dig - 3
+	   &&  std::countl_one(T(max - 8)) == dig - 4
+	   &&  std::countl_one(T(max - 9)) == dig - 4
+	  ;
+}
+
+
+template <typename T>
+void runtime_test()
+{
+	ASSERT_SAME_TYPE(int, decltype(std::countl_one(T(0))));
+	ASSERT_NOEXCEPT(               std::countl_one(T(0)));
+	const int dig = std::numeric_limits<T>::digits;
+	
+	assert( std::countl_one(T(~121)) == dig - 7);
+	assert( std::countl_one(T(~122)) == dig - 7);
+	assert( std::countl_one(T(~123)) == dig - 7);
+	assert( std::countl_one(T(~124)) == dig - 7);
+	assert( std::countl_one(T(~125)) == dig - 7);
+	assert( std::countl_one(T(~126)) == dig - 7);
+	assert( std::countl_one(T(~127)) == dig - 7);
+	assert( std::countl_one(T(~128)) == dig - 8);
+	assert( std::countl_one(T(~129)) == dig - 8);
+	assert( std::countl_one(T(~130)) == dig - 8);
+}
+
+int main()
+{
+	{
+    auto lambda = [](auto x) -> decltype(std::countl_one(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>();
+
+	{
+	const int dig = std::numeric_limits<__uint128_t>::digits;
+	__uint128_t val = 128;
+
+	val <<= 32;
+	assert( std::countl_one(~val)   == dig - 40);
+	val <<= 2;
+	assert( std::countl_one(~val)   == dig - 42);
+	val <<= 3;
+	assert( std::countl_one(~val)   == dig - 45);
+	}
+#endif
+
+}
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