update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / core / test / bit_width_test.cpp

diff --git a/ceph/src/boost/libs/core/test/bit_width_test.cpp b/ceph/src/boost/libs/core/test/bit_width_test.cpp
new file mode 100644 (file)
index 0000000..15ac76d
--- /dev/null
+++ b/ceph/src/boost/libs/core/test/bit_width_test.cpp
@@ -0,0 +1,94 @@
+// Test for boost/core/bit.hpp (bit_width)
+//
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/bit.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/detail/splitmix64.hpp>
+#include <boost/cstdint.hpp>
+#include <limits>
+
+template<class T> void test_width( T x )
+{
+    BOOST_TEST_EQ( boost::core::bit_width( x ), std::numeric_limits<T>::digits - boost::core::countl_zero( x ) );
+}
+
+int main()
+{
+    {
+        boost::uint8_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 8; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint8_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint8_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint16_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 16; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint16_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint16_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint32_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 32; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint32_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint32_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    {
+        boost::uint64_t x = 0;
+
+        BOOST_TEST_EQ( boost::core::bit_width( x ), 0 );
+
+        x = 1;
+
+        for( int i = 0; i < 64; ++i, x <<= 1 )
+        {
+            BOOST_TEST_EQ( boost::core::bit_width( x ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint64_t>( x | ( x >> 1 ) ) ), i+1 );
+            BOOST_TEST_EQ( boost::core::bit_width( static_cast<boost::uint64_t>( x | ( x >> 2 ) ) ), i+1 );
+        }
+    }
+
+    boost::detail::splitmix64 rng;
+
+    for( int i = 0; i < 1000; ++i )
+    {
+        boost::uint64_t x = rng();
+
+        test_width( static_cast<unsigned char>( x ) );
+        test_width( static_cast<unsigned short>( x ) );
+        test_width( static_cast<unsigned int>( x ) );
+        test_width( static_cast<unsigned long>( x ) );
+        test_width( static_cast<boost::ulong_long_type>( x ) );
+    }
+
+    return boost::report_errors();
+}