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Add countr_zero, countr_one

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This commit is contained in:
Peter Dimov
2020-12-28 21:52:02 +02:00
parent 045487ba96
commit a47eebf41a
5 changed files with 114 additions and 4 deletions
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1
test/Jamfile.v2
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@@ -224,6 +224,7 @@ run cmath_test.cpp ;
run bit_cast_test.cpp ;
run bit_rotate_test.cpp ;
run bit_countr_test.cpp ;
use-project /boost/core/swap : ./swap ;
build-project ./swap ;

2
test/bit_cast_test.cpp
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@@ -1,4 +1,4 @@
// Test for boost/core/bit.hpp
// Test for boost/core/bit.hpp (bit_cast)
//
// Copyright 2020 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.

46
test/bit_countr_test.cpp Normal file
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@@ -0,0 +1,46 @@
// Test for boost/core/bit.hpp (countr_zero, countr_one)
//
// 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_countr( T x )
{
x |= 1;
for( int i = 0; i <= std::numeric_limits<T>::digits; ++i, x <<= 1 )
{
BOOST_TEST_EQ( boost::core::countr_zero( x ), i );
BOOST_TEST_EQ( boost::core::countr_one( static_cast<T>( ~x ) ), i );
}
}
int main()
{
test_countr( static_cast<unsigned char>( 0 ) );
test_countr( static_cast<unsigned short>( 0 ) );
test_countr( static_cast<unsigned int>( 0 ) );
test_countr( static_cast<unsigned long>( 0 ) );
test_countr( static_cast<unsigned long long>( 0 ) );
boost::detail::splitmix64 rng;
for( int i = 0; i < 1000; ++i )
{
boost::uint64_t x = rng();
test_countr( static_cast<unsigned char>( x ) );
test_countr( static_cast<unsigned short>( x ) );
test_countr( static_cast<unsigned int>( x ) );
test_countr( static_cast<unsigned long>( x ) );
test_countr( static_cast<unsigned long long>( x ) );
}
return boost::report_errors();
}

2
test/bit_rotate_test.cpp
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@@ -1,4 +1,4 @@
// Test for boost/core/bit.hpp
// Test for boost/core/bit.hpp (rotl, rotr)
//
// Copyright 2020 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.