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// benchmark.cpp ---------------------------------------------------------------------//
// Copyright Beman Dawes 2011
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
#ifndef _SCL_SECURE_NO_WARNINGS
# define _SCL_SECURE_NO_WARNINGS
#endif
#ifndef _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_WARNINGS
#endif
#include <cstdlib>
#include <boost/endian/conversion.hpp>
#include <boost/random.hpp>
#include <boost/cstdint.hpp>
#include <boost/timer/timer.hpp>
#include <iostream>
#include <string>
using namespace boost;
using std::cout;
using std::cerr;
using std::endl;
using std::vector;
namespace
{
std::string command_args;
long long n_cases;
int places = 2;
bool verbose (false);
#ifndef BOOST_TWO_ARG
typedef int32_t (*timee_func)(int32_t);
#else
typedef void (*timee_func)(int32_t, int32_t&);
#endif
typedef boost::timer::nanosecond_type nanosecond_t;
//--------------------------------------------------------------------------------------//
nanosecond_t benchmark(timee_func timee, const char* msg,
nanosecond_t overhead = 0)
// Returns: total cpu time (i.e. system time + user time)
{
if (verbose)
cout << "\nRunning benchmark..." << endl;
int64_t sum = 0;
boost::timer::cpu_times times;
nanosecond_t cpu_time;
boost::timer::auto_cpu_timer t(places);
for (long long i = n_cases; i; --i)
{
# ifndef BOOST_TWO_ARG
sum += timee(static_cast<int32_t>(i)) ;
# else
int32_t y;
timee(static_cast<int32_t>(i), y);
sum += y;
# endif
}
t.stop();
times = t.elapsed();
cpu_time = (times.system + times.user) - overhead;
const long double sec = 1000000000.0L;
cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
cout.precision(places);
cout << msg << " " << cpu_time / sec << endl;
if (verbose)
{
t.report();
cout << " Benchmark complete\n"
" sum is " << sum << endl;
}
return cpu_time;
}
void process_command_line(int argc, char * argv[])
{
for (int a = 0; a < argc; ++a)
{
command_args += argv[a];
if (a != argc-1)
command_args += ' ';
}
cout << command_args << '\n';;
if (argc >=2)
#ifndef _MSC_VER
n_cases = std::atoll(argv[1]);
#else
n_cases = _atoi64(argv[1]);
#endif
for (; argc > 2; ++argv, --argc)
{
if ( *(argv[2]+1) == 'p' )
places = atoi( argv[2]+2 );
else if ( *(argv[2]+1) == 'v' )
verbose = true;
else
{
cout << "Error - unknown option: " << argv[2] << "\n\n";
argc = -1;
break;
}
}
if (argc < 2)
{
cout << "Usage: benchmark n [Options]\n"
" The argument n specifies the number of test cases to run\n"
" Options:\n"
" -v Verbose messages\n"
" -p# Decimal places for times; default -p" << places << "\n";
return std::exit(1);
}
}
inline void inplace(int32_t& x)
{
x = (static_cast<uint32_t>(x) << 24)
| ((static_cast<uint32_t>(x) << 8) & 0x00ff0000)
| ((static_cast<uint32_t>(x) >> 8) & 0x0000ff00)
| (static_cast<uint32_t>(x) >> 24);
}
inline int32_t by_return(int32_t x)
{
return (static_cast<uint32_t>(x) << 24)
| ((static_cast<uint32_t>(x) << 8) & 0x00ff0000)
| ((static_cast<uint32_t>(x) >> 8) & 0x0000ff00)
| (static_cast<uint32_t>(x) >> 24);
}
inline int32_t by_return_intrinsic(int32_t x)
{
return BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_4(static_cast<uint32_t>(x));
}
inline int32_t by_return_pyry(int32_t x)
{
uint32_t step16;
step16 = static_cast<uint32_t>(x) << 16 | static_cast<uint32_t>(x) >> 16;
return
((static_cast<uint32_t>(step16) << 8) & 0xff00ff00)
| ((static_cast<uint32_t>(step16) >> 8) & 0x00ff00ff);
}
inline int32_t two_operand(int32_t x, int32_t& y)
{
return y = ((x << 24) & 0xff000000) | ((x << 8) & 0x00ff0000) | ((x >> 24) & 0x000000ff)
| ((x >> 8) & 0x0000ff00);
}
inline int32_t modify_noop(int32_t x)
{
int32_t v(x);
return v;
}
inline int32_t modify_inplace(int32_t x)
{
int32_t v(x);
inplace(v);
return v;
}
inline int32_t modify_by_return(int32_t x)
{
int32_t v(x);
return by_return(v);
}
inline int32_t modify_by_return_pyry(int32_t x)
{
int32_t v(x);
return by_return_pyry(v);
}
inline int32_t modify_by_return_intrinsic(int32_t x)
{
int32_t v(x);
return by_return_intrinsic(v);
}
inline void non_modify_assign(int32_t x, int32_t& y)
{
y = x;
}
inline void non_modify_two_operand(int32_t x, int32_t& y)
{
two_operand(x, y);
}
inline void non_modify_by_return(int32_t x, int32_t& y)
{
y = by_return(x);
}
} // unnamed namespace
//-------------------------------------- main() ---------------------------------------//
int main(int argc, char * argv[])
{
process_command_line(argc, argv);
nanosecond_t overhead;
#ifndef BOOST_TWO_ARG
overhead = benchmark(modify_noop, "modify no-op");
benchmark(modify_inplace, "modify in place"/*, overhead*/);
benchmark(modify_by_return, "modify by return"/*, overhead*/);
benchmark(modify_by_return_pyry, "modify by return_pyry"/*, overhead*/);
benchmark(modify_by_return_intrinsic, "modify by return_intrinsic"/*, overhead*/);
#else
overhead = benchmark(non_modify_assign, "non_modify_assign ");
benchmark(non_modify_two_operand, "non_modify_two_operand", overhead);
benchmark(non_modify_by_return, "non_modify_by_return ", overhead);
#endif
return 0;
}
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