test_gamma.cpp

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//  Copyright John Maddock 2007.
//  Use, modification and distribution are subject to the
//  Boost Software License, Version 1.0. (See accompanying file
//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include "required_defines.hpp"

#include "performance_measure.hpp"

#include <boost/math/special_functions/gamma.hpp>
#include <boost/array.hpp>

#define T double
#include "../test/test_gamma_data.ipp"

template <std::size_t N>
double gamma_evaluate2(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += boost::math::tgamma(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(gamma_test, "gamma")
{
   double result = gamma_evaluate2(factorials);
   result += gamma_evaluate2(near_1);
   result += gamma_evaluate2(near_2);
   result += gamma_evaluate2(near_0);
   result += gamma_evaluate2(near_m10);
   result += gamma_evaluate2(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

template <std::size_t N>
double lgamma_evaluate2(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += boost::math::lgamma(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(lgamma_test, "lgamma")
{
   double result = lgamma_evaluate2(factorials);
   result += lgamma_evaluate2(near_1);
   result += lgamma_evaluate2(near_2);
   result += lgamma_evaluate2(near_0);
   result += lgamma_evaluate2(near_m10);
   result += lgamma_evaluate2(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

#ifdef TEST_CEPHES

extern "C" {

double gamma(double);
double lgam(double);

}

template <std::size_t N>
double gamma_evaluate_cephes(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += gamma(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(gamma_test, "gamma-cephes")
{
   double result = gamma_evaluate_cephes(factorials);
   result += gamma_evaluate_cephes(near_1);
   result += gamma_evaluate_cephes(near_2);
   result += gamma_evaluate_cephes(near_0);
   result += gamma_evaluate_cephes(near_m10);
   result += gamma_evaluate_cephes(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

template <std::size_t N>
double lgamma_evaluate_cephes(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += lgam(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(lgamma_test, "lgamma-cephes")
{
   double result = lgamma_evaluate_cephes(factorials);
   result += lgamma_evaluate_cephes(near_1);
   result += lgamma_evaluate_cephes(near_2);
   result += lgamma_evaluate_cephes(near_0);
   result += lgamma_evaluate_cephes(near_m10);
   result += lgamma_evaluate_cephes(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

#endif

#ifdef TEST_GSL

#include <gsl/gsl_sf_gamma.h>

template <std::size_t N>
double gamma_evaluate_gsl(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += gsl_sf_gamma(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(gamma_test, "gamma-gsl")
{
   double result = gamma_evaluate_gsl(factorials);
   result += gamma_evaluate_gsl(near_1);
   result += gamma_evaluate_gsl(near_2);
   result += gamma_evaluate_gsl(near_0);
   result += gamma_evaluate_gsl(near_m10);
   result += gamma_evaluate_gsl(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

template <std::size_t N>
double lgamma_evaluate_gsl(const boost::array<boost::array<T, 3>, N>& data)
{
   double result = 0;
   for(unsigned i = 0; i < N; ++i)
      result += gsl_sf_lngamma(data[i][0]);
   return result;
}

BOOST_MATH_PERFORMANCE_TEST(lgamma_test, "lgamma-gsl")
{
   double result = lgamma_evaluate_gsl(factorials);
   result += lgamma_evaluate_gsl(near_1);
   result += lgamma_evaluate_gsl(near_2);
   result += lgamma_evaluate_gsl(near_0);
   result += lgamma_evaluate_gsl(near_m10);
   result += lgamma_evaluate_gsl(near_m55);

   consume_result(result);
   set_call_count(
      (sizeof(factorials) 
      + sizeof(near_1) 
      + sizeof(near_2)
      + sizeof(near_0)
      + sizeof(near_m10)
      + sizeof(near_m55)) / sizeof(factorials[0]));
}

#endif