exprtk_funcall_benchmark.cpp File Reference

#include <cstdio>
#include <string>
#include "exprtk.hpp"

Include dependency graph for exprtk_funcall_benchmark.cpp:

Go to the source code of this file.

Classes
struct	func0< T >

Functions
template<typename T >
T	func1 (T v1, T v2)
template<typename T >
void	function_call_benchmark01 ()
int	main ()

Function Documentation

func1()

template<typename T >

T func1 ( T  v1, T  v2  )

inline

Definition at line 42 of file exprtk_funcall_benchmark.cpp.

{
   return T(1) + std::cos(v1 * v2) / T(3);
}

function_call_benchmark01()

template<typename T >

void function_call_benchmark01

(

)

Definition at line 48 of file exprtk_funcall_benchmark.cpp.

{
   typedef exprtk::symbol_table<T>         symbol_table_t;
   typedef exprtk::expression<T>           expression_t;
   typedef exprtk::parser<T>               parser_t;
   typedef exprtk::function_compositor<T>  compositor_t;
   typedef typename compositor_t::function function_t;
 
   T v1 = T(1);
   T v2 = T(2);
 
   func0<T> f0;
 
   symbol_table_t symbol_table;
 
   symbol_table.add_constants();
 
   symbol_table.add_variable("v1"   , v1           );
   symbol_table.add_variable("v2"   , v2           );
   symbol_table.add_function("func0", f0           );
   symbol_table.add_function("func1", func1<double>);
 
   compositor_t compositor(symbol_table);
 
   compositor.add(
      function_t("func2")
      .var("v1").var("v2")
      .expression(" 1 + cos(v1 * v2) / 3;"));
 
   const std::string program0 = "func0(v1,v2);";
   const std::string program1 = "func1(v1,v2);";
   const std::string program2 = "func2(v1,v2);";
 
   expression_t expression0(symbol_table);
   expression_t expression1(symbol_table);
   expression_t expression2(symbol_table);
 
   parser_t parser;
 
   if (!parser.compile(program0,expression0))
   {
      printf("Error: %s\tExpression: %s\n",
             parser.error().c_str(),
             program0.c_str());
 
      return;
   }
 
   if (!parser.compile(program1,expression1))
   {
      printf("Error: %s\tExpression: %s\n",
             parser.error().c_str(),
             program1.c_str());
 
      return;
   }
 
   if (!parser.compile(program2,expression2))
   {
      printf("Error: %s\tExpression: %s\n",
             parser.error().c_str(),
             program1.c_str());
 
      return;
   }
 
   const std::size_t rounds = 100000000;
 
   {
      T total = T(0);
 
      exprtk::timer timer;
      timer.start();
 
      for (std::size_t r = 0; r < rounds; ++r)
      {
         total += expression0.value();
         std::swap(v1,v2);
      }
 
      timer.stop();
 
      printf("[custom function]  Total time: %8.3fsec\tRate: %15.3f\tTotal:%20.5f\n",
             timer.time(),
             rounds / timer.time(),
             total);
   }
 
   {
      T total = T(0);
 
      exprtk::timer timer;
      timer.start();
 
      for (std::size_t r = 0; r < rounds; ++r)
      {
         total += expression1.value();
         std::swap(v1,v2);
      }
 
      timer.stop();
 
      printf("[free function  ]  Total time: %8.3fsec\tRate: %15.3f\tTotal:%20.5f\n",
             timer.time(),
             rounds / timer.time(),
             total);
   }
 
   {
      T total = T(0);
 
      exprtk::timer timer;
      timer.start();
 
      for (std::size_t r = 0; r < rounds; ++r)
      {
         total += expression2.value();
         std::swap(v1,v2);
      }
 
      timer.stop();
 
      printf("[compositor     ]  Total time: %8.3fsec\tRate: %15.3f\tTotal:%20.5f\n",
             timer.time(),
             rounds / timer.time(),
             total);
   }
 
   {
      T total = T(0);
 
      exprtk::timer timer;
      timer.start();
 
      for (std::size_t r = 0; r < rounds; ++r)
      {
         total += func1<T>(v1,v2);
         std::swap(v1,v2);
      }
 
      timer.stop();
 
      printf("[native         ]  Total time: %8.3fsec\tRate: %15.3f\tTotal:%20.5f\n",
             timer.time(),
             rounds / timer.time(),
             total);
   }
}

References rounds, exprtk::timer::start(), exprtk::timer::stop(), and exprtk::timer::time().

Here is the call graph for this function:

main()

int main

(

)

Definition at line 197 of file exprtk_funcall_benchmark.cpp.

{
   function_call_benchmark01<double>();
   return 0;
}