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编译器性能比较

转帖|其它|编辑：郝浩|2009-02-19 14:17:35.000|阅读 760 次

概述：编译器性能之间的区别！

在网上看到一篇C++编译器性能比较的文章

于是一时兴起，便把代码复制下来改了改，顺便改个了pascal的版本在自己机器上试了一下。

c++代码

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

// Function to be integrated
// Define and prototype it here
// | sin(x) |

#define INTEG_FUNC(x) fabs(sin(x))
    // Prototype timing function

#ifdef __cplusplus
extern "C" {
#endif
unsigned int __declspec(dllimport) __stdcall GetTickCount();
#ifdef __cplusplus
}
#endif

int main(void)
{
    // Loop counters and number of interior points
    unsigned int i, j, N;
    // Stepsize, independent variable x, and accumulated sum
    double step, x_i, sum;
    // Timing variables for evaluation
    unsigned int start, finish, duration, clock_t;
    // Start integral from
    double interval_begin = 0.0;
    // Complete integral at
    double interval_end = 2.0 * 3.141592653589793238;
    // Start timing for the entire application
    start = GetTickCount();
    printf(" \n");
    printf(" Number of | Computed Integral | \n");
    printf(" Interior Points | | \n");
    for (j=2;j<27;j++)
    {
    printf("------------------------------------- \n");
    // Compute the number of (internal rectangles + 1)
    N = 1 << j;
    // Compute stepsize for N-1 ;internal rectangles
    step = (interval_end - interval_begin) / N;
    // Approx. 1/2 area in first rectangle: f(x0) * [step/2]
    sum = INTEG_FUNC(interval_begin) * step / 2.0;
    // Apply midpoint rule:
    // Given length = f(x), compute the area of the
    // rectangle of width step
    // Sum areas of internal rectangle: f(xi + step) * step
    for (i=1;i<N;i++)
    {
        x_i = i * step;
        sum += INTEG_FUNC(x_i) * step;
    }
    // Approx. 1/2 area in last rectangle: f(xN) * [step/2]
    sum += INTEG_FUNC(interval_end) * step / 2.0;
    printf(" %10d | %14e | \n", N, sum);
    }
    finish = GetTickCount();
    duration = (finish - start);
    printf(" \n");
    printf(" Application Clocks = %d ms \n", duration);
    printf(" \n");
    getchar();
    return 0;
}

pascal代码

program Test;

{$APPTYPE CONSOLE}

uses
  Windows,
  SysUtils;

var
  i, j, N:      cardinal;
  start, duration: cardinal;
  step, x_i, sum: double;
  interval_begin: double = 0.0;
  interval_end: double = 2.0 * 3.141592653589793238;
begin
  start := GetTickCount;
  Writeln('');
  Writeln('Number of | Computed Integral | ');
  Writeln('Interior Points | | ');
  for j := 2 to 26 do
  begin
    Writeln('------------------------------------- ');
  ;  N    := 1 shl j;
    step := (interval_end - interval_begin) / N;

    sum := Abs(Sin(interval_begin)) * step / 2.0;

    for i := 1 to N - 1 do
    begin
      x_i := i * step;
      sum := sum + Abs(Sin(x_i)) * step;
    end;

    sum := sum + Abs(Sin(interval_end)) * step / 2.0;
    Writeln(Format(' %10d | %14.7e | ', [N, sum]));
  end;
  duration := GetTickCount - start;
  Writeln('');
  Writeln(Format('Application Clocks = %d ms ', [duration]));
  Writeln('');
  Readln;
end.

我的机器环境是windows xp sp3 + intel core2 1.5G

C++编译器使用的是g++4.3.0-mingw32,c++builder 2009的bcc32,和vs2008的cl

pascal编译器使用的是开源的freepascal编译器fpc2.2.3和dephi 2009的dcc32

开启优化测试结果如下（单位:ms）

g++     24531     24407     24390
bcc32   18078     17906     17938
cl          8922       8875       8875
fpc       12046      12015     12016
dcc32   13312      13313     13297

结果显示 cl>fpc>dcc32>bcc32>g++

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