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107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/* ####################################################################### */
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/* This script compares the speed of the computation of a polynomial */
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/* in C in a couple of different ways. */
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/* */
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/* Author: Francesc Alted */
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/* Date: 2010-02-05 */
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/* ####################################################################### */
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#include <stdio.h>
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#include <math.h>
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#if defined(_WIN32) && !defined(__MINGW32__)
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#include <time.h>
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#include <windows.h>
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#else
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#include <unistd.h>
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#include <sys/time.h>
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#endif
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#define N 10*1000*1000
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double x[N];
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double y[N];
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#if defined(_WIN32) && !defined(__MINGW32__)
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#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
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#else
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
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#endif
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struct timezone
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{
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int tz_minuteswest; /* minutes W of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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int gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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FILETIME ft;
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unsigned __int64 tmpres = 0;
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static int tzflag;
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if (NULL != tv)
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{
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GetSystemTimeAsFileTime(&ft);
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tmpres |= ft.dwHighDateTime;
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tmpres <<= 32;
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tmpres |= ft.dwLowDateTime;
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/*converting file time to unix epoch*/
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tmpres -= DELTA_EPOCH_IN_MICROSECS;
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tmpres /= 10; /*convert into microseconds*/
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tv->tv_sec = (long)(tmpres / 1000000UL);
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tv->tv_usec = (long)(tmpres % 1000000UL);
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}
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if (NULL != tz)
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{
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if (!tzflag)
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{
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_tzset();
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tzflag++;
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}
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tz->tz_minuteswest = _timezone / 60;
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tz->tz_dsttime = _daylight;
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}
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return 0;
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}
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#endif /* _WIN32 */
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/* Given two timeval stamps, return the difference in seconds */
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float getseconds(struct timeval last, struct timeval current) {
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int sec, usec;
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sec = current.tv_sec - last.tv_sec;
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usec = current.tv_usec - last.tv_usec;
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return (float)(((double)sec + usec*1e-6));
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}
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int main(void) {
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int i;
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double inf = -1;
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struct timeval last, current;
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float tspend;
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for(i=0; i<N; i++) {
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x[i] = inf+(2.*i)/N;
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}
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gettimeofday(&last, NULL);
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for(i=0; i<N; i++) {
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//y[i] = .25*pow(x[i],3.) + .75*pow(x[i],2.) - 1.5*x[i] - 2;
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y[i] = ((.25*x[i] + .75)*x[i] - 1.5)*x[i] - 2;
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}
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gettimeofday(¤t, NULL);
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tspend = getseconds(last, current);
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printf("Compute time:\t %.3fs\n", tspend);
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}
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