ref: 4f9a9087f16b92662389be3dc0589629359ac8a4
dir: /libfaad/fftw/timer.c/
/*
* Copyright (c) 1997-1999 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* timer.c -- this file measures the execution time of
* ffts. This information is used by the planner.
*/
/* $Id: timer.c,v 1.1 2002/04/07 21:26:05 menno Exp $ */
#include <time.h>
#include <fftw-int.h>
#include <math.h>
#include <stdlib.h>
/********************* System-specific Timing Support *********************/
#if defined(HAVE_MAC_TIMER) && !defined(HAVE_MAC_PCI_TIMER)
/* Use Macintosh Time Manager to get the time: */
/*
* make sure compiler (CW) recognizes the pascal keywords that are in
* Timer.h
*/
#pragma only_std_keywords off
#include <Timer.h>
#pragma only_std_keywords reset
fftw_time get_Mac_microseconds(void)
{
fftw_time t;
UnsignedWide microsec; /*
* microsec.lo and microsec.hi are
* unsigned long's, and are the two parts
* of a 64 bit unsigned integer
*/
Microseconds(µsec); /* get time in microseconds */
/* store lo and hi words into our structure: */
t.lo = microsec.lo;
t.hi = microsec.hi;
return t;
}
fftw_time fftw_time_diff(fftw_time t1, fftw_time t2)
/*
* This function takes the difference t1 - t2 of two 64 bit
* integers, represented by the 32 bit lo and hi words.
* if t1 < t2, returns 0.
*/
{
fftw_time diff;
if (t1.hi < t2.hi) { /* something is wrong...t1 < t2! */
diff.hi = diff.lo = 0;
return diff;
} else
diff.hi = t1.hi - t2.hi;
if (t1.lo < t2.lo) {
if (diff.hi > 0)
diff.hi -= 1; /* carry */
else { /* something is wrong...t1 < t2! */
diff.hi = diff.lo = 0;
return diff;
}
}
diff.lo = t1.lo - t2.lo;
return diff;
}
#endif
#ifdef HAVE_WIN32_TIMER
#include <windows.h>
static LARGE_INTEGER gFreq;
static int gHaveHiResTimer = 0;
static int gFirstTime = 1;
unsigned long GetPerfTime(void)
{
LARGE_INTEGER lCounter;
if (gFirstTime) {
gFirstTime = 0;
if (QueryPerformanceFrequency(&gFreq)) {
gHaveHiResTimer = 1;
}
}
if (gHaveHiResTimer) {
QueryPerformanceCounter(&lCounter);
return lCounter.u.LowPart;
} else {
return (unsigned long) clock();
}
}
double GetPerfSec(double pTime)
{
if (gHaveHiResTimer) {
return pTime / gFreq.u.LowPart; // assumes HighPart==0
} else {
return pTime / CLOCKS_PER_SEC;
}
}
#endif /* HAVE_WIN32_TIMER */
#if defined(FFTW_USE_GETTIMEOFDAY)
/* timer support routines for systems having gettimeofday */
#if defined(HAVE_BSDGETTIMEOFDAY) && ! defined(HAVE_GETTIMEOFDAY)
#define gettimeofday BSDgettimeofday
#endif
fftw_time fftw_gettimeofday_get_time(void)
{
struct timeval tv;
gettimeofday(&tv, 0);
return tv;
}
fftw_time fftw_gettimeofday_time_diff(fftw_time t1, fftw_time t2)
{
fftw_time diff;
diff.tv_sec = t1.tv_sec - t2.tv_sec;
diff.tv_usec = t1.tv_usec - t2.tv_usec;
/* normalize */
while (diff.tv_usec < 0) {
diff.tv_usec += 1000000L;
diff.tv_sec -= 1;
}
return diff;
}
#endif