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/*
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 * Copyright (c) 1997-1999 Massachusetts Institute of Technology
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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/*
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 * timer.c -- this file measures the execution time of
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 *            ffts.  This information is used by the planner.
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 */
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/* $Id: timer.c,v 1.1.1.1 2002-03-29 14:12:57 pj Exp $ */
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#include <ports/time.h>
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#include <ports/fftw-int.h>
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#include <ports/math.h>
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#include <ports/stdlib.h>
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/********************* System-specific Timing Support *********************/
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#if defined(HAVE_MAC_TIMER) && !defined(HAVE_MAC_PCI_TIMER)
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/* Use Macintosh Time Manager to get the time: */
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/*
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 * make sure compiler (CW) recognizes the pascal keywords that are in
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 * Timer.h
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 */
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#pragma only_std_keywords off   
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#include <ports/Timer.h>
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#pragma only_std_keywords reset
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fftw_time get_Mac_microseconds(void)
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{
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     fftw_time t;
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     UnsignedWide microsec;     /*
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                                 * microsec.lo and microsec.hi are
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                                 * unsigned long's, and are the two parts
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                                 * of a 64 bit unsigned integer
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                                 */
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     Microseconds(&microsec);   /* get time in microseconds */
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     /* store lo and hi words into our structure: */
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     t.lo = microsec.lo;
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     t.hi = microsec.hi;
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     return t;
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}
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fftw_time fftw_time_diff(fftw_time t1, fftw_time t2)
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/*
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 * This function takes the difference t1 - t2 of two 64 bit
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 * integers, represented by the 32 bit lo and hi words.
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 * if t1 < t2, returns 0.
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 */
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{
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     fftw_time diff;
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     if (t1.hi < t2.hi) {       /* something is wrong...t1 < t2! */
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          diff.hi = diff.lo = 0;
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          return diff;
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     } else
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          diff.hi = t1.hi - t2.hi;
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     if (t1.lo < t2.lo) {
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          if (diff.hi > 0)
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               diff.hi -= 1;    /* carry */
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          else {                /* something is wrong...t1 < t2! */
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               diff.hi = diff.lo = 0;
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               return diff;
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          }
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     }
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     diff.lo = t1.lo - t2.lo;
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     return diff;
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}
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#endif
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#ifdef HAVE_WIN32_TIMER
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#include <ports/windows.h>
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static LARGE_INTEGER gFreq;
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static int gHaveHiResTimer = 0;
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static int gFirstTime = 1;
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unsigned long GetPerfTime(void)
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{
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     LARGE_INTEGER lCounter;
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     if (gFirstTime) {
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          gFirstTime = 0;
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          if (QueryPerformanceFrequency(&gFreq)) {
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               gHaveHiResTimer = 1;
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          }
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     }
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     if (gHaveHiResTimer) {
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          QueryPerformanceCounter(&lCounter);
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          return lCounter.u.LowPart;
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     } else {
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          return (unsigned long) clock();
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     }
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}
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double GetPerfSec(double pTime)
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{
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     if (gHaveHiResTimer) {
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          return pTime / gFreq.u.LowPart;       // assumes HighPart==0
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     } else {
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          return pTime / CLOCKS_PER_SEC;
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     }
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}
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#endif                          /* HAVE_WIN32_TIMER */
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#if defined(FFTW_USE_GETTIMEOFDAY)
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/* timer support routines for systems having gettimeofday */
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#ifdef HAVE_BSDGETTIMEOFDAY
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#define gettimeofday BSDgettimeofday
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#endif
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fftw_time fftw_gettimeofday_get_time(void)
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{
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     struct timeval tv;
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     gettimeofday(&tv, 0);
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     return tv;
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}
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fftw_time fftw_gettimeofday_time_diff(fftw_time t1, fftw_time t2)
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{
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     fftw_time diff;
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     diff.tv_sec = t1.tv_sec - t2.tv_sec;
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     diff.tv_usec = t1.tv_usec - t2.tv_usec;
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     /* normalize */
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     while (diff.tv_usec < 0) {
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          diff.tv_usec += 1000000L;
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          diff.tv_sec -= 1;
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     }
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     return diff;
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}
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#endif