comparison src/fftw-3.3.3/libbench2/timer.c @ 10:37bf6b4a2645

Add FFTW3

+/*
+ * Copyright (c) 2001 Matteo Frigo
+ * Copyright (c) 2001 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+
+#include "bench.h"
+#include <stdio.h>
+
+/* 
+ * System-dependent timing functions:
+ */
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_BSDGETTIMEOFDAY
+#ifndef HAVE_GETTIMEOFDAY
+#define gettimeofday BSDgettimeofday
+#define HAVE_GETTIMEOFDAY 1
+#endif
+#endif
+
+double time_min;
+int time_repeat;
+
+#if !defined(HAVE_TIMER) && (defined(__WIN32__) || defined(_WIN32) || defined(_WINDOWS) || defined(__CYGWIN__))
+#include <windows.h>
+typedef LARGE_INTEGER mytime;
+
+static mytime get_time(void)
+{
+     mytime tv;
+     QueryPerformanceCounter(&tv);
+     return tv;
+}
+
+static double elapsed(mytime t1, mytime t0)
+{
+     LARGE_INTEGER freq;
+     QueryPerformanceFrequency(&freq);
+     return (((double) t1.QuadPart - (double) t0.QuadPart)) /
+	  ((double) freq.QuadPart);
+}
+
+#define HAVE_TIMER
+#endif
+
+
+#if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_TIMER)
+typedef struct timeval mytime;
+
+static mytime get_time(void)
+{
+     struct timeval tv;
+     gettimeofday(&tv, 0);
+     return tv;
+}
+
+static double elapsed(mytime t1, mytime t0)
+{
+     return ((double) t1.tv_sec - (double) t0.tv_sec) +
+	  ((double) t1.tv_usec - (double) t0.tv_usec) * 1.0E-6;
+}
+
+#define HAVE_TIMER
+#endif
+
+#ifndef HAVE_TIMER
+#error "timer not defined"
+#endif
+
+static double calibrate(void)
+{
+     /* there seems to be no reasonable way to calibrate the
+	clock automatically any longer.  Grrr... */
+
+     return 0.01;
+}
+
+
+void timer_init(double tmin, int repeat)
+{
+     static int inited = 0;
+
+     if (inited)
+	  return;
+     inited = 1;
+
+     if (!repeat)
+	  repeat = 8;
+     time_repeat = repeat;
+
+     if (tmin > 0)
+	  time_min = tmin;
+     else
+	  time_min = calibrate();
+}
+
+static mytime t0[BENCH_NTIMERS];
+
+void timer_start(int n)
+{
+     BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
+     t0[n] = get_time();
+}
+
+double timer_stop(int n)
+{
+     mytime t1;
+     BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
+     t1 = get_time();
+     return elapsed(t1, t0[n]);
+}
+