tools/tests/libMicro/exp.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms
   5  * of the Common Development and Distribution License
   6  * (the "License").  You may not use this file except
   7  * in compliance with the License.
   8  *
   9  * You can obtain a copy of the license at
  10  * src/OPENSOLARIS.LICENSE
  11  * or http://www.opensolaris.org/os/licensing.
  12  * See the License for the specific language governing
  13  * permissions and limitations under the License.
  14  *
  15  * When distributing Covered Code, include this CDDL
  16  * HEADER in each file and include the License file at
  17  * usr/src/OPENSOLARIS.LICENSE.  If applicable,
  18  * add the following below this CDDL HEADER, with the
  19  * fields enclosed by brackets "[]" replaced with your
  20  * own identifying information: Portions Copyright [yyyy]
  21  * [name of copyright owner]
  22  *
  23  * CDDL HEADER END
  24  */
  25
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 /*
  32  * test exp performance (should add range check)
  33  */
  34
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <math.h>
  39
  40 #include "libmicro.h"
  41
  42 int
  43 benchmark_init()
  44 {
  45         (void) sprintf(lm_usage, "note: measures exp()");
  46         lm_nsecs_per_op = 25;
  47         lm_tsdsize = 0;
  48         return (0);
  49 }
  50
  51 /*ARGSUSED*/
  52 int
  53 benchmark(void *tsd, result_t *res)
  54 {
  55         int                     i;
  56         /* Added as part of the fix for radar 7508837 */
  57         double                  t = 0.0;
  58
  59         for (i = 0; i < lm_optB; i += 10) {
  60                 double value = 1.0 / (i + .01);
  61 #if 1 /* Apple added code, see radar 7508837 */
  62                 t += exp(value);
  63                 t += exp(value + 1.0);
  64                 t += exp(value + 2.0);
  65                 t += exp(value + 3.0);
  66                 t += exp(value + 4.0);
  67                 t += exp(value + 5.0);
  68                 t += exp(value + 6.0);
  69                 t += exp(value + 7.0);
  70                 t += exp(value + 8.0);
  71                 t += exp(value + 9.0);
  72         }
  73         res->re_count = i;
  74
  75         return ((int)(t - t));
  76 #else
  77                 (void) exp(value);
  78                 (void) exp(value);
  79                 (void) exp(value);
  80                 (void) exp(value);
  81                 (void) exp(value);
  82                 (void) exp(value);
  83                 (void) exp(value);
  84                 (void) exp(value);
  85                 (void) exp(value);
  86                 (void) exp(value);
  87         }
  88         res->re_count = i;
  89
  90         return (0);
  91 #endif /* end of Apple fix  */
  92 }