tests/lib/libm/t_precision.c

   1 /* $NetBSD: t_precision.c,v 1.2 2014/11/04 00:20:19 justin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Joerg Sonnenberger.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: t_precision.c,v 1.2 2014/11/04 00:20:19 justin Exp $");
  33
  34 #include <atf-c.h>
  35
  36 #include <float.h>
  37 #include <stdlib.h>
  38
  39 ATF_TC(t_precision);
  40
  41 ATF_TC_HEAD(t_precision, tc)
  42 {
  43         atf_tc_set_md_var(tc, "descr",
  44             "Basic precision test for double and long double");
  45 }
  46
  47 volatile double x = 1;
  48 volatile long double y = 1;
  49
  50 ATF_TC_BODY(t_precision, tc)
  51 {
  52         x += DBL_EPSILON;
  53         ATF_CHECK(x != 1.0);
  54         x -= 1;
  55         ATF_CHECK(x == DBL_EPSILON);
  56
  57         x = 2;
  58         x += DBL_EPSILON;
  59         ATF_CHECK(x == 2.0);
  60
  61         y += LDBL_EPSILON;
  62         ATF_CHECK(y != 1.0L);
  63         y -= 1;
  64         ATF_CHECK(y == LDBL_EPSILON);
  65         y = 2;
  66         y += LDBL_EPSILON;
  67         ATF_CHECK(y == 2.0L);
  68 }
  69
  70 ATF_TP_ADD_TCS(tp)
  71 {
  72         ATF_TP_ADD_TC(tp, t_precision);
  73
  74         return atf_no_error();
  75 }