Home | History | Annotate | Line # | Download | only in libm
t_remquo.c revision 1.2 
      1 /* $NetBSD: t_remquo.c,v 1.2 2024/09/20 22:24:51 rin Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jukka Ruohonen and Greg Troxel.
      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 
     32 #include <assert.h>
     33 #include <atf-c.h>
     34 #include <float.h>
     35 #include <math.h>
     36 
     37 /*
     38  * remquo(3)
     39  */
     40 ATF_TC(remquo_args);
     41 ATF_TC_HEAD(remquo_args, tc)
     42 {
     43 	atf_tc_set_md_var(tc, "descr", "Test some selected arguments");
     44 }
     45 
     46 ATF_TP_ADD_TCS(tp)
     47 {
     48 
     49 	ATF_TP_ADD_TC(tp, remquo_args);
     50 
     51 	return atf_no_error();
     52 }
     53 
     54 #ifdef __vax__
     55 
     56 ATF_TC_BODY(remquo_args, tc)
     57 {
     58         atf_tc_expect_fail("PR 57881: vax libm is missing various symbols");
     59         atf_tc_fail("missing remquo on vax");
     60 }
     61 
     62 #else /* !__vax__ */
     63 
     64 static const struct {
     65 	double		x;
     66 	double		y;
     67 	double		r;	/* expected */
     68 	int		quo;	/* expected */
     69 } args[] = {
     70 	{ -135.0,	-90.0,		45.0,	2 },
     71 	{ -45.0,	-90.0,		-45.0,	8 },
     72 	{ 45.0,		-90.0,		45.0,	-8 },
     73 	{ 135.0,	-90.0,		-45.0,	-2 },
     74 	{ -180.0,	90.0,		-0.0,	-2 },
     75 	{ -135.0,	90.0,		45.0,	-2 },
     76 	{ -90.0,	90.0,		-0.0,	-1 },
     77 	{ -45.0,	90.0,		-45.0,	-8 },
     78 	{ 0.0,		90.0,		0.0,	0 },
     79 	{ 45.0,		90.0,		45.0,	8 },
     80 	{ 90.0,		90.0,		0.0,	1 },
     81 	{ 135.0,	90.0,		-45.0,	2 },
     82 	{ 180.0,	90.0,		0.0,	2 },
     83 };
     84 
     85 ATF_TC_BODY(remquo_args, tc)
     86 {
     87 	const double eps = DBL_EPSILON;
     88 	size_t i;
     89 
     90 	for (i = 0; i < __arraycount(args); i++) {
     91 		double x = args[i].x;
     92 		double y = args[i].y;
     93 		double r;
     94 		double r_exp = args[i].r;
     95 		int quo;
     96 		int quo_exp = args[i].quo;
     97 
     98 		bool ok = true;
     99 
    100 		r = remquo(x, y, &quo);
    101 
    102 		ok &= (fabs(r - r_exp) <= eps);
    103 
    104 		/*
    105 		 * For now, consider 0 to have positive sign.
    106 		 */
    107 		if (quo_exp < 0 && quo >= 0)
    108 			ok = false;
    109 		if (quo_exp >= 0 && quo < 0)
    110 			ok = false;
    111 
    112 		/*
    113 		 * The specification requires that quo be congruent to
    114 		 * the integer remainder modulo 2^k for some k >=3.
    115 		 */
    116 		ok &= ((quo & 0x7) == (quo_exp & 0x7));
    117 
    118 		if (!ok) {
    119 			atf_tc_fail_nonfatal("remquo(%g, %g) "
    120 			    "r/quo expected %g/%d != %g/%d",
    121 			     x, y, r_exp, quo_exp, r, quo);
    122 		}
    123 	}
    124 }
    125 
    126 #endif /* !__vax__ */
    127