tools/regression/lib/msun/test-rem.c

   1 /*-
   2  * Copyright (c) 2005-2008 David Schultz <das@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * Test for remainder functions: remainder, remainderf, remainderl,
  29  * remquo, remquof, and remquol.
  30  * Missing tests: fmod, fmodf.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <assert.h>
  37 #include <float.h>
  38 #include <math.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <strings.h>
  42
  43 static void test_invalid(long double, long double);
  44 static void testl(long double, long double, long double, int);
  45 static void testd(double, double, double, int);
  46 static void testf(float, float, float, int);
  47
  48 #define test(x, y, e_r, e_q) do {       \
  49         testl(x, y, e_r, e_q);          \
  50         testd(x, y, e_r, e_q);          \
  51         testf(x, y, e_r, e_q);          \
  52 } while (0)
  53
  54 int
  55 main(int argc, char *argv[])
  56 {
  57
  58         printf("1..2\n");
  59
  60         test_invalid(0.0, 0.0);
  61         test_invalid(1.0, 0.0);
  62         test_invalid(INFINITY, 0.0);
  63         test_invalid(INFINITY, 1.0);
  64         test_invalid(-INFINITY, 1.0);
  65         test_invalid(NAN, 1.0);
  66         test_invalid(1.0, NAN);
  67
  68         test(4, 4, 0, 1);
  69         test(0, 3.0, 0, 0);
  70         testd(0x1p-1074, 1, 0x1p-1074, 0x1p-1074);
  71         testf(0x1p-149, 1, 0x1p-149, 0x1p-149);
  72         test(3.0, 4, -1, 1);
  73         test(3.0, -4, -1, -1);
  74         testd(275 * 1193040, 275, 0, 1193040);
  75         test(4.5 * 7.5, 4.5, -2.25, 8); /* we should get the even one */
  76         testf(0x1.9044f6p-1, 0x1.ce662ep-1, -0x1.f109cp-4, 1);
  77 #if LDBL_MANT_DIG > 53
  78         testl(-0x1.23456789abcdefp-2000L, 0x1.fedcba987654321p-2000L,
  79               0x1.b72ea61d950c862p-2001L, -1);
  80 #endif
  81
  82         printf("ok 1 - rem\n");
  83
  84         /*
  85          * The actual quotient here is 864062210.50000003..., but
  86          * double-precision division gets -8.64062210.5, which rounds
  87          * the wrong way.  This test ensures that remquo() is smart
  88          * enough to get the low-order bit right.
  89          */
  90         testd(-0x1.98260f22fc6dep-302, 0x1.fb3167c430a13p-332,
  91             0x1.fb3165b82de72p-333, -864062211);
  92         /* Even harder cases with greater exponent separation */
  93         test(0x1.fp100, 0x1.ep-40, -0x1.cp-41, 143165577);
  94         testd(-0x1.abcdefp120, 0x1.87654321p-120,
  95             -0x1.69c78ec4p-121, -63816414);
  96
  97         printf("ok 2 - rem\n");
  98
  99         return (0);
 100 }
 101
 102 static void
 103 test_invalid(long double x, long double y)
 104 {
 105         int q;
 106
 107         q = 0xdeadbeef;
 108
 109         assert(isnan(remainder(x, y)));
 110         assert(isnan(remquo(x, y, &q)));
 111 #ifdef STRICT
 112         assert(q == 0xdeadbeef);
 113 #endif
 114
 115         assert(isnan(remainderf(x, y)));
 116         assert(isnan(remquof(x, y, &q)));
 117 #ifdef STRICT
 118         assert(q == 0xdeadbeef);
 119 #endif
 120
 121         assert(isnan(remainderl(x, y)));
 122         assert(isnan(remquol(x, y, &q)));
 123 #ifdef STRICT
 124         assert(q == 0xdeadbeef);
 125 #endif
 126 }
 127
 128 /* 0x012345 ==> 0x01ffff */
 129 static inline int
 130 mask(int x)
 131 {
 132         return ((unsigned)~0 >> (32 - fls(x)));
 133 }
 134
 135 static void
 136 testl(long double x, long double y, long double expected_rem, int expected_quo)
 137 {
 138         int q;
 139
 140         q = random();
 141         assert(remainderl(x, y) == expected_rem);
 142         assert(remquol(x, y, &q) == expected_rem);
 143         assert((q & 0x7) == (expected_quo & 0x7));
 144         if (q != 0) {
 145                 assert((q > 0) ^ !(expected_quo > 0));
 146                 q = abs(q);
 147                 assert(q == (abs(expected_quo) & mask(q)));
 148         }
 149 }
 150
 151 static void
 152 testd(double x, double y, double expected_rem, int expected_quo)
 153 {
 154         int q;
 155
 156         q = random();
 157         assert(remainder(x, y) == expected_rem);
 158         assert(remquo(x, y, &q) == expected_rem);
 159         assert((q & 0x7) == (expected_quo & 0x7));
 160         if (q != 0) {
 161                 assert((q > 0) ^ !(expected_quo > 0));
 162                 q = abs(q);
 163                 assert(q == (abs(expected_quo) & mask(q)));
 164         }
 165 }
 166
 167 static void
 168 testf(float x, float y, float expected_rem, int expected_quo)
 169 {
 170         int q;
 171
 172         q = random();
 173         assert(remainderf(x, y) == expected_rem);
 174         assert(remquof(x, y, &q) == expected_rem);
 175         assert((q & 0x7) == (expected_quo & 0x7));
 176         if (q != 0) {
 177                 assert((q > 0) ^ !(expected_quo > 0));
 178                 q = abs(q);
 179                 assert((q & mask(q)) == (abs(expected_quo) & mask(q)));
 180         }
 181 }