2 * Copyright (c) 2005-2008 David Schultz <das@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 * Test for remainder functions: remainder, remainderf, remainderl,
29 * remquo, remquof, and remquol.
30 * Missing tests: fmod, fmodf.
39 #include "test-utils.h"
41 static void test_invalid(long double, long double);
42 static void testl(long double, long double, long double, int);
43 static void testd(double, double, double, int);
44 static void testf(float, float, float, int);
46 #define test(x, y, e_r, e_q) do { \
47 testl(x, y, e_r, e_q); \
48 testd(x, y, e_r, e_q); \
49 testf(x, y, e_r, e_q); \
52 ATF_TC_WITHOUT_HEAD(rem1);
55 test_invalid(0.0, 0.0);
56 test_invalid(1.0, 0.0);
57 test_invalid(INFINITY, 0.0);
58 test_invalid(INFINITY, 1.0);
59 test_invalid(-INFINITY, 1.0);
60 test_invalid(NAN, 1.0);
61 test_invalid(1.0, NAN);
65 testd(0x1p-1074, 1, 0x1p-1074, 0);
66 testf(0x1p-149, 1, 0x1p-149, 0);
68 test(3.0, -4, -1, -1);
69 testd(275 * 1193040, 275, 0, 1193040);
70 test(4.5 * 7.5, 4.5, -2.25, 8); /* we should get the even one */
71 testf(0x1.9044f6p-1, 0x1.ce662ep-1, -0x1.f109cp-4, 1);
72 #if LDBL_MANT_DIG > 53
73 testl(-0x1.23456789abcdefp-2000L, 0x1.fedcba987654321p-2000L,
74 0x1.b72ea61d950c862p-2001L, -1);
78 ATF_TC_WITHOUT_HEAD(rem2);
82 * The actual quotient here is 864062210.50000003..., but
83 * double-precision division gets -8.64062210.5, which rounds
84 * the wrong way. This test ensures that remquo() is smart
85 * enough to get the low-order bit right.
87 testd(-0x1.98260f22fc6dep-302, 0x1.fb3167c430a13p-332,
88 0x1.fb3165b82de72p-333, -864062211);
89 /* Even harder cases with greater exponent separation */
90 test(0x1.fp100, 0x1.ep-40, -0x1.cp-41, 143165577);
91 testd(-0x1.abcdefp120, 0x1.87654321p-120, -0x1.69c78ec4p-121,
95 ATF_TC_WITHOUT_HEAD(rem3);
98 test(0x1.66666cp+120, 0x1p+71, 0.0, 1476395008);
99 testd(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1);
100 testl(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1);
101 testd(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189);
102 testl(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189);
106 test_invalid(long double x, long double y)
112 ATF_CHECK(isnan(remainder(x, y)));
113 ATF_CHECK(isnan(remquo(x, y, &q)));
115 ATF_CHECK(q == 0xdeadbeef);
118 ATF_CHECK(isnan(remainderf(x, y)));
119 ATF_CHECK(isnan(remquof(x, y, &q)));
121 ATF_CHECK(q == 0xdeadbeef);
124 ATF_CHECK(isnan(remainderl(x, y)));
125 ATF_CHECK(isnan(remquol(x, y, &q)));
127 ATF_CHECK(q == 0xdeadbeef);
131 /* 0x012345 ==> 0x01ffff */
135 return ((unsigned)~0 >> (32 - fls(x)));
139 testl(long double x, long double y, long double expected_rem, int expected_quo)
145 rem = remainderl(x, y);
146 ATF_CHECK(rem == expected_rem);
147 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
148 rem = remquol(x, y, &q);
149 ATF_CHECK(rem == expected_rem);
150 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
151 ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
152 ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
154 ATF_CHECK((q > 0) ^ !(expected_quo > 0));
156 ATF_CHECK(q == (abs(expected_quo) & mask(q)));
161 testd(double x, double y, double expected_rem, int expected_quo)
167 rem = remainder(x, y);
168 ATF_CHECK(rem == expected_rem);
169 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
170 rem = remquo(x, y, &q);
171 ATF_CHECK(rem == expected_rem);
172 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
173 ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
174 ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
176 ATF_CHECK((q > 0) ^ !(expected_quo > 0));
178 ATF_CHECK(q == (abs(expected_quo) & mask(q)));
183 testf(float x, float y, float expected_rem, int expected_quo)
189 rem = remainderf(x, y);
190 ATF_CHECK(rem == expected_rem);
191 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
192 rem = remquof(x, y, &q);
193 ATF_CHECK(rem == expected_rem);
194 ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
195 ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
196 ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
198 ATF_CHECK((q > 0) ^ !(expected_quo > 0));
200 ATF_CHECK((q & mask(q)) == (abs(expected_quo) & mask(q)));
206 ATF_TP_ADD_TC(tp, rem1);
207 ATF_TP_ADD_TC(tp, rem2);
208 ATF_TP_ADD_TC(tp, rem3);
210 return (atf_no_error());