2 * Copyright (c) 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
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.
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
28 * Tests for corner cases in exp*().
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
44 #define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
45 FE_OVERFLOW | FE_UNDERFLOW)
47 #pragma STDC FENV_ACCESS ON
50 * Test that a function returns the correct value and sets the
51 * exception flags correctly. The exceptmask specifies which
52 * exceptions we should check. We need to be lenient for several
53 * reasoons, but mainly because on some architectures it's impossible
54 * to raise FE_OVERFLOW without raising FE_INEXACT.
56 * These are macros instead of functions so that assert provides more
57 * meaningful error messages.
59 * XXX The volatile here is to avoid gcc's bogus constant folding and work
60 * around the lack of support for the FENV_ACCESS pragma.
62 #define test(func, x, result, exceptmask, excepts) do { \
63 volatile long double _d = x; \
64 assert(feclearexcept(FE_ALL_EXCEPT) == 0); \
65 assert(fpequal((func)(_d), (result))); \
66 assert(((func), fetestexcept(exceptmask) == (excepts))); \
69 /* Test all the functions that compute b^x. */
70 #define _testall0(x, result, exceptmask, excepts) do { \
71 test(exp, x, result, exceptmask, excepts); \
72 test(expf, x, result, exceptmask, excepts); \
73 test(exp2, x, result, exceptmask, excepts); \
74 test(exp2f, x, result, exceptmask, excepts); \
77 /* Skip over exp2l on platforms that don't support it. */
79 #define testall0 _testall0
81 #define testall0(x, result, exceptmask, excepts) do { \
82 _testall0(x, result, exceptmask, excepts); \
83 test(exp2l, x, result, exceptmask, excepts); \
87 /* Test all the functions that compute b^x - 1. */
88 #define testall1(x, result, exceptmask, excepts) do { \
89 test(expm1, x, result, exceptmask, excepts); \
90 test(expm1f, x, result, exceptmask, excepts); \
94 * Determine whether x and y are equal, with two special rules:
99 fpequal(long double x, long double y)
101 return ((x == y && !signbit(x) == !signbit(y)) || isnan(x) && isnan(y));
105 run_generic_tests(void)
108 /* exp(0) == 1, no exceptions raised */
109 testall0(0.0, 1.0, ALL_STD_EXCEPT, 0);
110 testall1(0.0, 0.0, ALL_STD_EXCEPT, 0);
111 testall0(-0.0, 1.0, ALL_STD_EXCEPT, 0);
112 testall1(-0.0, -0.0, ALL_STD_EXCEPT, 0);
114 /* exp(NaN) == NaN, no exceptions raised */
115 testall0(NAN, NAN, ALL_STD_EXCEPT, 0);
116 testall1(NAN, NAN, ALL_STD_EXCEPT, 0);
118 /* exp(Inf) == Inf, no exceptions raised */
119 testall0(INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
120 testall1(INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
122 /* exp(-Inf) == 0, no exceptions raised */
123 testall0(-INFINITY, 0.0, ALL_STD_EXCEPT, 0);
124 testall1(-INFINITY, -1.0, ALL_STD_EXCEPT, 0);
126 #if !defined(__i386__)
127 /* exp(big) == Inf, overflow exception */
128 testall0(50000.0, INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_OVERFLOW);
129 testall1(50000.0, INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_OVERFLOW);
131 /* exp(small) == 0, underflow and inexact exceptions */
132 testall0(-50000.0, 0.0, ALL_STD_EXCEPT, FE_UNDERFLOW | FE_INEXACT);
134 testall1(-50000.0, -1.0, ALL_STD_EXCEPT, FE_INEXACT);
143 * We should insist that exp2() return exactly the correct
144 * result and not raise an inexact exception for integer
147 feclearexcept(FE_ALL_EXCEPT);
148 for (i = FLT_MIN_EXP - FLT_MANT_DIG; i < FLT_MAX_EXP; i++) {
149 assert(exp2f(i) == ldexpf(1.0, i));
150 assert(fetestexcept(ALL_STD_EXCEPT) == 0);
152 for (i = DBL_MIN_EXP - DBL_MANT_DIG; i < DBL_MAX_EXP; i++) {
153 assert(exp2(i) == ldexp(1.0, i));
154 assert(fetestexcept(ALL_STD_EXCEPT) == 0);
156 for (i = LDBL_MIN_EXP - LDBL_MANT_DIG; i < LDBL_MAX_EXP; i++) {
157 assert(exp2l(i) == ldexpl(1.0, i));
158 assert(fetestexcept(ALL_STD_EXCEPT) == 0);
163 main(int argc, char *argv[])
169 printf("ok 1 - exponential\n");
175 printf("ok 2 - exponential\n");
178 printf("ok 3 - exponential\n");