151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/*-
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* Copyright (c) 2008 David Schultz <das@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Tests for fmax{,f,l}() and fmin{,f,l}.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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#include <stdio.h>
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#define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
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FE_OVERFLOW | FE_UNDERFLOW)
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#pragma STDC FENV_ACCESS ON
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/*
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* Test for equality with two special rules:
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* fpequal(NaN, NaN) is true
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* fpequal(+0.0, -0.0) is false
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*/
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static inline int
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fpequal(long double x, long double y)
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{
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return ((x == y && !signbit(x) == !signbit(y))
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|| (isnan(x) && isnan(y)));
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}
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/*
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* Test whether func(x, y) has the expected result, and make sure no
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* exceptions are raised.
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*/
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#define TEST(func, type, x, y, expected) do { \
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type __x = (x); /* convert before we clear exceptions */ \
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type __y = (y); \
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feclearexcept(ALL_STD_EXCEPT); \
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long double __result = func((__x), (__y)); \
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if (fetestexcept(ALL_STD_EXCEPT)) { \
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fprintf(stderr, #func "(%.20Lg, %.20Lg) raised 0x%x\n", \
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(x), (y), fetestexcept(FE_ALL_EXCEPT)); \
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ok = 0; \
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} \
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if (!fpequal(__result, (expected))) { \
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fprintf(stderr, #func "(%.20Lg, %.20Lg) = %.20Lg, " \
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"expected %.20Lg\n", (x), (y), __result, (expected)); \
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ok = 0; \
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} \
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} while (0)
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int
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testall_r(long double big, long double small)
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{
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int ok;
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long double expected_max = isnan(big) ? small : big;
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long double expected_min = isnan(small) ? big : small;
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ok = 1;
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TEST(fmaxf, float, big, small, expected_max);
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TEST(fmaxf, float, small, big, expected_max);
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TEST(fmax, double, big, small, expected_max);
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TEST(fmax, double, small, big, expected_max);
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TEST(fmaxl, long double, big, small, expected_max);
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TEST(fmaxl, long double, small, big, expected_max);
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TEST(fminf, float, big, small, expected_min);
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TEST(fminf, float, small, big, expected_min);
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TEST(fmin, double, big, small, expected_min);
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TEST(fmin, double, small, big, expected_min);
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TEST(fminl, long double, big, small, expected_min);
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TEST(fminl, long double, small, big, expected_min);
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return (ok);
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}
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/*
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* Test all the functions: fmaxf, fmax, fmaxl, fminf, fmin, and fminl,
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* in all rounding modes and with the arguments in different orders.
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* The input 'big' must be >= 'small'.
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*/
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void
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testall(int testnum, long double big, long double small)
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{
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static const int rmodes[] = {
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FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO
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};
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int i;
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for (i = 0; i < 4; i++) {
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fesetround(rmodes[i]);
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if (!testall_r(big, small)) {
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fprintf(stderr, "FAILURE in rounding mode %d\n",
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rmodes[i]);
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break;
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}
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}
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printf("%sok %d - big = %.20Lg, small = %.20Lg\n",
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(i == 4) ? "" : "not ", testnum, big, small);
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}
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int
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main(int argc, char *argv[])
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{
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printf("1..12\n");
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testall(1, 1.0, 0.0);
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testall(2, 42.0, nextafterf(42.0, -INFINITY));
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testall(3, nextafterf(42.0, INFINITY), 42.0);
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testall(4, -5.0, -5.0);
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testall(5, -3.0, -4.0);
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testall(6, 1.0, NAN);
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testall(7, INFINITY, NAN);
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testall(8, INFINITY, 1.0);
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testall(9, -3.0, -INFINITY);
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testall(10, 3.0, -INFINITY);
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testall(11, NAN, NAN);
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/* This test isn't strictly required to work by C99. */
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testall(12, 0.0, -0.0);
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return (0);
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}
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