| 1 | /* Copyright (C) 1999 Free Software Foundation, Inc.
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| 2 | This file is part of the GNU C Library.
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| 3 | Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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| 4 |
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| 5 | The GNU C Library is free software; you can redistribute it and/or
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| 6 | modify it under the terms of the GNU Lesser General Public
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| 7 | License as published by the Free Software Foundation; either
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| 8 | version 2.1 of the License, or (at your option) any later version.
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| 9 |
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| 10 | The GNU C Library is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public
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| 16 | License along with the GNU C Library; if not, write to the Free
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| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 18 | 02111-1307 USA. */
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| 19 |
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| 20 | #include <math.h>
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| 21 | #include <float.h>
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| 22 | #include <stdio.h>
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| 23 |
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| 24 | static int errors = 0;
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| 25 |
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| 26 |
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| 27 | static void
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| 28 | check (const char *testname, int result)
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| 29 | {
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| 30 | if (!result) {
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| 31 | printf ("Failure: %s\n", testname);
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| 32 | errors++;
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| 33 | }
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| 34 | }
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| 35 |
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| 36 | #define TEST_FUNC(NAME, FLOAT, NANFUNC, EPSILON, HUGEVAL) \
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| 37 | static void \
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| 38 | NAME (void) \
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| 39 | { \
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| 40 | /* Variables are declared volatile to forbid some compiler \
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| 41 | optimizations. */ \
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| 42 | volatile FLOAT Inf_var, NaN_var, zero_var, one_var; \
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| 43 | FLOAT x1, x2; \
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| 44 | \
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| 45 | zero_var = 0.0; \
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| 46 | one_var = 1.0; \
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| 47 | NaN_var = zero_var/zero_var; \
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| 48 | Inf_var = one_var / zero_var; \
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| 49 | \
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| 50 | (void) &zero_var; \
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| 51 | (void) &one_var; \
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| 52 | (void) &NaN_var; \
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| 53 | (void) &Inf_var; \
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| 54 | \
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| 55 | \
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| 56 | check (#FLOAT " isinf (inf) == 1", isinf (Inf_var) == 1); \
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| 57 | check (#FLOAT " isinf (-inf) == -1", isinf (-Inf_var) == -1); \
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| 58 | check (#FLOAT " !isinf (1)", !(isinf (one_var))); \
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| 59 | check (#FLOAT " !isinf (NaN)", !(isinf (NaN_var))); \
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| 60 | \
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| 61 | check (#FLOAT " isnan (NaN)", isnan (NaN_var)); \
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| 62 | check (#FLOAT " isnan (-NaN)", isnan (-NaN_var)); \
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| 63 | check (#FLOAT " !isnan (1)", !(isnan (one_var))); \
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| 64 | check (#FLOAT " !isnan (inf)", !(isnan (Inf_var))); \
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| 65 | \
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| 66 | check (#FLOAT " inf == inf", Inf_var == Inf_var); \
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| 67 | check (#FLOAT " -inf == -inf", -Inf_var == -Inf_var); \
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| 68 | check (#FLOAT " inf != -inf", Inf_var != -Inf_var); \
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| 69 | check (#FLOAT " NaN != NaN", NaN_var != NaN_var); \
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| 70 | \
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| 71 | /* \
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| 72 | the same tests but this time with NAN from <bits/nan.h> \
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| 73 | NAN is a double const \
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| 74 | */ \
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| 75 | check (#FLOAT " isnan (NAN)", isnan (NAN)); \
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| 76 | check (#FLOAT " isnan (-NAN)", isnan (-NAN)); \
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| 77 | check (#FLOAT " !isinf (NAN)", !(isinf (NAN))); \
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| 78 | check (#FLOAT " !isinf (-NAN)", !(isinf (-NAN))); \
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| 79 | check (#FLOAT " NAN != NAN", NAN != NAN); \
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| 80 | \
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| 81 | /* \
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| 82 | And again with the value returned by the `nan' function. \
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| 83 | */ \
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| 84 | check (#FLOAT " isnan (NAN)", isnan (NANFUNC (""))); \
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| 85 | check (#FLOAT " isnan (-NAN)", isnan (-NANFUNC (""))); \
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| 86 | check (#FLOAT " !isinf (NAN)", !(isinf (NANFUNC ("")))); \
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| 87 | check (#FLOAT " !isinf (-NAN)", !(isinf (-NANFUNC ("")))); \
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| 88 | check (#FLOAT " NAN != NAN", NANFUNC ("") != NANFUNC ("")); \
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| 89 | \
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| 90 | /* test if EPSILON is ok */ \
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| 91 | x1 = 1.0; \
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| 92 | x2 = x1 + EPSILON; \
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| 93 | check (#FLOAT " 1 != 1+EPSILON", x1 != x2); \
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| 94 | \
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| 95 | x1 = 1.0; \
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| 96 | x2 = x1 - EPSILON; \
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| 97 | check (#FLOAT " 1 != 1-EPSILON", x1 != x2); \
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| 98 | \
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| 99 | /* test if HUGE_VALx is ok */ \
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| 100 | x1 = HUGEVAL; \
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| 101 | check (#FLOAT " isinf (HUGE_VALx) == +1", isinf (x1) == +1); \
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| 102 | x1 = - HUGEVAL; \
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| 103 | check (#FLOAT " isinf (-HUGE_VALx) == -1", isinf (x1) == -1); \
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| 104 | }
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| 105 |
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| 106 | TEST_FUNC (float_test, float, nanf, FLT_EPSILON, HUGE_VALF)
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| 107 | TEST_FUNC (double_test, double, nan, DBL_EPSILON, HUGE_VAL)
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| 108 | #ifndef NO_LONG_DOUBLE
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| 109 | TEST_FUNC (ldouble_test, long double, nanl, LDBL_EPSILON, HUGE_VALL)
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| 110 | #endif
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| 111 |
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| 112 | int
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| 113 | main (void)
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| 114 | {
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| 115 | float_test ();
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| 116 | double_test ();
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| 117 |
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| 118 | #ifndef NO_LONG_DOUBLE
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| 119 | ldouble_test ();
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| 120 | #endif
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| 121 |
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| 122 | return errors != 0;
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| 123 | }
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