tests/test-math.c

   1 /* Test of <math.h> substitute.
   2    Copyright (C) 2007-2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <math.h>
  22
  23 #ifndef NAN
  24 # error NAN should be defined
  25 choke me
  26 #endif
  27
  28 #ifndef HUGE_VALF
  29 # error HUGE_VALF should be defined
  30 choke me
  31 #endif
  32
  33 #ifndef HUGE_VAL
  34 # error HUGE_VAL should be defined
  35 choke me
  36 #endif
  37
  38 #ifndef HUGE_VALL
  39 # error HUGE_VALL should be defined
  40 choke me
  41 #endif
  42
  43 #ifndef FP_ILOGB0
  44 # error FP_ILOGB0 should be defined
  45 choke me
  46 #endif
  47
  48 #ifndef FP_ILOGBNAN
  49 # error FP_ILOGBNAN should be defined
  50 choke me
  51 #endif
  52
  53 #include <limits.h>
  54
  55 #include "macros.h"
  56
  57 #if 0
  58 /* Check that NAN expands into a constant expression.  */
  59 static float n = NAN;
  60 #endif
  61
  62 /* Compare two numbers with ==.
  63    This is a separate function because IRIX 6.5 "cc -O" miscompiles an
  64    'x == x' test.  */
  65 static int
  66 numeric_equalf (float x, float y)
  67 {
  68   return x == y;
  69 }
  70 static int
  71 numeric_equald (double x, double y)
  72 {
  73   return x == y;
  74 }
  75 static int
  76 numeric_equall (long double x, long double y)
  77 {
  78   return x == y;
  79 }
  80
  81 int
  82 main (void)
  83 {
  84   double d = NAN;
  85   double zero = 0.0;
  86   ASSERT (!numeric_equald (d, d));
  87
  88   d = HUGE_VAL;
  89   ASSERT (numeric_equald (d, 1.0 / zero));
  90
  91   ASSERT (numeric_equalf (HUGE_VALF, HUGE_VALF + HUGE_VALF));
  92
  93   ASSERT (numeric_equald (HUGE_VAL, HUGE_VAL + HUGE_VAL));
  94
  95   ASSERT (numeric_equall (HUGE_VALL, HUGE_VALL + HUGE_VALL));
  96
  97   /* Check the value of FP_ILOGB0.  */
  98   ASSERT (FP_ILOGB0 == INT_MIN || FP_ILOGB0 == - INT_MAX);
  99
 100   /* Check the value of FP_ILOGBNAN.  */
 101   ASSERT (FP_ILOGBNAN == INT_MIN || FP_ILOGBNAN == INT_MAX);
 102
 103   return 0;
 104 }