usr/src/lib/libast/common/port/astmath.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 /*
  23  * used to test if -last requires -lm
  24  *
  25  *      arch            -last                   -lm
  26  *      ----            -----                   ---
  27  *      linux.sparc     sfdlen,sfputd           frexp,ldexp
  28  */
  29
  30 #if N >= 8
  31 #define _ISOC99_SOURCE  1
  32 #endif
  33
  34 #include <math.h>
  35
  36 int
  37 main()
  38 {
  39 #if N & 1
  40         long double     value = 0;
  41 #else
  42         double          value = 0;
  43 #endif
  44 #if N < 5
  45         int             exp = 0;
  46 #endif
  47
  48 #if N == 1
  49         return ldexpl(value, exp) != 0;
  50 #endif
  51 #if N == 2
  52         return ldexp(value, exp) != 0;
  53 #endif
  54 #if N == 3
  55         return frexpl(value, &exp) != 0;
  56 #endif
  57 #if N == 4
  58         return frexp(value, &exp) != 0;
  59 #endif
  60 #if N == 5
  61         return isnan(value);
  62 #endif
  63 #if N == 6
  64         return isnan(value);
  65 #endif
  66 #if N == 7
  67         return copysign(1.0, value) < 0;
  68 #endif
  69 #if N == 8
  70         return signbit(value);
  71 #endif
  72 }