5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/common/LD/atanhl.c
          +++ new/usr/src/lib/libm/common/LD/atanhl.c

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END

  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24   24   */
  25   25  /*
  26   26   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27   27   * Use is subject to license terms.
  28   28   */
  29   29  
  30      -#pragma weak atanhl = __atanhl
       30 +#pragma weak __atanhl = atanhl
  31   31  
  32   32  #include "libm.h"
  33      -#include "libm_synonyms.h"
  34   33  
  35   34  #define GENERIC long double
  36   35  #define ATANH   atanhl
  37   36  
  38   37  /* ATANH(x)
  39   38   *                  1              2x                          x
  40   39   *      ATANH(x) = --- * LOG(1 + -------) = 0.5 * LOG1P(2 * --------)
  41   40   *                  2             1 - x                      1 - x
  42   41   * Note: to guarantee ATANH(-x) = -ATANH(x), we use
  43      - *                 sign(x)             |x|  
       42 + *                 sign(x)             |x|
  44   43   *      ATANH(x) = ------- * LOG1P(2*-------).
  45   44   *                    2              1 - |x|
  46   45   *
  47   46   * Special cases:
  48   47   *      ATANH(x) is NaN if |x| > 1 with signal;
  49   48   *      ATANH(NaN) is that NaN with no signal;
  50   49   *      ATANH(+-1) is +-INF with signal.
  51   50   *
  52   51   */
  53   52  

  54   53  #define FABS    fabsl
  55   54  #define LOG1P   log1pl
  56   55  #define COPYSIGN        copysignl
  57   56  

  58   57  
  59   58  extern GENERIC  FABS(),LOG1P(),COPYSIGN();
  60   59  
  61   60  static GENERIC
  62   61  zero    = (GENERIC) 0.0,
  63   62  half    = (GENERIC) 0.5,
  64   63  one     = (GENERIC) 1.0;
  65   64  
  66   65  GENERIC ATANH(x)
  67   66  GENERIC x;
  68      -{       
       67 +{
  69   68          GENERIC t;
  70   69          t = FABS(x);
  71   70          if (t == one) return x/zero;
  72   71          t = t/(one-t);
  73   72          return COPYSIGN(half,x)*LOG1P(t+t);
  74   73  }
    

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