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/C/sinh.c
          +++ new/usr/src/lib/libm/common/C/sinh.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   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23   23   */
  24   24  /*
  25   25   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26   26   * Use is subject to license terms.
  27   27   */
  28   28  
  29      -#pragma weak sinh = __sinh
       29 +#pragma weak __sinh = sinh
  30   30  
  31   31  /* INDENT OFF */
  32   32  /*
  33   33   * sinh(x)
  34   34   * Code originated from 4.3bsd.
  35   35   * Modified by K.C. Ng for SUN 4.0 libm.
  36   36   * Method :
  37   37   *      1. reduce x to non-negative by sinh(-x) = - sinh(x).
  38   38   *      2.
  39   39   *

  40   40   *                                   expm1(x) + expm1(x)/(expm1(x)+1)
  41   41   *   0 <= x <= lnovft   : sinh(x) := --------------------------------
  42   42   *                                                                     2
  43   43   *  lnovft <= x <  INF  : sinh(x) := exp(x-1024*ln2)*2**1023
  44   44   *
  45   45   *
  46   46   * Special cases:
  47   47   *      sinh(x) is x if x is +INF, -INF, or NaN.
  48   48   *      only sinh(0)=0 is exact for finite argument.
  49   49   *
  50   50   */
  51   51  /* INDENT ON */
  52   52  
  53   53  #include "libm.h"
  54   54  
  55   55  static const double
  56   56          ln2hi = 6.93147180369123816490e-01,
  57   57          ln2lo = 1.90821492927058770002e-10,
  58   58          lnovft = 7.09782712893383973096e+02;
  59   59  
  60   60  double
  61   61  sinh(double x) {
  62   62          double  ox, r, t;
  63   63  
  64   64          ox = x;
  65   65          r = fabs(x);
  66   66          if (!finite(x))
  67   67                  return (x * r);
  68   68          if (r < lnovft) {
  69   69                  t = expm1(r);
  70   70                  r = copysign((t + t / (1.0 + t)) * 0.5, x);
  71   71          } else {
  72   72                  if (r < 1000.0)
  73   73                          x = copysign(exp((r - 1024 * ln2hi) - 1024 * ln2lo), x);
  74   74                  r = scalbn(x, 1023);
  75   75          }
  76   76          if (!finite(r))
  77   77                  r = _SVID_libm_err(ox, ox, 25);
  78   78          return (r);
  79   79  }

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