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/sinhl.c
          +++ new/usr/src/lib/libm/common/LD/sinhl.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 sinhl = __sinhl
       30 +#pragma weak __sinhl = sinhl
  31   31  
  32   32  #include "libm.h"
  33   33  #include "longdouble.h"
  34   34  
  35   35  /* SINH(X)
  36   36   * RETURN THE HYPERBOLIC SINE OF X
  37   37   *
  38   38   * Method :
  39   39   *      1. reduce x to non-negative by SINH(-x) = - SINH(x).
  40      - *      2. 
       40 + *      2.
  41   41   *
  42   42   *                                            EXPM1(x) + EXPM1(x)/(EXPM1(x)+1)
  43   43   *          0 <= x <= lnovft     : SINH(x) := --------------------------------
  44   44   *                                                            2
  45   45   *
  46   46   *     lnovft <= x <  INF        : SINH(x) := EXP(x-MEP1*ln2)*2**ME
  47      - *      
       47 + *
  48   48   * here
  49   49   *      lnovft          logarithm of the overflow threshold
  50   50   *                      = MEP1*ln2 chopped to machine precision.
  51   51   *      ME              maximum exponent
  52   52   *      MEP1            maximum exponent plus 1
  53   53   *
  54   54   * Special cases:
  55   55   *      SINH(x) is x if x is +INF, -INF, or NaN.
  56   56   *      only SINH(0)=0 is exact for finite argument.
  57   57   *

  58   58   */
  59   59  
  60   60  static const long double C[] = {
  61   61          0.5L,
  62   62          1.0L,
  63   63          1.135652340629414394879149e+04L,
  64   64          7.004447686242549087858985e-16L
  65   65  };
  66   66  
  67   67  #define half    C[0]
  68   68  #define one     C[1]
  69   69  #define lnovft  C[2]
  70   70  #define lnovlo  C[3]
  71   71  
  72   72  long double
  73   73  sinhl(long double x)
  74   74  {
  75   75          long double     r, t;
  76   76  
  77   77          if (!finitel(x))
  78   78                  return (x + x); /* x is INF or NaN */
  79   79          r = fabsl(x);
  80   80          if (r < lnovft) {
  81   81                  t = expm1l(r);
  82   82                  r = copysignl((t + t / (one + t)) * half, x);
  83   83          } else {
  84   84                  r = copysignl(expl((r - lnovft) - lnovlo), x);
  85   85                  r = scalbnl(r, 16383);
  86   86          }
  87   87          return (r);
  88   88  }

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