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>
5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/common/Q/asinl.c
          +++ new/usr/src/lib/libm/common/Q/asinl.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      -#if defined(ELFOBJ)
  31      -#pragma weak asinl = __asinl
  32      -#endif
       30 +#pragma weak __asinl = asinl
  33   31  
  34   32  /*
  35   33   *      asinl(x) = atan2l(x,sqrt(1-x*x));
  36   34   *
  37   35   * For better accuracy, 1-x*x is computed as follows
  38   36   *      1-x*x                     if x <  0.5,
  39   37   *      2*(1-|x|)-(1-|x|)*(1-|x|) if x >= 0.5.
  40   38   *
  41   39   * Special cases:
  42   40   *      if x is NaN, return x itself;

  43   41   *      if |x|>1, return NaN with invalid signal.
  44   42   */
  45   43  
  46   44  #include "libm.h"
  47   45  
  48   46  static const long double zero = 0.0L, small = 1.0e-20L, half = 0.5L, one = 1.0L;
  49   47  #ifndef lint
  50   48  static const long double big = 1.0e+20L;
  51   49  #endif
  52   50  
  53   51  long double
  54   52  asinl(long double x) {
  55   53          long double t, w;
  56   54          volatile long double dummy;
  57   55  
  58   56          w = fabsl(x);
  59   57          if (isnanl(x))
  60   58                  return (x + x);
  61   59          else if (w <= half) {
  62   60                  if (w < small) {
  63   61  #ifndef lint
  64   62                          dummy = w + big;
  65   63                                                          /* inexact if w != 0 */
  66   64  #endif
  67   65                          return (x);
  68   66                  } else
  69   67                          return (atanl(x / sqrtl(one - x * x)));
  70   68          } else if (w < one) {
  71   69                  t = one - w;
  72   70                  w = t + t;
  73   71                  return (atanl(x / sqrtl(w - t * t)));
  74   72          } else if (w == one)
  75   73                  return (atan2l(x, zero));       /* asin(+-1) =  +- PI/2 */
  76   74          else
  77   75                  return (zero / zero);           /* |x| > 1: invalid */
  78   76  }

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