--- 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   30  #if defined(ELFOBJ)
  31   31  #pragma weak asinl = __asinl
  32   32  #endif
  33   33  
  34   34  /*
  35   35   *      asinl(x) = atan2l(x,sqrt(1-x*x));
  36   36   *
  37   37   * For better accuracy, 1-x*x is computed as follows
  38   38   *      1-x*x                     if x <  0.5,
  39   39   *      2*(1-|x|)-(1-|x|)*(1-|x|) if x >= 0.5.
  40   40   *
  41   41   * Special cases:
  42   42   *      if x is NaN, return x itself;
  43   43   *      if |x|>1, return NaN with invalid signal.
  44   44   */
  45   45  

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

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