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/scalbl.c
          +++ new/usr/src/lib/libm/common/LD/scalbl.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 scalbl = __scalbl
       30 +#pragma weak __scalbl = scalbl
  31   31  
  32   32  /*
  33   33   * scalbl(x,n): return x * 2**n by manipulating exponent.
  34   34   */
  35   35  
  36   36  #include "libm.h"
  37   37  #include "longdouble.h"
  38   38  
  39   39  #include <sys/isa_defs.h>
  40   40  

  41   41  long double
  42   42  scalbl(long double x, long double fn) {
  43   43          int *py = (int *) &fn, n;
  44   44          long double z;
  45   45  
  46   46          if (isnanl(x) || isnanl(fn))
  47   47                  return x * fn;
  48   48  
  49   49          /* fn is +/-Inf */
  50   50  #if defined(_BIG_ENDIAN)
  51   51          if ((py[0] & 0x7fff0000) == 0x7fff0000) {
  52   52                  if ((py[0] & 0x80000000) != 0)
  53   53  #else
  54   54          if ((py[2] & 0x7fff) == 0x7fff) {
  55   55                  if ((py[2] & 0x8000) != 0)
  56   56  #endif
  57   57                          return x / (-fn);
  58   58                  else
  59   59                          return x * fn;
  60   60          }
  61   61          if (rintl(fn) != fn)
  62   62                  return (fn - fn) / (fn - fn);
  63   63          if (fn > 65000.0L)
  64   64                  z = scalbnl(x, 65000);
  65   65          else if (-fn > 65000.0L)
  66   66                  z = scalbnl(x, -65000);
  67   67          else {
  68   68                  n = (int) fn;
  69   69                  z = scalbnl(x, n);
  70   70          }
  71   71          return z;
  72   72  }

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