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/ceil.c
          +++ new/usr/src/lib/libm/common/C/ceil.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 ceil = __ceil
       29 +#pragma weak __ceil = ceil
  30   30  
  31   31  /*
  32   32   * ceil(x) returns the least integral value bigger than or equal to x.
  33   33   * NOTE: ceil(x) returns result with the same sign as x's, including 0.
  34   34   *
  35   35   * Modified 8/4/04 for performance.
  36   36   */
  37   37  
  38   38  #include "libm.h"
  39   39  

  40   40  static const double
  41   41          zero = 0.0,
  42   42          one = 1.0,
  43   43          two52 = 4503599627370496.0;
  44   44  
  45   45  double
  46   46  ceil(double x) {
  47   47          double  t, w;
  48   48          int     hx, lx, ix;
  49   49  
  50   50          hx = ((int *)&x)[HIWORD];
  51   51          lx = ((int *)&x)[LOWORD];
  52   52          ix = hx & ~0x80000000;
  53   53          if (ix >= 0x43300000)   /* return x if |x| >= 2^52, or x is NaN */
  54   54                  return (x * one);
  55   55          t = (hx >= 0)? two52 : -two52;
  56   56          w = x + t;
  57   57          t = w - t;
  58   58          if (ix < 0x3ff00000) {
  59   59                  if ((ix | lx) == 0)
  60   60                          return (x);
  61   61                  else
  62   62                          return ((hx < 0)? -zero : one);
  63   63          }
  64   64          return ((t >= x)? t : t + one);
  65   65  }

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