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/rint.c
          +++ new/usr/src/lib/libm/common/C/rint.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 2006 Sun Microsystems, Inc.  All rights reserved.
  26   26   * Use is subject to license terms.
  27   27   */
  28   28  
  29      -#pragma weak rint = __rint
       29 +#pragma weak __rint = rint
  30   30  
  31   31  /*
  32   32   * rint(x) return x rounded to integral according to the rounding direction
  33   33   * rint(x) returns result with the same sign as x's,  including 0.0.
  34   34   */
  35   35  
  36   36  #include "libm.h"
  37   37  
  38   38  #if defined(__i386) && !defined(__amd64) && (!defined(__FLT_EVAL_METHOD__) || \
  39   39          __FLT_EVAL_METHOD__ != 0)

  40   40  extern enum fp_precision_type __swapRP(enum fp_precision_type);
  41   41  #define DECLRP(x)       enum fp_precision_type x;
  42   42  #define SWAPRP(new, x)  x = __swapRP(new);
  43   43  #define RESTRP(x)       (void) __swapRP(x);
  44   44  #else
  45   45  #define DECLRP(x)
  46   46  #define SWAPRP(new, x)
  47   47  #define RESTRP(x)
  48   48  #endif
  49   49  
  50   50  static const double
  51   51          two52 = 4503599627370496.0,
  52   52          zero = 0.0,
  53   53          one = 1.0;
  54   54  
  55   55  double
  56   56  rint(double x) {
  57   57          DECLRP(rp)
  58   58          double  t, w;
  59   59          int     ix, hx;
  60   60  
  61   61          ix = ((int *)&x)[HIWORD];
  62   62          hx = ix & ~0x80000000;
  63   63  
  64   64          if (hx >= 0x43300000)
  65   65                  return (x * one);
  66   66          t = (ix < 0)? -two52 : two52;
  67   67          SWAPRP(fp_double, rp)           /* set precision mode to double */
  68   68          w = x + t;                      /* x+sign(x)*2**52 rounded */
  69   69          RESTRP(rp)                      /* restore precision mode */
  70   70          if (w == t)
  71   71                  return ((ix < 0)? -zero : zero);
  72   72          return (w - t);
  73   73  }

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