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/Q/rintl.c
          +++ new/usr/src/lib/libm/common/Q/rintl.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 rintl = __rintl
       30 +#pragma weak __rintl = rintl
  31   31  
  32   32  /*
  33   33   * rintl(long double x) return x rounded to integral according to
  34   34   * the prevailing rounding direction
  35   35   *
  36   36   * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
  37   37   * with the same sign as x's, including 0.0L.
  38   38   */
  39   39  
  40   40  #include "libm.h"

  41   41  #include "longdouble.h"
  42   42  
  43   43  extern enum fp_precision_type __swapRP(enum fp_precision_type);
  44   44  
  45   45  static const double one = 1.0;
  46   46  static const long double qzero = 0.0L;
  47   47  
  48   48  long double
  49   49  rintl(long double x) {
  50   50          enum fp_precision_type rp;
  51   51          long double t, w, two112;
  52   52          int *pt = (int *) &two112;
  53   53  
  54   54          if (!finitel(x))
  55   55                  return (x + x);
  56   56  
  57   57          if (*(int *) &one != 0) {       /* set two112 = 2^112 */
  58   58                  pt[0] = 0x406f0000;
  59   59                  pt[1] = pt[2] = pt[3] = 0;
  60   60          } else {
  61   61                  pt[3] = 0x406f0000;
  62   62                  pt[0] = pt[1] = pt[2] = 0;
  63   63          }
  64   64  
  65   65          if (fabsl(x) >= two112)
  66   66                  return (x);     /* already an integer */
  67   67          t = copysignl(two112, x);
  68   68          rp = __swapRP(fp_extended);     /* make sure precision is long double */
  69   69          w = x + t;                      /* x+sign(x)*2^112 rounded to integer */
  70   70          (void) __swapRP(rp);            /* restore precision mode */
  71   71          if (w == t)
  72   72                  return (copysignl(qzero, x));   /* x rounded to zero */
  73   73          else
  74   74                  return (w - t);
  75   75  }

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