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/tan.c
          +++ new/usr/src/lib/libm/common/C/tan.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 tan = __tan
       30 +#pragma weak __tan = tan
  31   31  
  32   32  /* INDENT OFF */
  33   33  /*
  34   34   * tan(x)
  35   35   * Table look-up algorithm by K.C. Ng, November, 1989.
  36   36   *
  37   37   * kernel function:
  38   38   *      __k_tan         ... tangent function on [-pi/4,pi/4]
  39   39   *      __rem_pio2      ... argument reduction routine
  40   40   */
  41   41  /* INDENT ON */
  42   42  
  43   43  #include "libm.h"
  44      -#include "libm_synonyms.h"
  45   44  #include "libm_protos.h"
  46   45  #include <math.h>
  47   46  
  48   47  double
  49   48  tan(double x) {
  50   49          double y[2], z = 0.0;
  51   50          int n, ix;
  52   51  
  53   52          /* high word of x */
  54   53          ix = ((int *) &x)[HIWORD];

  55   54  
  56   55          /* |x| ~< pi/4 */
  57   56          ix &= 0x7fffffff;
  58   57          if (ix <= 0x3fe921fb)
  59   58                  return (__k_tan(x, z, 0));
  60   59  
  61   60          /* tan(Inf or NaN) is NaN */
  62   61          else if (ix >= 0x7ff00000) {
  63   62  #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
  64   63                  return (ix >= 0x7ff80000 ? x : x - x);  /* NaN */
  65   64                  /* assumes sparc-like QNaN */
  66   65  #else
  67   66                  return (x - x);                         /* NaN */
  68   67  #endif
  69   68          }
  70   69  
  71   70          /* argument reduction needed */
  72   71          else {
  73   72                  n = __rem_pio2(x, y);
  74   73                  return (__k_tan(y[0], y[1], n & 1));
  75   74          }
  76   75  }

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX