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/tanl.c
          +++ new/usr/src/lib/libm/common/LD/tanl.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 tanl = __tanl
       30 +#pragma weak __tanl = tanl
  31   31  
  32   32  /* INDENT OFF */
  33   33  /* cosl(x)
  34   34   * Table look-up algorithm by K.C. Ng, November, 1989.
  35   35   *
  36   36   * kernel function:
  37   37   *      __k_tanl        ... tangent function on [-pi/4,pi/4]
  38   38   *      __rem_pio2l     ... argument reduction routine
  39   39   *
  40   40   * Method.

  41   41   *      Let S and C denote the sin and cos respectively on [-PI/4, +PI/4].
  42   42   *      1. Assume the argument x is reduced to y1+y2 = x-k*pi/2 in
  43   43   *         [-pi/2 , +pi/2], and let n = k mod 4.
  44   44   *      2. Let S=S(y1+y2), C=C(y1+y2). Depending on n, we have
  45   45   *
  46   46   *          n        sin(x)      cos(x)        tan(x)
  47   47   *     ----------------------------------------------------------
  48   48   *          0          S           C             S/C
  49   49   *          1          C          -S            -C/S
  50   50   *          2         -S          -C             S/C
  51   51   *          3         -C           S            -C/S
  52   52   *     ----------------------------------------------------------
  53   53   *
  54   54   * Special cases:

  55   55   *      Let trig be any of sin, cos, or tan.
  56   56   *      trig(+-INF)  is NaN, with signals;
  57   57   *      trig(NaN)    is that NaN;
  58   58   *
  59   59   * Accuracy:
  60   60   *      computer TRIG(x) returns trig(x) nearly rounded.
  61   61   */
  62   62  /* INDENT ON */
  63   63  
  64   64  #include "libm.h"
  65      -#include "libm_synonyms.h"
  66   65  #include "longdouble.h"
  67   66  
  68   67  #include <sys/isa_defs.h>
  69   68  
  70   69  long double
  71   70  tanl(long double x) {
  72   71          long double y[2], z = 0.0L;
  73   72          int n, ix;
  74   73  #if defined(__i386) || defined(__amd64)
  75   74          int *px = (int *) &x;

  76   75  #endif
  77   76  
  78   77          /* trig(Inf or NaN) is NaN */
  79   78          if (!finitel(x))
  80   79                  return x - x;
  81   80  
  82   81          /* High word of x. */
  83   82  #if defined(__i386) || defined(__amd64)
  84   83          XTOI(px, ix);
  85   84  #else
  86   85          ix = *(int *) &x;
  87   86  #endif
  88   87  
  89   88          /* |x| ~< pi/4 */
  90   89          ix &= 0x7fffffff;
  91   90          if (ix <= 0x3ffe9220)
  92   91                  return __k_tanl(x, z, 0);
  93   92  
  94   93          /* argument reduction needed */
  95   94          else {
  96   95                  n = __rem_pio2l(x, y);
  97   96                  return __k_tanl(y[0], y[1], n & 1);
  98   97          }
  99   98  }

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