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/cosl.c
          +++ new/usr/src/lib/libm/common/LD/cosl.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 cosl = __cosl
       30 +#pragma weak __cosl = cosl
  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_sinl        ... sin function on [-pi/4,pi/4]
  38   38   *      __k_cosl        ... cos function on [-pi/4,pi/4]
  39   39   *      __rem_pio2l     ... argument reduction routine
  40   40   *

  41   41   * Method.
  42   42   *      Let S and C denote the sin and cos respectively on [-PI/4, +PI/4].
  43   43   *      1. Assume the argument x is reduced to y1+y2 = x-k*pi/2 in
  44   44   *         [-pi/2 , +pi/2], and let n = k mod 4.
  45   45   *      2. Let S=S(y1+y2), C=C(y1+y2). Depending on n, we have
  46   46   *
  47   47   *          n        sin(x)      cos(x)        tan(x)
  48   48   *     ----------------------------------------------------------
  49   49   *          0          S           C             S/C
  50   50   *          1          C          -S            -C/S
  51   51   *          2         -S          -C             S/C
  52   52   *          3         -C           S            -C/S
  53   53   *     ----------------------------------------------------------
  54   54   *
  55   55   * Special cases:

  56   56   *      Let trig be any of sin, cos, or tan.
  57   57   *      trig(+-INF)  is NaN, with signals;
  58   58   *      trig(NaN)    is that NaN;
  59   59   *
  60   60   * Accuracy:
  61   61   *      computer TRIG(x) returns trig(x) nearly rounded.
  62   62   */
  63   63  /* INDENT ON */
  64   64  
  65   65  #include "libm.h"
  66      -#include "libm_synonyms.h"
  67   66  #include "longdouble.h"
  68   67  
  69   68  #include <sys/isa_defs.h>
  70   69  
  71   70  long double
  72   71  cosl(long double x) {
  73   72          long double y[2], z = 0.0L;
  74   73          int n, ix;
  75   74          int *px = (int *) &x;
  76   75  

  77   76          /* trig(Inf or NaN) is NaN */
  78   77          if (!finitel(x))
  79   78                  return x - x;
  80   79  
  81   80          /* High word of x. */
  82   81  #if defined(__i386) || defined(__amd64)
  83   82          XTOI(px, ix);
  84   83  #else
  85   84          ix = px[0];
  86   85  #endif
  87   86  
  88   87          /* |x| ~< pi/4 */
  89   88          ix &= 0x7fffffff;
  90   89          if (ix <= 0x3ffe9220)
  91   90                  return __k_cosl(x, z);
  92   91  
  93   92          /* argument reduction needed */
  94   93          else {
  95   94                  n = __rem_pio2l(x, y);
  96   95                  switch (n & 3) {
  97   96                  case 0:
  98   97                          return __k_cosl(y[0], y[1]);
  99   98                  case 1:
 100   99                          return -__k_sinl(y[0], y[1]);
 101  100                  case 2:
 102  101                          return -__k_cosl(y[0], y[1]);
 103  102                  case 3:
 104  103                          return __k_sinl(y[0], y[1]);
 105  104                  /* NOTREACHED */
 106  105                  }
 107  106          }
 108  107      return 0.0L;
 109  108  }

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