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>
5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/common/Q/ilogbl.c
          +++ new/usr/src/lib/libm/common/Q/ilogbl.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      -#if defined(ELFOBJ)
  31      -#pragma weak ilogbl = __ilogbl
  32      -#endif
       30 +#pragma weak __ilogbl = ilogbl
  33   31  
  34   32  #include "libm.h"
  35   33  #include "xpg6.h"       /* __xpg6 */
  36   34  
  37   35  #if defined(__sparc)
  38   36  #define ISNORMALL(k, x) (k != 0x7fff)                   /* assuming k != 0 */
  39   37  #define X86PDNRM(k, x)
  40   38  #define XSCALE_OFFSET   0x406f                          /* 0x3fff + 112 */
  41   39  static const long double xscale = 5192296858534827628530496329220096.0L;
  42   40                                                                  /* 2^112 */

  43   41  #elif defined(__x86)
  44   42  /*
  45   43   * if pseudo-denormal, replace by the equivalent normal
  46   44   */
  47   45  #define X86PDNRM(k, x)  if (k == 0 && (((int *) &x)[1] & 0x80000000) != 0) \
  48   46                                  ((int *) &x)[2] |= k = 1
  49   47  #if defined(HANDLE_UNSUPPORTED)                         /* assuming k != 0 */
  50   48  #define ISNORMALL(k, x) (k != 0x7fff && (((int *) &x)[1] & 0x80000000) != 0)
  51   49  #else
  52   50  #define ISNORMALL(k, x) (k != 0x7fff)
  53   51  #endif
  54   52  #define XSCALE_OFFSET   0x403e                          /* 0x3fff + 63 */
  55   53  static const long double xscale = 9223372036854775808.0L;       /* 2^63 */
  56   54  #endif
  57   55  
  58   56  static int
  59   57  raise_invalid(int v) {  /* SUSv3 requires ilogbl(0,+/-Inf,NaN) raise invalid */
  60   58  #ifndef lint
  61   59          if ((__xpg6 & _C99SUSv3_ilogb_0InfNaN_raises_invalid) != 0) {
  62   60                  static const double zero = 0.0;
  63   61                  volatile double dummy;
  64   62  
  65   63                  dummy = zero / zero;
  66   64          }
  67   65  #endif
  68   66          return (v);
  69   67  }
  70   68  
  71   69  int
  72   70  ilogbl(long double x) {
  73   71          int k = XBIASED_EXP(x);
  74   72  
  75   73          X86PDNRM(k, x);
  76   74          if (k == 0) {
  77   75                  if (ISZEROL(x))
  78   76                          return (raise_invalid(0x80000001));
  79   77                  else {
  80   78                          x *= xscale;            /* scale up by 2^112 or 2^63 */
  81   79                          return (XBIASED_EXP(x) - XSCALE_OFFSET);
  82   80                  }
  83   81          } else if (ISNORMALL(k, x))
  84   82                  return (k - 0x3fff);
  85   83          else
  86   84                  return (raise_invalid(0x7fffffff));
  87   85  }

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