5261 libm should stop using synonyms.h

          --- old/usr/src/lib/libm/common/Q/logbl.c
          +++ new/usr/src/lib/libm/common/Q/logbl.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 logbl = __logbl
       30 +#pragma weak __logbl = logbl
  31   31  
  32   32  #include "libm.h"
  33   33  #include "xpg6.h"       /* __xpg6 */
  34   34  #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  35   35  
  36   36  #if defined(__sparc)
  37   37  #define ISNORMALL(k, x) (k != 0x7fff)                   /* assuming k != 0 */
  38   38  #define X86PDNRM(k, x)
  39   39  #define XSCALE_OFFSET   0x406f                          /* 0x3fff + 112 */
  40   40  static const long double xscale = 5192296858534827628530496329220096.0L;

  41   41                                                                  /* 2^112 */
  42   42  #elif defined(__x86)
  43   43  /*
  44   44   * if pseudo-denormal, replace by the equivalent normal
  45   45   */
  46   46  #define X86PDNRM(k, x)  if (k == 0 && (((int *) &x)[1] & 0x80000000) != 0) \
  47   47                                  ((int *) &x)[2] |= k = 1
  48   48  #if defined(HANDLE_UNSUPPORTED)                         /* assuming k != 0 */
  49   49  #define ISNORMALL(k, x) (k != 0x7fff && (((int *) &x)[1] & 0x80000000) != 0)
  50   50  #else
  51   51  #define ISNORMALL(k, x) (k != 0x7fff)
  52   52  #endif
  53   53  #define XSCALE_OFFSET   0x403e                          /* 0x3fff + 63 */
  54   54  static const long double xscale = 9223372036854775808.0L;       /* 2^63 */
  55   55  #endif
  56   56  
  57   57  static long double
  58   58  raise_division(long double v) {
  59   59  #pragma STDC FENV_ACCESS ON
  60   60          static const long double zero = 0.0L;
  61   61          return (v / zero);
  62   62  }
  63   63  
  64   64  long double
  65   65  logbl(long double x) {
  66   66          int k = XBIASED_EXP(x);
  67   67  
  68   68          X86PDNRM(k, x);
  69   69          if (k == 0) {
  70   70                  if (ISZEROL(x))
  71   71                          return (raise_division(-1.0L));
  72   72                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
  73   73                          x *= xscale;            /* scale up by 2^112 or 2^63 */
  74   74                          return (long double) (XBIASED_EXP(x) - XSCALE_OFFSET);
  75   75                  } else
  76   76                          return (-16382.L);
  77   77          } else if (ISNORMALL(k, x))
  78   78                  return ((long double) (k - 0x3fff));
  79   79          else
  80   80                  return (x * x);
  81   81  }

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