5261 libm should stop using synonyms.h

          --- old/usr/src/lib/libm/common/R/logbf.c
          +++ new/usr/src/lib/libm/common/R/logbf.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 logbf = __logbf
       30 +#pragma weak __logbf = logbf
  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(__x86)
  37   37  static const float two25 = 33554432.0F;
  38   38  #else
  39   39  /*
  40   40   * v: a non-zero subnormal |x|

  41   41   */
  42   42  static int
  43   43  ilogbf_subnormal(unsigned v) {
  44   44          int r = -126 - 23;
  45   45  
  46   46          if (v & 0xffff0000)
  47   47                  r += 16, v >>= 16;
  48   48          if (v & 0xff00)
  49   49                  r += 8, v >>= 8;
  50   50          if (v & 0xf0)
  51   51                  r += 4, v >>= 4;
  52   52          v <<= 1;
  53   53          return (r + ((0xffffaa50 >> v) & 0x3));
  54   54  }
  55   55  #endif  /* defined(__x86) */
  56   56  
  57   57  static float
  58   58  raise_division(float t) {
  59   59  #pragma STDC FENV_ACCESS ON
  60   60          static const float zero = 0.0F;
  61   61          return (t / zero);
  62   62  }
  63   63  
  64   64  float
  65   65  logbf(float x) {
  66   66          int k = *((int *) &x) & ~0x80000000;
  67   67  
  68   68          if (k < 0x00800000) {
  69   69                  if (k == 0)
  70   70                          return (raise_division(-1.0F));
  71   71                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
  72   72  #if defined(__x86)
  73   73                          x *= two25;
  74   74                          return ((float) (((*((int *) &x) & 0x7f800000) >> 23) -
  75   75                                  152));
  76   76  #else
  77   77                          return ((float) ilogbf_subnormal(k));
  78   78  #endif
  79   79                  } else
  80   80                          return (-126.F);
  81   81          } else if (k < 0x7f800000)
  82   82                  return ((float) ((k >> 23) - 127));
  83   83          else
  84   84                  return (x * x);
  85   85  }

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX