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/R/ilogbf.c
          +++ new/usr/src/lib/libm/common/R/ilogbf.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 ilogbf = __ilogbf
  32      -#endif
       30 +#pragma weak __ilogbf = ilogbf
  33   31  
  34   32  #include "libm.h"
  35   33  #include "xpg6.h"       /* __xpg6 */
  36   34  
  37      -#if defined(USE_FPSCALE) || defined(__x86)
       35 +#if defined(__x86)
  38   36  static const float two25 = 33554432.0F;
  39   37  #else
  40   38  /*
  41   39   * v: a non-zero subnormal |x|
  42   40   */
  43   41  static int
  44   42  ilogbf_subnormal(unsigned v) {
  45   43          int r = -126 - 23;
  46   44  
  47   45          if (v & 0xffff0000)
  48   46                  r += 16, v >>= 16;
  49   47          if (v & 0xff00)
  50   48                  r += 8, v >>= 8;
  51   49          if (v & 0xf0)
  52   50                  r += 4, v >>= 4;
  53   51          v <<= 1;
  54   52          return (r + ((0xffffaa50 >> v) & 0x3));
  55   53  }
  56      -#endif  /* defined(USE_FPSCALE) */
       54 +#endif  /* defined(__x86) */
  57   55  
  58   56  static int
  59   57  raise_invalid(int v) {  /* SUSv3 requires ilogbf(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  ilogbf(float x) {
  73   71          int k = *((int *) &x) & ~0x80000000;
  74   72  
  75   73          if (k < 0x00800000) {
  76   74                  if (k == 0)
  77   75                          return (raise_invalid(0x80000001));
  78   76                  else {
  79      -#if defined(USE_FPSCALE) || defined(__x86)
       77 +#if defined(__x86)
  80   78                          x *= two25;
  81   79                          return (((*((int *) &x) & 0x7f800000) >> 23) - 152);
  82   80  #else
  83   81                          return (ilogbf_subnormal(k));
  84   82  #endif
  85   83                  }
  86   84          } else if (k < 0x7f800000)
  87   85                  return ((k >> 23) - 127);
  88   86          else
  89   87                  return (raise_invalid(0x7fffffff));
  90   88  }
    

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