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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>

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          --- old/usr/src/lib/libm/common/C/logb.c
          +++ new/usr/src/lib/libm/common/C/logb.c
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  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 logb = __logb
  32      -#pragma weak _logb = __logb
  33      -#endif
       30 +#pragma weak __logb = logb
       31 +#pragma weak _logb = logb
  34   32  
  35   33  #include "libm.h"
  36   34  #include "xpg6.h"       /* __xpg6 */
  37   35  #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  38   36  
  39      -#if defined(USE_FPSCALE) || defined(__x86)
       37 +#if defined(__x86)
  40   38  static const double two52 = 4503599627370496.0;
  41   39  #else
  42   40  /*
  43   41   * v: high part of a non-zero subnormal |x|; w: low part of |x|
  44   42   */
  45   43  static int
  46   44  ilogb_subnormal(unsigned v, unsigned w) {
  47   45          int r = -1022 - 52;
  48   46  
  49   47          if (v)
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  52   50                  v = w;
  53   51          if (v & 0xffff0000)
  54   52                  r += 16, v >>= 16;
  55   53          if (v & 0xff00)
  56   54                  r += 8, v >>= 8;
  57   55          if (v & 0xf0)
  58   56                  r += 4, v >>= 4;
  59   57          v <<= 1;
  60   58          return (r + ((0xffffaa50 >> v) & 0x3));
  61   59  }
  62      -#endif  /* defined(USE_FPSCALE) */
       60 +#endif  /* defined(__x86) */
  63   61  
  64   62  double
  65   63  logb(double x) {
  66   64          int *px = (int *) &x, k = px[HIWORD] & ~0x80000000;
  67   65  
  68   66          if (k < 0x00100000) {
  69   67                  if ((px[LOWORD] | k) == 0)
  70   68                          return (_SVID_libm_err(x, x, 45));
  71   69                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
  72      -#if defined(USE_FPSCALE) || defined(__x86)
       70 +#if defined(__x86)
  73   71                          x *= two52;
  74   72                          return ((double) (((px[HIWORD] & 0x7ff00000) >> 20)
  75   73                                  - 1075));
  76   74  #else
  77   75                          return ((double) ilogb_subnormal(k, px[LOWORD]));
  78   76  #endif
  79   77                  } else
  80   78                          return (-1022.0);
  81   79          } else if (k < 0x7ff00000)
  82   80                  return ((double) ((k >> 20) - 1023));
  83   81          else
  84   82                  return (x * x);
  85   83  }
    
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