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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/R/logbf.c
          +++ new/usr/src/lib/libm/common/R/logbf.c
↓ open down ↓ 19 lines elided ↑ open up ↑
  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 logbf = __logbf
  32      -#endif
       30 +#pragma weak __logbf = logbf
  33   31  
  34   32  #include "libm.h"
  35   33  #include "xpg6.h"       /* __xpg6 */
  36   34  #define _C99SUSv3_logb  _C99SUSv3_logb_subnormal_is_like_ilogb
  37   35  
  38      -#if defined(USE_FPSCALE) || defined(__x86)
       36 +#if defined(__x86)
  39   37  static const float two25 = 33554432.0F;
  40   38  #else
  41   39  /*
  42   40   * v: a non-zero subnormal |x|
  43   41   */
  44   42  static int
  45   43  ilogbf_subnormal(unsigned v) {
  46   44          int r = -126 - 23;
  47   45  
  48   46          if (v & 0xffff0000)
  49   47                  r += 16, v >>= 16;
  50   48          if (v & 0xff00)
  51   49                  r += 8, v >>= 8;
  52   50          if (v & 0xf0)
  53   51                  r += 4, v >>= 4;
  54   52          v <<= 1;
  55   53          return (r + ((0xffffaa50 >> v) & 0x3));
  56   54  }
  57      -#endif  /* defined(USE_FPSCALE) */
       55 +#endif  /* defined(__x86) */
  58   56  
  59   57  static float
  60   58  raise_division(float t) {
  61   59  #pragma STDC FENV_ACCESS ON
  62   60          static const float zero = 0.0F;
  63   61          return (t / zero);
  64   62  }
  65   63  
  66   64  float
  67   65  logbf(float x) {
  68   66          int k = *((int *) &x) & ~0x80000000;
  69   67  
  70   68          if (k < 0x00800000) {
  71   69                  if (k == 0)
  72   70                          return (raise_division(-1.0F));
  73   71                  else if ((__xpg6 & _C99SUSv3_logb) != 0) {
  74      -#if defined(USE_FPSCALE) || defined(__x86)
       72 +#if defined(__x86)
  75   73                          x *= two25;
  76   74                          return ((float) (((*((int *) &x) & 0x7f800000) >> 23) -
  77   75                                  152));
  78   76  #else
  79   77                          return ((float) ilogbf_subnormal(k));
  80   78  #endif
  81   79                  } else
  82   80                          return (-126.F);
  83   81          } else if (k < 0x7f800000)
  84   82                  return ((float) ((k >> 23) - 127));
  85   83          else
  86   84                  return (x * x);
  87   85  }
    
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