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>

*** 25,42 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #if defined(ELFOBJ)
! #pragma weak ilogb = __ilogb
! #endif
  
  #include "libm.h"
  #include "xpg6.h"       /* __xpg6 */
  
! #if defined(USE_FPSCALE) || defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * v: high part of a non-zero subnormal |x|; w: low part of |x|
   */
--- 25,40 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __ilogb = ilogb
  
  #include "libm.h"
  #include "xpg6.h"       /* __xpg6 */
  
! #if defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * v: high part of a non-zero subnormal |x|; w: low part of |x|
   */
*** 55,65 ****
          if (v & 0xf0)
                  r += 4, v >>= 4;
          v <<= 1;
          return (r + ((0xffffaa50 >> v) & 0x3));
  }
! #endif  /* defined(USE_FPSCALE) */
  
  static int
  raise_invalid(int v) {  /* SUSv3 requires ilogb(0,+/-Inf,NaN) raise invalid */
  #ifndef lint
          if ((__xpg6 & _C99SUSv3_ilogb_0InfNaN_raises_invalid) != 0) {
--- 53,63 ----
          if (v & 0xf0)
                  r += 4, v >>= 4;
          v <<= 1;
          return (r + ((0xffffaa50 >> v) & 0x3));
  }
! #endif  /* defined(__x86) */
  
  static int
  raise_invalid(int v) {  /* SUSv3 requires ilogb(0,+/-Inf,NaN) raise invalid */
  #ifndef lint
          if ((__xpg6 & _C99SUSv3_ilogb_0InfNaN_raises_invalid) != 0) {
*** 78,88 ****
  
          if (k < 0x00100000) {
                  if ((px[LOWORD] | k) == 0)
                          return (raise_invalid(0x80000001));
                  else {
! #if defined(USE_FPSCALE) || defined(__x86)
                          x *= two52;
                          return (((px[HIWORD] & 0x7ff00000) >> 20) - 1075);
  #else
                          return (ilogb_subnormal(k, px[LOWORD]));
  #endif
--- 76,86 ----
  
          if (k < 0x00100000) {
                  if ((px[LOWORD] | k) == 0)
                          return (raise_invalid(0x80000001));
                  else {
! #if defined(__x86)
                          x *= two52;
                          return (((px[HIWORD] & 0x7ff00000) >> 20) - 1075);
  #else
                          return (ilogb_subnormal(k, px[LOWORD]));
  #endif