5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local

*** 34,44 ****
          one     = 1.0,
          huge    = 1.0e300,
          tiny    = 1.0e-300,
          twom54  = 5.5511151231257827021181583404541015625e-17;
  
! #if defined(USE_FPSCALE) || defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * Normalize non-zero subnormal x and return biased exponent of x in [-51,0]
   */
--- 34,44 ----
          one     = 1.0,
          huge    = 1.0e300,
          tiny    = 1.0e-300,
          twom54  = 5.5511151231257827021181583404541015625e-17;
  
! #if defined(__x86)
  static const double two52 = 4503599627370496.0;
  #else
  /*
   * Normalize non-zero subnormal x and return biased exponent of x in [-51,0]
   */
*** 68,78 ****
          }
          px[HIWORD] = (px[HIWORD] & 0x80000000) | v;
          px[LOWORD] = w;
          return (1 - s);
  }
! #endif  /* defined(USE_FPSCALE) */
  
  double
  scalbn(double x, int n) {
          int     *px, ix, hx, k;
  
--- 68,78 ----
          }
          px[HIWORD] = (px[HIWORD] & 0x80000000) | v;
          px[LOWORD] = w;
          return (1 - s);
  }
! #endif  /* defined(__x86) */
  
  double
  scalbn(double x, int n) {
          int     *px, ix, hx, k;
  
*** 85,95 ****
                  return (x * one);
  
          if (k == 0) {
                  if ((hx | px[LOWORD]) == 0 || n == 0)
                          return (x);
! #if defined(USE_FPSCALE) || defined(__x86)
                  x *= two52;
                  ix = px[HIWORD];
                  k = ((ix & ~0x80000000) >> 20) - 52;
  #else
                  k = ilogb_biased((unsigned *)px);
--- 85,95 ----
                  return (x * one);
  
          if (k == 0) {
                  if ((hx | px[LOWORD]) == 0 || n == 0)
                          return (x);
! #if defined(__x86)
                  x *= two52;
                  ix = px[HIWORD];
                  k = ((ix & ~0x80000000) >> 20) - 52;
  #else
                  k = ilogb_biased((unsigned *)px);