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/m9x/nearbyint.c
          +++ new/usr/src/lib/libm/common/m9x/nearbyint.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   30  #pragma weak nearbyint = __nearbyint
  32      -#endif
  33   31  
  34   32  /*
  35   33   * nearbyint(x) returns the nearest fp integer to x in the direction
  36   34   * corresponding to the current rounding direction without raising
  37   35   * the inexact exception.
  38   36   *
  39   37   * nearbyint(x) is x unchanged if x is +/-0 or +/-inf.  If x is NaN,
  40   38   * nearbyint(x) is also NaN.
  41   39   */
  42   40  
  43   41  #include "libm.h"
  44      -#include "fenv_synonyms.h"
  45   42  #include <fenv.h>
  46   43  
  47   44  double
  48   45  __nearbyint(double x) {
  49   46          union {
  50   47                  unsigned i[2];
  51   48                  double d;
  52   49          } xx;
  53   50          unsigned hx, sx, i, frac;
  54   51          int rm, j;

  55   52  
  56   53          xx.d = x;
  57   54          sx = xx.i[HIWORD] & 0x80000000;
  58   55          hx = xx.i[HIWORD] & ~0x80000000;
  59   56  
  60   57          /* handle trivial cases */
  61   58          if (hx >= 0x43300000) { /* x is nan, inf, or already integral */
  62   59                  if (hx >= 0x7ff00000)   /* x is inf or nan */
  63   60  #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
  64   61                          return (hx >= 0x7ff80000 ? x : x + x);
  65   62                          /* assumes sparc-like QNaN */
  66   63  #else
  67   64                          return (x + x);
  68   65  #endif
  69   66                  return (x);
  70   67          } else if ((hx | xx.i[LOWORD]) == 0)    /* x is zero */
  71   68                  return (x);
  72   69  
  73   70          /* get the rounding mode */
  74   71          rm = fegetround();
  75   72  
  76   73          /* flip the sense of directed roundings if x is negative */
  77   74          if (sx && (rm == FE_UPWARD || rm == FE_DOWNWARD))
  78   75                  rm = (FE_UPWARD + FE_DOWNWARD) - rm;
  79   76  
  80   77          /* handle |x| < 1 */
  81   78          if (hx < 0x3ff00000) {
  82   79                  if (rm == FE_UPWARD || (rm == FE_TONEAREST &&
  83   80                          (hx >= 0x3fe00000 && ((hx & 0xfffff) | xx.i[LOWORD]))))
  84   81                          xx.i[HIWORD] = sx | 0x3ff00000;
  85   82                  else
  86   83                          xx.i[HIWORD] = sx;
  87   84                  xx.i[LOWORD] = 0;
  88   85                  return (xx.d);
  89   86          }
  90   87  
  91   88          /* round x at the integer bit */
  92   89          j = 0x433 - (hx >> 20);
  93   90          if (j >= 32) {
  94   91                  i = 1 << (j - 32);
  95   92                  frac = ((xx.i[HIWORD] << 1) << (63 - j)) |
  96   93                          (xx.i[LOWORD] >> (j - 32));
  97   94                  if (xx.i[LOWORD] & (i - 1))
  98   95                          frac |= 1;
  99   96                  if (!frac)
 100   97                          return (x);
 101   98                  xx.i[LOWORD] = 0;
 102   99                  xx.i[HIWORD] &= ~(i - 1);
 103  100                  if ((rm == FE_UPWARD) || ((rm == FE_TONEAREST) &&
 104  101                          ((frac > 0x80000000u) || ((frac == 0x80000000) &&
 105  102                          (xx.i[HIWORD] & i)))))
 106  103                          xx.i[HIWORD] += i;
 107  104          } else {
 108  105                  i = 1 << j;
 109  106                  frac = (xx.i[LOWORD] << 1) << (31 - j);
 110  107                  if (!frac)
 111  108                          return (x);
 112  109                  xx.i[LOWORD] &= ~(i - 1);
 113  110                  if ((rm == FE_UPWARD) || ((rm == FE_TONEAREST) &&
 114  111                          (frac > 0x80000000u || ((frac == 0x80000000) &&
 115  112                          (xx.i[LOWORD] & i))))) {
 116  113                          xx.i[LOWORD] += i;
 117  114                          if (xx.i[LOWORD] == 0)
 118  115                                  xx.i[HIWORD]++;
 119  116                  }
 120  117          }
 121  118          return (xx.d);
 122  119  }

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