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/Q/scalbnl.c
          +++ new/usr/src/lib/libm/common/Q/scalbnl.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      -#pragma weak scalbnl = __scalbnl
  32      -#endif
       30 +#pragma weak __scalbnl = scalbnl
  33   31  
  34   32  #include "libm.h"
  35   33  #include <float.h>              /* LDBL_MAX, LDBL_MIN */
  36   34  #include <stdlib.h>             /* abs */
  37   35  
  38   36  #if defined(__sparc)
  39   37  #define XSET_EXP(k, x)  ((int *) &x)[0] = (((int *) &x)[0] & ~0x7fff0000) | \
  40   38                                  (k << 16)
  41   39  #define ISINFNANL(k, x) (k == 0x7fff)
  42   40  #define XTWOT_OFFSET    113

  43   41  static const long double xtwot = 10384593717069655257060992658440192.0L,
  44   42                                                                  /* 2^113 */
  45   43          twomtm1 = 4.814824860968089632639944856462318296E-35L;  /* 2^-114 */
  46   44  #elif defined(__x86)
  47   45  #define XSET_EXP(k, x)  ((int *) &x)[2] = (((int *) &x)[2] & ~0x7fff) | k
  48   46  #if defined(HANDLE_UNSUPPORTED)
  49   47  #define ISINFNANL(k, x) (k == 0x7fff || k != 0 && \
  50   48                                  (((int *) &x)[1] & 0x80000000) == 0)
  51   49  #else
  52   50  #define ISINFNANL(k, x) (k == 0x7fff)
  53   51  #endif
  54   52  #define XTWOT_OFFSET    64
  55   53  static const long double xtwot = 18446744073709551616.0L,       /* 2^64 */
  56   54          twomtm1 = 2.7105054312137610850186E-20L;                /* 2^-65 */
  57   55  #endif
  58   56  
  59   57  long double
  60   58  scalbnl(long double x, int n) {
  61   59          int k = XBIASED_EXP(x);
  62   60  
  63   61          if (ISINFNANL(k, x))
  64   62                  return (x + x);
  65   63          if (ISZEROL(x) || n == 0)
  66   64                  return (x);
  67   65          if (k == 0) {
  68   66                  x *= xtwot;
  69   67                  k = XBIASED_EXP(x) - XTWOT_OFFSET;
  70   68          }
  71   69          if ((unsigned) abs(n) >= 131072)        /* cast to unsigned for -2^31 */
  72   70                  n >>= 1;                /* avoid subsequent integer overflow */
  73   71          k += n;
  74   72          if (k > 0x7ffe)
  75   73                  return (LDBL_MAX * copysignl(LDBL_MAX, x));
  76   74          if (k <= -XTWOT_OFFSET - 1)
  77   75                  return (LDBL_MIN * copysignl(LDBL_MIN, x));
  78   76          if (k > 0) {
  79   77                  XSET_EXP(k, x);
  80   78                  return (x);
  81   79          }
  82   80          k += XTWOT_OFFSET + 1;
  83   81          XSET_EXP(k, x);
  84   82          return (x * twomtm1);
  85   83  }

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