--- old/usr/src/lib/libm/common/m9x/scalblnl.c
          +++ new/usr/src/lib/libm/common/m9x/scalblnl.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   30  #if defined(ELFOBJ)
  31   31  #pragma weak scalblnl = __scalblnl
  32   32  #endif
  33   33  
  34   34  #include "libm.h"
  35   35  #include <float.h>              /* LDBL_MAX, LDBL_MIN */
  36   36  
  37   37  #if defined(__sparc)

  38   38  #define XSET_EXP(k, x)  ((int *) &x)[0] = (((int *) &x)[0] & ~0x7fff0000) | \
  39   39                                  (k << 16)
  40   40  #define ISINFNANL(k, x) (k == 0x7fff)
  41   41  #define XTWOT_OFFSET    113
  42   42  static const long double xtwot = 10384593717069655257060992658440192.0L,
  43   43                                                                  /* 2^113 */
  44   44          twomtm1 = 4.814824860968089632639944856462318296E-35L;  /* 2^-114 */
  45   45  #elif defined(__x86)
  46   46  #define XSET_EXP(k, x)  ((int *) &x)[2] = (((int *) &x)[2] & ~0x7fff) | k
  47   47  #if defined(HANDLE_UNSUPPORTED)
  48      -#define ISINFNANL(k, x) (k == 0x7fff || k != 0 && \
  49      -                                (((int *) &x)[1] & 0x80000000) == 0)
       48 +#define      ISINFNANL(k, x) (k == 0x7fff || k != 0 && \
       49 +                         (((int *) &x)[1] & 0x80000000) == 0)
  50   50  #else
  51   51  #define ISINFNANL(k, x) (k == 0x7fff)
  52   52  #endif
  53   53  #define XTWOT_OFFSET    64
  54   54  static const long double xtwot = 18446744073709551616.0L,       /* 2^64 */
  55   55          twomtm1 = 2.7105054312137610850186E-20L;                /* 2^-65 */
  56   56  #endif
  57   57  
  58   58  long double
  59   59  scalblnl(long double x, long n) {

  60   60          int k = XBIASED_EXP(x);
  61   61  
  62   62          if (ISINFNANL(k, x))
  63   63                  return (x + x);
  64   64          if (ISZEROL(x) || n == 0)
  65   65                  return (x);
  66   66          if (k == 0) {
  67   67                  x *= xtwot;
  68   68                  k = XBIASED_EXP(x) - XTWOT_OFFSET;
  69   69          }
  70   70          k += (int) n;
  71   71          if (n > 50000 || k > 0x7ffe)
  72   72                  return (LDBL_MAX * copysignl(LDBL_MAX, x));
  73   73          if (n < -50000 || k <= -XTWOT_OFFSET - 1)
  74   74                  return (LDBL_MIN * copysignl(LDBL_MIN, x));
  75   75          if (k > 0) {
  76   76                  XSET_EXP(k, x);
  77   77                  return (x);
  78   78          }
  79   79          k += XTWOT_OFFSET + 1;
  80   80          XSET_EXP(k, x);
  81   81          return (x * twomtm1);
  82   82  }

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