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/nexttowardl.c
          +++ new/usr/src/lib/libm/common/m9x/nexttowardl.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 nexttowardl = __nexttowardl
  32      -#endif
       30 +#pragma weak __nexttowardl = nexttowardl
  33   31  
  34   32  #include "libm.h"
  35   33  #include <float.h>              /* LDBL_MAX, LDBL_MIN */
  36   34  
  37   35  #if defined(__sparc)
  38   36  #define n0      0
  39   37  #define n1      1
  40   38  #define n2      2
  41   39  #define n3      3
  42   40  #define X86PDNRM1(x)

  43   41  #define INC(px) { \
  44   42                          if (++px[n3] == 0) \
  45   43                                  if (++px[n2] == 0) \
  46   44                                          if (++px[n1] == 0) \
  47   45                                                  ++px[n0]; \
  48   46                  }
  49   47  #define DEC(px) { \
  50   48                          if (--px[n3] == 0xffffffff) \
  51   49                                  if (--px[n2] == 0xffffffff) \
  52   50                                          if (--px[n1] == 0xffffffff) \
  53   51                                                  --px[n0]; \
  54   52                  }
  55   53  #elif defined(__x86)
  56   54  #define n0      2
  57   55  #define n1      1
  58   56  #define n2      0
  59   57  #define n3      0
  60   58  /*
  61   59   * if pseudo-denormal, replace by the equivalent normal
  62   60   */
  63   61  #define X86PDNRM1(x)    if (XBIASED_EXP(x) == 0 && (((int *) &x)[1] & \
  64   62                                  0x80000000) != 0) \
  65   63                                  ((int *) &x)[2] |= 1
  66   64  #define INC(px) { \
  67   65                          if (++px[n2] == 0) \
  68   66                                  if ((++px[n1] & ~0x80000000) == 0) \
  69   67                                          px[n1] = 0x80000000, ++px[n0]; \
  70   68                  }
  71   69  #define DEC(px) { \
  72   70                          if (--px[n2] == 0xffffffff) \
  73   71                                  if (--px[n1] == 0x7fffffff) \
  74   72                                          if ((--px[n0] & 0x7fff) != 0) \
  75   73                                                  px[n1] |= 0x80000000; \
  76   74                  }
  77   75  #endif
  78   76  
  79   77  long double
  80   78  nexttowardl(long double x, long double y) {
  81   79          int *px = (int *) &x;
  82   80          int *py = (int *) &y;
  83   81  
  84   82          if (x == y)
  85   83                  return (y);             /* C99 requirement */
  86   84          if (x != x || y != y)
  87   85                  return (x * y);
  88   86  
  89   87          if (ISZEROL(x)) {       /* x == 0.0 */
  90   88                  px[n0] = py[n0] & XSGNMSK;
  91   89                  px[n1] = px[n2] = 0;
  92   90                  px[n3] = 1;
  93   91          } else {
  94   92                  X86PDNRM1(x);
  95   93                  if ((px[n0] & XSGNMSK) == 0) {  /* x > 0.0 */
  96   94                          if (x > y)      /* x > y */
  97   95                                  DEC(px)
  98   96                          else
  99   97                                  INC(px)
 100   98                  } else {
 101   99                          if (x < y)      /* x < y */
 102  100                                  DEC(px)
 103  101                          else
 104  102                                  INC(px)
 105  103                  }
 106  104          }
 107  105  #ifndef lint
 108  106          {
 109  107                  volatile long double dummy;
 110  108                  int k = XBIASED_EXP(x);
 111  109  
 112  110                  if (k == 0)
 113  111                          dummy = LDBL_MIN * copysignl(LDBL_MIN, x);
 114  112                  else if (k == 0x7fff)
 115  113                          dummy = LDBL_MAX * copysignl(LDBL_MAX, x);
 116  114          }
 117  115  #endif
 118  116          return (x);
 119  117  }

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