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/R/scalbnf.c
          +++ new/usr/src/lib/libm/common/R/scalbnf.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 scalbnf = __scalbnf
  32      -#endif
       30 +#pragma weak __scalbnf = scalbnf
  33   31  
  34   32  #include "libm.h"
  35   33  #include <float.h>              /* FLT_MAX, FLT_MIN */
  36   34  #include <stdlib.h>             /* abs */
  37   35  
  38   36  static const float twom25f = 2.98023223876953125e-8F;
  39      -#if defined(USE_FPSCALE) || defined(__x86)
       37 +#if defined(__x86)
  40   38  static const float two23f = 8388608.0F;
  41   39  #else
  42   40  /*
  43   41   * v: a non-zero subnormal |x|; returns [-22, 0]
  44   42   */
  45   43  static int
  46   44  ilogbf_biased(unsigned v) {
  47   45          int r = -22;
  48   46  
  49   47          if (v & 0xffff0000)
  50   48                  r += 16, v >>= 16;
  51   49          if (v & 0xff00)
  52   50                  r += 8, v >>= 8;
  53   51          if (v & 0xf0)
  54   52                  r += 4, v >>= 4;
  55   53          v <<= 1;
  56   54          return (r + ((0xffffaa50 >> v) & 0x3));
  57   55  }
  58      -#endif  /* defined(USE_FPSCALE) */
       56 +#endif  /* defined(__x86) */
  59   57  
  60   58  float
  61   59  scalbnf(float x, int n) {
  62   60          int *px = (int *) &x, ix, k;
  63   61  
  64   62          ix = *px & ~0x80000000;
  65   63          k = ix >> 23;
  66   64          if (k == 0xff)
  67   65  #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
  68   66                  return (ix > 0x7f800000 ? x * x : x);
  69   67  #else
  70   68                  return (x + x);
  71   69  #endif
  72   70          if (ix == 0 || n == 0)
  73   71                  return (x);
  74   72          if (k == 0) {
  75      -#if defined(USE_FPSCALE) || defined(__x86)
       73 +#if defined(__x86)
  76   74                  x *= two23f;
  77   75                  k = ((*px & ~0x80000000) >> 23) - 23;
  78   76  #else
  79   77                  k = ilogbf_biased(ix);
  80   78                  *px = (*px & 0x80000000) | (ix << (-k + 1));
  81   79  #endif
  82   80          }
  83   81          if ((unsigned) abs(n) >= 131072)        /* cast to unsigned for -2^31 */
  84   82                  n >>= 1;                /* avoid subsequent integer overflow */
  85   83          k += n;

  86   84          if (k > 0xfe)
  87   85                  return (FLT_MAX * copysignf(FLT_MAX, x));
  88   86          if (k <= -25)
  89   87                  return (FLT_MIN * copysignf(FLT_MIN, x));
  90   88          if (k > 0) {
  91   89                  *px = (*px & ~0x7f800000) | (k << 23);
  92   90                  return (x);
  93   91          }
  94   92          k += 25;
  95   93          *px = (*px & ~0x7f800000) | (k << 23);
  96   94          return (x * twom25f);
  97   95  }

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