5261 libm should stop using synonyms.h

          --- old/usr/src/lib/libm/common/R/ilogbf.c
          +++ new/usr/src/lib/libm/common/R/ilogbf.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      -#pragma weak ilogbf = __ilogbf
       30 +#pragma weak __ilogbf = ilogbf
  31   31  
  32   32  #include "libm.h"
  33   33  #include "xpg6.h"       /* __xpg6 */
  34   34  
  35   35  #if defined(__x86)
  36   36  static const float two25 = 33554432.0F;
  37   37  #else
  38   38  /*
  39   39   * v: a non-zero subnormal |x|
  40   40   */

  41   41  static int
  42   42  ilogbf_subnormal(unsigned v) {
  43   43          int r = -126 - 23;
  44   44  
  45   45          if (v & 0xffff0000)
  46   46                  r += 16, v >>= 16;
  47   47          if (v & 0xff00)
  48   48                  r += 8, v >>= 8;
  49   49          if (v & 0xf0)
  50   50                  r += 4, v >>= 4;
  51   51          v <<= 1;
  52   52          return (r + ((0xffffaa50 >> v) & 0x3));
  53   53  }
  54   54  #endif  /* defined(__x86) */
  55   55  
  56   56  static int
  57   57  raise_invalid(int v) {  /* SUSv3 requires ilogbf(0,+/-Inf,NaN) raise invalid */
  58   58  #ifndef lint
  59   59          if ((__xpg6 & _C99SUSv3_ilogb_0InfNaN_raises_invalid) != 0) {
  60   60                  static const double zero = 0.0;
  61   61                  volatile double dummy;
  62   62  
  63   63                  dummy = zero / zero;
  64   64          }
  65   65  #endif
  66   66          return (v);
  67   67  }
  68   68  
  69   69  int
  70   70  ilogbf(float x) {
  71   71          int k = *((int *) &x) & ~0x80000000;
  72   72  
  73   73          if (k < 0x00800000) {
  74   74                  if (k == 0)
  75   75                          return (raise_invalid(0x80000001));
  76   76                  else {
  77   77  #if defined(__x86)
  78   78                          x *= two25;
  79   79                          return (((*((int *) &x) & 0x7f800000) >> 23) - 152);
  80   80  #else
  81   81                          return (ilogbf_subnormal(k));
  82   82  #endif
  83   83                  }
  84   84          } else if (k < 0x7f800000)
  85   85                  return ((k >> 23) - 127);
  86   86          else
  87   87                  return (raise_invalid(0x7fffffff));
  88   88  }

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