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>

          --- old/usr/src/lib/libm/common/R/scalbf.c
          +++ new/usr/src/lib/libm/common/R/scalbf.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   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23   23   */
  24   24  /*
  25   25   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26   26   * Use is subject to license terms.
  27   27   */
  28   28  
  29      -#pragma weak scalbf = __scalbf
       29 +#pragma weak __scalbf = scalbf
  30   30  
  31   31  #include "libm.h"
  32   32  
  33   33  float
  34   34  scalbf(float x, float y) {
  35   35          int     ix, iy, hx, hy, n;
  36   36  
  37   37          ix = *(int *)&x;
  38   38          iy = *(int *)&y;
  39   39          hx = ix & ~0x80000000;

  40   40          hy = iy & ~0x80000000;
  41   41  
  42   42          if (hx > 0x7f800000 || hy >= 0x7f800000) {
  43   43                  /* x is nan or y is inf or nan */
  44   44                  return ((iy < 0)? x / -y : x * y);
  45   45          }
  46   46  
  47   47          /* see if y is an integer without raising inexact */
  48   48          if (hy >= 0x4b000000) {
  49   49                  /* |y| >= 2^23, so it must be an integer */
  50   50                  n = (iy < 0)? -65000 : 65000;
  51   51          } else if (hy < 0x3f800000) {
  52   52                  /* |y| < 1, so it must be zero or non-integer */
  53   53                  return ((hy == 0)? x : (x - x) / (x - x));
  54   54          } else {
  55   55                  if (hy & ((1 << (0x96 - (hy >> 23))) - 1))
  56   56                          return ((y - y) / (y - y));
  57   57                  n = (int)y;
  58   58          }
  59   59          return (scalbnf(x, n));
  60   60  }

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