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/hypotf.c
          +++ new/usr/src/lib/libm/common/R/hypotf.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 hypotf = __hypotf
       30 +#pragma weak __hypotf = hypotf
  31   31  
  32   32  #include "libm.h"
  33   33  
  34   34  float
  35   35  hypotf(float x, float y) {
  36   36          double dx, dy;
  37   37          float w;
  38   38          int ix, iy;
  39   39  
  40   40          ix = (*(int *) &x) & 0x7fffffff;

  41   41          iy = (*(int *) &y) & 0x7fffffff;
  42   42          if (ix >= 0x7f800000) {
  43   43                  if (ix == 0x7f800000)
  44   44                          *(int *) &w = x == y ? iy : ix; /* w = |x| = inf */
  45   45                  else if (iy == 0x7f800000)
  46   46                          *(int *) &w = x == y ? ix : iy; /* w = |y| = inf */
  47   47                  else
  48   48                          w = fabsf(x) * fabsf(y);        /* + -> * for Cheetah */
  49   49          } else if (iy >= 0x7f800000) {
  50   50                  if (iy == 0x7f800000)
  51   51                          *(int *) &w = x == y ? ix : iy; /* w = |y| = inf */
  52   52                  else
  53   53                          w = fabsf(x) * fabsf(y);        /* + -> * for Cheetah */
  54   54          } else if (ix == 0)
  55   55                  *(int *) &w = iy;       /* w = |y|  */
  56   56          else if (iy == 0)
  57   57                  *(int *) &w = ix;       /* w = |x|  */
  58   58          else {
  59   59                  dx = (double) x;
  60   60                  dy = (double) y;
  61   61                  w = (float) sqrt(dx * dx + dy * dy);
  62   62          }
  63   63          return (w);
  64   64  }

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