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/complex/csqrtf.c
          +++ new/usr/src/lib/libm/common/complex/csqrtf.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 csqrtf = __csqrtf
       30 +#pragma weak __csqrtf = csqrtf
  31   31  
  32   32  #include "libm.h"               /* sqrt/fabsf/sqrtf */
  33   33  #include "complex_wrapper.h"
  34   34  
  35   35  /* INDENT OFF */
  36   36  static const float zero = 0.0F;
  37   37  /* INDENT ON */
  38   38  
  39   39  fcomplex
  40   40  csqrtf(fcomplex z) {

  41   41          fcomplex ans;
  42   42          double dt, dx, dy;
  43   43          float x, y, t, ax, ay, w;
  44   44          int ix, iy, hx, hy;
  45   45  
  46   46          x = F_RE(z);
  47   47          y = F_IM(z);
  48   48          hx = THE_WORD(x);
  49   49          hy = THE_WORD(y);
  50   50          ix = hx & 0x7fffffff;
  51   51          iy = hy & 0x7fffffff;
  52   52          ay = fabsf(y);
  53   53          ax = fabsf(x);
  54   54          if (ix >= 0x7f800000 || iy >= 0x7f800000) {
  55   55                  /* x or y is Inf or NaN */
  56   56                  if (iy == 0x7f800000)
  57   57                          F_IM(ans) = F_RE(ans) = ay;
  58   58                  else if (ix == 0x7f800000) {
  59   59                          if (hx > 0) {
  60   60                                  F_RE(ans) = ax;
  61   61                                  F_IM(ans) = ay * zero;
  62   62                          } else {
  63   63                                  F_RE(ans) = ay * zero;
  64   64                                  F_IM(ans) = ax;
  65   65                          }
  66   66                  } else
  67   67                          F_IM(ans) = F_RE(ans) = ax + ay;
  68   68          } else if (iy == 0) {
  69   69                  if (hx >= 0) {
  70   70                          F_RE(ans) = sqrtf(ax);
  71   71                          F_IM(ans) = zero;
  72   72                  } else {
  73   73                          F_IM(ans) = sqrtf(ax);
  74   74                          F_RE(ans) = zero;
  75   75                  }
  76   76          } else {
  77   77                  dx = (double) ax;
  78   78                  dy = (double) ay;
  79   79                  dt = sqrt(0.5 * (sqrt(dx * dx + dy * dy) + dx));
  80   80                  t = (float) dt;
  81   81                  w = (float) (dy / (dt + dt));
  82   82                  if (hx >= 0) {
  83   83                          F_RE(ans) = t;
  84   84                          F_IM(ans) = w;
  85   85                  } else {
  86   86                          F_IM(ans) = t;
  87   87                          F_RE(ans) = w;
  88   88                  }
  89   89          }
  90   90          if (hy < 0)
  91   91                  F_IM(ans) = -F_IM(ans);
  92   92          return (ans);
  93   93  }

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