1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __clogf = clogf
  32 
  33 #include "libm.h"
  34 #include "complex_wrapper.h"
  35 
  36 #if defined(__i386) && !defined(__amd64)
  37 extern int __swapRP(int);
  38 #endif
  39 
  40 fcomplex
  41 clogf(fcomplex z)
  42 {
  43         fcomplex ans;
  44         float x, y, ax, ay;
  45         double dx, dy;
  46         int ix, iy, hx, hy;
  47 
  48         x = F_RE(z);
  49         y = F_IM(z);
  50         hx = THE_WORD(x);
  51         hy = THE_WORD(y);
  52         ix = hx & 0x7fffffff;
  53         iy = hy & 0x7fffffff;
  54         ay = fabsf(y);
  55         ax = fabsf(x);
  56         F_IM(ans) = atan2f(y, x);
  57 
  58         if (ix >= 0x7f800000 || iy >= 0x7f800000) {
  59                 /* x or y is Inf or NaN */
  60                 if (iy == 0x7f800000)
  61                         F_RE(ans) = ay;
  62                 else if (ix == 0x7f800000)
  63                         F_RE(ans) = ax;
  64                 else
  65                         F_RE(ans) = ax + ay;
  66         } else {
  67 #if defined(__i386) && !defined(__amd64)
  68                 int rp = __swapRP(fp_extended);
  69 #endif
  70                 dx = (double)ax;
  71                 dy = (double)ay;
  72 
  73                 if (ix == 0x3f800000)
  74                         F_RE(ans) = (float)(0.5 * log1p(dy * dy));
  75                 else if (iy == 0x3f800000)
  76                         F_RE(ans) = (float)(0.5 * log1p(dx * dx));
  77                 else if ((ix | iy) == 0)
  78                         F_RE(ans) = -1.0f / ax;
  79                 else
  80                         F_RE(ans) = (float)(0.5 * log(dx * dx + dy * dy));
  81 
  82 #if defined(__i386) && !defined(__amd64)
  83                 if (rp != fp_extended)
  84                         (void) __swapRP(rp);
  85 #endif
  86         }
  87 
  88         return (ans);
  89 }