usr/src/lib/libm/common/complex/cprojl.c

   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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29
  30 #pragma weak __cprojl = cprojl
  31
  32 #include "libm.h"               /* fabsl */
  33 #include "complex_wrapper.h"
  34 #include "longdouble.h"
  35
  36 /* INDENT OFF */
  37 static const long double zero = 0.0L;
  38 /* INDENT ON */
  39
  40 ldcomplex
  41 cprojl(ldcomplex z) {
  42         long double x, y;
  43         int hy;
  44
  45         x = LD_RE(z);
  46         y = LD_IM(z);
  47 #if defined(__x86)
  48         hy = ((int *) &y)[2] << 16;
  49 #else
  50         hy = ((int *) &y)[0];
  51 #endif
  52         if (isinfl(y)) {
  53                 LD_RE(z) = fabsl(y);
  54                 LD_IM(z) = hy >= 0 ? zero : -zero;
  55         } else if (isinfl(x)) {
  56                 LD_RE(z) = fabsl(x);
  57                 LD_IM(z) = hy >= 0 ? zero : -zero;
  58         }
  59         return (z);
  60 }