usr/src/lib/libm/common/complex/cprojf.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 __cprojf = cprojf
  31
  32 #include "libm.h"
  33 #include "complex_wrapper.h"
  34
  35 /* INDENT OFF */
  36 static const float zero = 0.0F;
  37 /* INDENT ON */
  38
  39 fcomplex
  40 cprojf(fcomplex z) {
  41         float x, y;
  42         int ix, iy, hx, hy;
  43
  44         x = F_RE(z);
  45         y = F_IM(z);
  46         hx = THE_WORD(x);
  47         hy = THE_WORD(y);
  48         ix = hx & 0x7fffffff;
  49         iy = hy & 0x7fffffff;
  50         if (iy == 0x7f800000) {
  51                 F_RE(z) = fabsf(y);
  52                 F_IM(z) = hy >= 0 ? zero : -zero;
  53         } else if (ix == 0x7f800000) {
  54                 F_RE(z) = fabsf(x);
  55                 F_IM(z) = hy >= 0 ? zero : -zero;
  56         }
  57         return (z);
  58 }