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 2006 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __cexpl = cexpl
  32 
  33 #include "libm.h"       /* expl/isinfl/iszerol/scalbnl/sincosl */
  34 #include "complex_wrapper.h"
  35 
  36 extern int isinfl(long double);
  37 extern int iszerol(long double);
  38 
  39 static const long double zero = 0.0L;
  40 
  41 
  42 ldcomplex
  43 cexpl(ldcomplex z)
  44 {
  45         ldcomplex ans;
  46         long double x, y, t, c, s;
  47         int n, ix, iy, hx, hy;
  48 
  49         x = LD_RE(z);
  50         y = LD_IM(z);
  51         hx = HI_XWORD(x);
  52         hy = HI_XWORD(y);
  53         ix = hx & 0x7fffffff;
  54         iy = hy & 0x7fffffff;
  55 
  56         if (iszerol(y)) {               /* y = 0 */
  57                 LD_RE(ans) = expl(x);
  58                 LD_IM(ans) = y;
  59         } else if (isinfl(x)) {         /* x is +-inf */
  60                 if (hx < 0) {
  61                         if (iy >= 0x7fff0000) {
  62                                 LD_RE(ans) = zero;
  63                                 LD_IM(ans) = zero;
  64                         } else {
  65                                 sincosl(y, &s, &c);
  66                                 LD_RE(ans) = zero * c;
  67                                 LD_IM(ans) = zero * s;
  68                         }
  69                 } else {
  70                         if (iy >= 0x7fff0000) {
  71                                 LD_RE(ans) = x;
  72                                 LD_IM(ans) = y - y;
  73                         } else {
  74                                 (void) sincosl(y, &s, &c);
  75                                 LD_RE(ans) = x * c;
  76                                 LD_IM(ans) = x * s;
  77                         }
  78                 }
  79         } else {
  80                 (void) sincosl(y, &s, &c);
  81 
  82                 if (ix >= 0x400C62E4) {      /* |x| > 11356.52... ~ log(2**16384) */
  83                         t = __k_cexpl(x, &n);
  84                         LD_RE(ans) = scalbnl(t * c, n);
  85                         LD_IM(ans) = scalbnl(t * s, n);
  86                 } else {
  87                         t = expl(x);
  88                         LD_RE(ans) = t * c;
  89                         LD_IM(ans) = t * s;
  90                 }
  91         }
  92 
  93         return (ans);
  94 }