cproj.c revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __cproj = cproj
/* INDENT OFF */
/*
* dcomplex cproj(dcomplex z);
*
* If one of the component of z = (x,y) is an inf, then
* cproj(z) = (+inf, copysign(0,y));
* otherwise,
* cproj(z) = z
*/
/* INDENT ON */
#include "libm.h" /* fabs */
#include "complex_wrapper.h"
static const double zero = 0.0;
dcomplex
cproj(dcomplex z) {
double x, y;
int ix, iy, hx, hy, lx, ly;
x = D_RE(z);
y = D_IM(z);
hx = HI_WORD(x);
lx = LO_WORD(x);
hy = HI_WORD(y);
ly = LO_WORD(y);
ix = hx & 0x7fffffff;
iy = hy & 0x7fffffff;
if (ISINF(iy, ly)) {
D_RE(z) = fabs(y);
D_IM(z) = hy >= 0 ? zero : -zero;
} else if (ISINF(ix, lx)) {
D_RE(z) = fabs(x);
D_IM(z) = hy >= 0 ? zero : -zero;
}
return (z);
}