xref: /illumos-gate/usr/src/lib/libc/sparcv9/crt/_ftou.c (revision 1da57d55)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7257d1b4Sraf  * Common Development and Distribution License (the "License").
6*7257d1b4Sraf  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
21*7257d1b4Sraf 
227c478bd9Sstevel@tonic-gate /*
23*7257d1b4Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
27*7257d1b4Sraf #include "lint.h"
287c478bd9Sstevel@tonic-gate #include <sys/types.h>
297c478bd9Sstevel@tonic-gate #include "libc.h"
307c478bd9Sstevel@tonic-gate 
317c478bd9Sstevel@tonic-gate unsigned
__dtou(double d)327c478bd9Sstevel@tonic-gate __dtou(double d)
337c478bd9Sstevel@tonic-gate {
347c478bd9Sstevel@tonic-gate 	/* Convert double to unsigned. */
357c478bd9Sstevel@tonic-gate 
367c478bd9Sstevel@tonic-gate 	int id;
377c478bd9Sstevel@tonic-gate 
387c478bd9Sstevel@tonic-gate 	/*
397c478bd9Sstevel@tonic-gate 	 * id = d is correct if 0 <= d < 2**31, and good enough if d is NaN
407c478bd9Sstevel@tonic-gate 	 * or d < 0 or d >= 2**32.  Otherwise, since the result (int)d of
417c478bd9Sstevel@tonic-gate 	 * converting 2**31 <= d < 2**32 is unknown, adjust d before the
427c478bd9Sstevel@tonic-gate 	 * conversion.
437c478bd9Sstevel@tonic-gate 	 */
447c478bd9Sstevel@tonic-gate 
457c478bd9Sstevel@tonic-gate 	if (d >= 2147483648.0)
467c478bd9Sstevel@tonic-gate 		id = 0x80000000 | (int)(d - 2147483648.0);
477c478bd9Sstevel@tonic-gate 	else
487c478bd9Sstevel@tonic-gate 		id = (int)d;
497c478bd9Sstevel@tonic-gate 	return ((unsigned)id);
507c478bd9Sstevel@tonic-gate }
517c478bd9Sstevel@tonic-gate 
527c478bd9Sstevel@tonic-gate unsigned
__ftou(float d)537c478bd9Sstevel@tonic-gate __ftou(float d)
547c478bd9Sstevel@tonic-gate {
557c478bd9Sstevel@tonic-gate 	/* Convert float to unsigned. */
567c478bd9Sstevel@tonic-gate 
577c478bd9Sstevel@tonic-gate 	int id;
587c478bd9Sstevel@tonic-gate 	/*
597c478bd9Sstevel@tonic-gate 	 * id = d is correct if 0 <= d < 2**31, and good enough if d is NaN
607c478bd9Sstevel@tonic-gate 	 * or d < 0 or d >= 2**32.  Otherwise, since the result (int)d of
617c478bd9Sstevel@tonic-gate 	 * converting 2**31 <= d < 2**32 is unknown, adjust d before the
627c478bd9Sstevel@tonic-gate 	 * conversion.
637c478bd9Sstevel@tonic-gate 	 */
647c478bd9Sstevel@tonic-gate 
657c478bd9Sstevel@tonic-gate 	if (d >= 2147483648.0)
667c478bd9Sstevel@tonic-gate 		id = 0x80000000 | (int)(d - 2147483648.0);
677c478bd9Sstevel@tonic-gate 	else
687c478bd9Sstevel@tonic-gate 		id = (int)d;
697c478bd9Sstevel@tonic-gate 	return ((unsigned)id);
707c478bd9Sstevel@tonic-gate }
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