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File: [cvs.NetBSD.org] / src / lib / libc / gen / fixunssfsi_ieee754.c (download)

Revision 1.1, Sat Jul 9 02:30:27 2011 UTC (8 years, 5 months ago) by matt
Branch: MAIN
CVS Tags: yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus
Branch point for: yamt-pagecache

Add ieee754 versions of the compiler runtime functions
	__fixuns{sf,df,tf}{si,di}.
Add an ieee754 version of the compiler runtime function __floatuntfdi

/*	$NetBSD: fixunssfsi_ieee754.c,v 1.1 2011/07/09 02:30:27 matt Exp $	*/
/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fixunssfsi_ieee754.c,v 1.1 2011/07/09 02:30:27 matt Exp $");
#endif /* LIBC_SCCS and not lint */

#include <stdbool.h>
#include <stdint.h>
#include <float.h>
#include <machine/ieee.h>

uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *);

uint32_t __fixunssfsi(float);

/*
 * Convert float to (unsigned) int.  All operations are done module 2^32.
 */
uint32_t
__fixunssfsi(float x)
{
	const union ieee_single_u sngu = { .sngu_f = x };
	const uint32_t frac[(SNG_FRACBITS + 31)/32 + 1] = {
		[0] = 0,
		[1] = sngu.sngu_sng.sng_frac,
	};

	return __fixunsgen32(
		sngu.sngu_sng.sng_exp - SNG_EXP_BIAS,
		sngu.sngu_sng.sng_sign != 0,
		FLT_MANT_DIG,
		SNG_FRACBITS,
		&frac[__arraycount(frac)-1]);
}