70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/* $NetBSD: fixunsdfsi_ieee754.c,v 1.3 2013/04/30 01:44:07 matt Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: fixunsdfsi_ieee754.c,v 1.3 2013/04/30 01:44:07 matt Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <stdbool.h>
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#include <stdint.h>
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#include <float.h>
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#include <machine/ieee.h>
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#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
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#include "softfloat/softfloat-for-gcc.h"
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#endif
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uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *);
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uint32_t __fixunsdfsi(double);
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/*
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* Convert double to (unsigned) int. All operations are done module 2^32.
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*/
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uint32_t
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__fixunsdfsi(double x)
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{
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const union ieee_double_u dblu = { .dblu_d = x };
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const uint32_t frac[(DBL_FRACBITS + 31)/32 + 1] = {
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[0] = 0,
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[1] = dblu.dblu_dbl.dbl_fracl,
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[2] = dblu.dblu_dbl.dbl_frach,
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};
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return __fixunsgen32(
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dblu.dblu_dbl.dbl_exp - DBL_EXP_BIAS,
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dblu.dblu_dbl.dbl_sign != 0,
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DBL_MANT_DIG,
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DBL_FRACHBITS,
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&frac[__arraycount(frac)-1]);
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}
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