1168404Spjd/* $NetBSD: fixunsdfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 matt Exp $ */ 2168404Spjd/*- 3168404Spjd * Copyright (c) 2011 The NetBSD Foundation, Inc. 4168404Spjd * All rights reserved. 5168404Spjd * 6168792Sru * This code is derived from software contributed to The NetBSD Foundation 7168404Spjd * by Matt Thomas of 3am Software Foundry. 8168792Sru * 9168404Spjd * Redistribution and use in source and binary forms, with or without 10168792Sru * modification, are permitted provided that the following conditions 11168404Spjd * are met: 12168792Sru * 1. Redistributions of source code must retain the above copyright 13168404Spjd * notice, this list of conditions and the following disclaimer. 14168792Sru * 2. Redistributions in binary form must reproduce the above copyright 15168404Spjd * notice, this list of conditions and the following disclaimer in the 16168792Sru * documentation and/or other materials provided with the distribution. 17168404Spjd * 18168792Sru * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19168792Sru * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20168792Sru * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21168792Sru * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22168792Sru * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23168404Spjd * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24168792Sru * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25168792Sru * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26168404Spjd * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27168792Sru * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28168792Sru * POSSIBILITY OF SUCH DAMAGE. 29168792Sru */ 30168792Sru 31168792Sru#include <sys/cdefs.h> 32168792Sru 33168792Sru#if defined(LIBC_SCCS) && !defined(lint) 34168792Sru__RCSID("$NetBSD: fixunsdfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 matt Exp $"); 35168792Sru#endif /* LIBC_SCCS and not lint */ 36168792Sru 37168792Sru#include <stdbool.h> 38168404Spjd#include <stdint.h> 39168792Sru#include <float.h> 40168792Sru#include <machine/ieee.h> 41168404Spjd 42168404Spjd#if defined(SOFTFLOAT) || defined(__ARM_EABI__) 43168404Spjd#include "softfloat/softfloat-for-gcc.h" 44168404Spjd#endif 45168404Spjd 46uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *); 47 48uint32_t __fixunsdfsi(double); 49 50/* 51 * Convert double to (unsigned) int. All operations are done module 2^32. 52 */ 53uint32_t 54__fixunsdfsi(double x) 55{ 56 const union ieee_double_u dblu = { .dblu_d = x }; 57 const uint32_t frac[(DBL_FRACBITS + 31)/32 + 1] = { 58 [0] = 0, 59 [1] = dblu.dblu_dbl.dbl_fracl, 60 [2] = dblu.dblu_dbl.dbl_frach, 61 }; 62 63 return __fixunsgen32( 64 dblu.dblu_dbl.dbl_exp - DBL_EXP_BIAS, 65 dblu.dblu_dbl.dbl_sign != 0, 66 DBL_MANT_DIG, 67 DBL_FRACHBITS, 68 &frac[__arraycount(frac)-1]); 69} 70