1/* $NetBSD: fixunsdfdi.c,v 1.8 2011/07/04 06:23:50 matt Exp $ */ 2/*- 3 * Copyright (c) 2011 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Matt Thomas of 3am Software Foundry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32 33#if defined(LIBC_SCCS) && !defined(lint) 34__RCSID("$NetBSD: fixunsdfdi.c,v 1.8 2011/07/04 06:23:50 matt Exp $"); 35#endif /* LIBC_SCCS and not lint */ 36 37#include <stdbool.h> 38#include <stdint.h> 39#include <float.h> 40#include <machine/ieee.h> 41 42uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *); 43 44uint32_t __fixunsdfsi(double); 45 46/* 47 * Convert double to (unsigned) int. All operations are done module 2^32. 48 */ 49uint32_t 50__fixunsdfsi(double x) 51{ 52 const union ieee_double_u dblu = { .dblu_d = x }; 53 const uint32_t frac[(DBL_FRACBITS + 31)/32 + 1] = { 54 [0] = 0, 55 [1] = dblu.dblu_dbl.dbl_fracl, 56 [2] = dblu.dblu_dbl.dbl_frach, 57 }; 58 59 return __fixunsgen32( 60 dblu.dblu_dbl.dbl_exp - DBL_EXP_BIAS, 61 dblu.dblu_dbl.dbl_sign != 0, 62 DBL_MANT_DIG, 63 DBL_FRACHBITS, 64 &frac[__arraycount(frac)-1]); 65} 66