1 /* $NetBSD: fixunsdfsi_ieee754.c,v 1.3 2013/04/30 01:44:07 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: fixunsdfsi_ieee754.c,v 1.3 2013/04/30 01:44:07 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 42 #if defined(SOFTFLOAT) || defined(__ARM_EABI__) 43 #include "softfloat/softfloat-for-gcc.h" 44 #endif 45 46 uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *); 47 48 uint32_t __fixunsdfsi(double); 49 50 /* 51 * Convert double to (unsigned) int. All operations are done module 2^32. 52 */ 53 uint32_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