1 /* $NetBSD: fixunstfdi_ieee754.c,v 1.1 2011/07/09 02:30:27 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: fixunstfdi_ieee754.c,v 1.1 2011/07/09 02:30:27 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(__x86_64__) || defined(__i486__) 43 #define FIXUNS __fixunsxfdi 44 #else 45 #define FIXUNS __fixunstfdi 46 #endif 47 48 uint64_t __fixunsgen64(int, bool, size_t, size_t, const uint32_t *); 49 50 uint64_t FIXUNS(long double); 51 52 /* 53 * Convert long double to uint64_t. All operations are done module 2^64. 54 */ 55 uint64_t 56 FIXUNS(long double x) 57 { 58 const union ieee_ext_u extu = { .extu_ld = x }; 59 uint32_t frac[(EXT_FRACBITS + 31)/32 + 2]; 60 61 frac[0] = 0; 62 frac[1] = 0; 63 64 EXT_TO_ARRAY32(extu, &frac[2]); 65 66 return __fixunsgen64( 67 extu.extu_ext.ext_exp - EXT_EXP_BIAS, 68 extu.extu_ext.ext_sign != 0, 69 LDBL_MANT_DIG, 70 EXT_FRACHBITS, 71 &frac[__arraycount(frac)-1]); 72 } 73