1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> 5 * Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <sys/endian.h> 33 34 #include <machine/float.h> 35 36 #include <math.h> 37 #include <stdint.h> 38 39 #include "fpmath.h" 40 41 int 42 __fpclassifyf(float f) 43 { 44 union IEEEf2bits u; 45 46 u.f = f; 47 if (u.bits.exp == 0) { 48 if (u.bits.man == 0) 49 return (FP_ZERO); 50 return (FP_SUBNORMAL); 51 } 52 if (u.bits.exp == 255) { 53 if (u.bits.man == 0) 54 return (FP_INFINITE); 55 return (FP_NAN); 56 } 57 return (FP_NORMAL); 58 } 59 60 int 61 __fpclassifyd(double d) 62 { 63 union IEEEd2bits u; 64 65 u.d = d; 66 if (u.bits.exp == 0) { 67 if ((u.bits.manl | u.bits.manh) == 0) 68 return (FP_ZERO); 69 return (FP_SUBNORMAL); 70 } 71 if (u.bits.exp == 2047) { 72 if ((u.bits.manl | u.bits.manh) == 0) 73 return (FP_INFINITE); 74 return (FP_NAN); 75 } 76 return (FP_NORMAL); 77 } 78 79 int 80 __fpclassifyl(long double e) 81 { 82 union IEEEl2bits u; 83 84 u.e = e; 85 if (u.bits.exp == 0) { 86 if ((u.bits.manl | u.bits.manh) == 0) 87 return (FP_ZERO); 88 return (FP_SUBNORMAL); 89 } 90 mask_nbit_l(u); /* Mask normalization bit if applicable. */ 91 #if LDBL_MANT_DIG == 53 92 if (u.bits.exp == 2047) { 93 if ((u.bits.manl | u.bits.manh) == 0) 94 return (FP_INFINITE); 95 return (FP_NAN); 96 } 97 #else 98 if (u.bits.exp == 32767) { 99 if ((u.bits.manl | u.bits.manh) == 0) 100 return (FP_INFINITE); 101 return (FP_NAN); 102 } 103 #endif 104 return (FP_NORMAL); 105 } 106