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