1 /*- 2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <openlibm.h> 29 30 #include "fpmath.h" 31 32 int 33 __fpclassifyd(double d) 34 { 35 union IEEEd2bits u; 36 37 u.d = d; 38 if (u.bits.exp == 2047) { 39 if (u.bits.manl == 0 && u.bits.manh == 0) { 40 return FP_INFINITE; 41 } else { 42 return FP_NAN; 43 } 44 } else if (u.bits.exp != 0) { 45 return FP_NORMAL; 46 } else if (u.bits.manl == 0 && u.bits.manh == 0) { 47 return FP_ZERO; 48 } else { 49 return FP_SUBNORMAL; 50 } 51 } 52 53 54 int 55 __fpclassifyf(float f) 56 { 57 union IEEEf2bits u; 58 59 u.f = f; 60 if (u.bits.exp == 255) { 61 if (u.bits.man == 0) { 62 return FP_INFINITE; 63 } else { 64 return FP_NAN; 65 } 66 } else if (u.bits.exp != 0) { 67 return FP_NORMAL; 68 } else if (u.bits.man == 0) { 69 return FP_ZERO; 70 } else { 71 return FP_SUBNORMAL; 72 } 73 } 74 75 int 76 __fpclassifyl(long double e) 77 { 78 union IEEEl2bits u; 79 80 u.e = e; 81 mask_nbit_l(u); 82 if (u.bits.exp == 32767) { 83 if (u.bits.manl == 0 && u.bits.manh == 0) { 84 return FP_INFINITE; 85 } else { 86 return FP_NAN; 87 } 88 } else if (u.bits.exp != 0) { 89 return FP_NORMAL; 90 } else if (u.bits.manl == 0 && u.bits.manh == 0) { 91 return FP_ZERO; 92 } else { 93 return FP_SUBNORMAL; 94 } 95 } 96 97 98