1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <machine/float.h> 30 31 #include <math.h> 32 33 #include "fpmath.h" 34 35 /* 36 * XXX These routines belong in libm, but they must remain in libc for 37 * binary compat until we can bump libm's major version number. 38 */ 39 40 __weak_reference(__isinf, isinf); 41 42 int 43 __isinf(double d) 44 { 45 union IEEEd2bits u; 46 47 u.d = d; 48 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0); 49 } 50 51 int 52 __isinff(float f) 53 { 54 union IEEEf2bits u; 55 56 u.f = f; 57 return (u.bits.exp == 255 && u.bits.man == 0); 58 } 59 60 int 61 __isinfl(long double e) 62 { 63 union IEEEl2bits u; 64 65 u.e = e; 66 mask_nbit_l(u); 67 #if LDBL_MANT_DIG == 53 68 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0); 69 #else 70 return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0); 71 #endif 72 } 73