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 #include "math_private.h" 30 #include "fpmath.h" 31 32 /* Provided by libc */ 33 #if 1 34 DLLEXPORT int 35 (isinf) (double d) 36 { 37 union IEEEd2bits u; 38 39 u.d = d; 40 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0); 41 } 42 #endif 43 44 DLLEXPORT int 45 __isinff(float f) 46 { 47 union IEEEf2bits u; 48 49 u.f = f; 50 return (u.bits.exp == 255 && u.bits.man == 0); 51 } 52 53 #ifdef LONG_DOUBLE 54 DLLEXPORT int 55 __isinfl(long double e) 56 { 57 union IEEEl2bits u; 58 59 u.e = e; 60 mask_nbit_l(u); 61 return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0); 62 } 63 #endif 64 65 __weak_reference(__isinff, isinff); 66