Annotation of src/lib/libc/gen/isnanf_ieee754.c, Revision 1.1
1.1 ! kleink 1: /* $NetBSD$ */
! 2:
! 3: /*
! 4: * Copyright (c) 1992, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This software was developed by the Computer Systems Engineering group
! 8: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 9: * contributed to Berkeley.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
! 36: */
! 37:
! 38: #include <sys/cdefs.h>
! 39: #if defined(LIBC_SCCS) && !defined(lint)
! 40: #if 0
! 41: static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93";
! 42: #else
! 43: __RCSID("$NetBSD$");
! 44: #endif
! 45: #endif /* LIBC_SCCS and not lint */
! 46:
! 47: #include <machine/ieee.h>
! 48: #include <math.h>
! 49:
! 50: /*
! 51: * 7.12.3.4 isnan - test for a NaN
! 52: * IEEE 754 single-precision version
! 53: */
! 54: int
! 55: __isnanf(float x)
! 56: {
! 57: union ieee_single_u u;
! 58:
! 59: u.sngu_f = x;
! 60:
! 61: return (u.sngu_sng.sng_exp == SNG_EXP_INFNAN &&
! 62: u.sngu_sng.sng_frac != 0);
! 63: }
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