/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /******************************************************************************* * * * File nan.c, * * Function nan. * * * * Copyright © 1991-2001 Apple Computer, Inc. All rights reserved. * * * * Written by A. Sazegari, started on October 1991. * * Modified and ported by Robert A. Murley (ram) for Mac OS X. * * * * A MathLib v4 file. * * * * November 20 2001: <scp> made nan and nanf publically visible again * * November 8 2001: made nan and nanf __private_extern__ to prevent * * conflict with CarbonCore. * * November 6 2001: commented out warning about Intel architectures. * * changed i386 stubs to call abort(). * * November 2 2001: added stubs for i386 routines. * * January 6 1993: changed the value of EPSILON to avoid the denormal * * trap on the 68040. * * September24 1993: took the ̉#include support.hÓ out. * * May 17 1993: changed the routine nan with kurt's help. nan now * * conforms to the nceg specification with some * * restrictions. see below. * * July 28 1993: fixed the problem with nan("+n"), where n ³ 0. * * July 29 1993: completely replaced the program with a new outlook * * using bin2dec functions. * * August 25 1993: added implementation of nanf and nanl. * * April 7 1997: deleted nanl and deferred to AuxiliaryDD.c * * September20 2001: removed calls to binary-decimal converter. * * September25 2001: added ram's name. * * October 08 2001: changed compiler errors to warnings. * * * * W A R N I N G: * * These routines require a 64-bit double precision IEEE-754 model. * * They are written for PowerPC only and are expecting the compiler * * to generate the correct sequence of multiply-add fused instructions. * * * * These routines are not intended for 32-bit Intel architectures. * * * * A version of gcc higher than 932 is required. * * * * GCC compiler options: * * optimization level 3 (-O3) * * -fschedule-insns -finline-functions -funroll-all-loops * * * *******************************************************************************/ #ifdef __APPLE_CC__ #if __APPLE_CC__ > 930 #include "fp_private.h" #define NULL 0 /******************************************************************************* ******************************************************************************** * N A N * ******************************************************************************** * * * Return a NaN with the appropriate nan code. * * * * what does it do? it returns back a nan with the code in the lower half * * of the higher long word. * * if the string is empty, the code is zero; * * else if the string is a negative number, then the code is zero; * * else if the string is zero, then the code is zero; * * else if the string is larger than 255, then 255 is returned; * * else, the numerical content of the string is returned. * * * *******************************************************************************/ double nan ( const char *string ) { hexdouble QNaN; int zero = 0x30; // ASCII zero int n, next; QNaN.i.hi = 0x7ff80000; QNaN.i.lo = 0x00000000; if ( string == NULL ) return QNaN.d; n = *(string++); if ( n != 0 ) // if string is not null { n -= zero; // remove ASCII bias next = *string; if ( next > 0 ) // if string has more than 1 character { n *= 10; // make first digit tens digit n += *(string++) - zero; next = *string; if ( next > 0 ) // if string has more than 2 characters { n *= 10; // first two digits are hundreds and tens n += *string - zero; if ( n > 255 ) n = 255; } } } QNaN.i.hi |= n << 5; return QNaN.d; } float nanf ( const char *string ) { return ( ( float ) nan ( string ) ); } #else /* __APPLE_CC__ version */ #warning A higher version than gcc-932 is required. #endif /* __APPLE_CC__ version */ #endif /* __APPLE_CC__ */