1 /**************************************************************** 2 3 The author of this software is David M. Gay. 4 5 Copyright (C) 1998, 1999 by Lucent Technologies 6 All Rights Reserved 7 8 Permission to use, copy, modify, and distribute this software and 9 its documentation for any purpose and without fee is hereby 10 granted, provided that the above copyright notice appear in all 11 copies and that both that the copyright notice and this 12 permission notice and warranty disclaimer appear in supporting 13 documentation, and that the name of Lucent or any of its entities 14 not be used in advertising or publicity pertaining to 15 distribution of the software without specific, written prior 16 permission. 17 18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25 THIS SOFTWARE. 26 27 ****************************************************************/ 28 29 /* Please send bug reports to 30 David M. Gay 31 Bell Laboratories, Room 2C-463 32 600 Mountain Avenue 33 Murray Hill, NJ 07974-0636 34 U.S.A. 35 dmg@bell-labs.com 36 */ 37 38 #include "gdtoaimp.h" 39 40 double 41 ulp 42 #ifdef KR_headers 43 (x) double x; 44 #else 45 (double x) 46 #endif 47 { 48 Long L; 49 double a; 50 51 L = (word0(x) & Exp_mask) - (P-1)*Exp_msk1; 52 #ifndef Sudden_Underflow 53 if (L > 0) { 54 #endif 55 #ifdef IBM 56 L |= Exp_msk1 >> 4; 57 #endif 58 word0(a) = L; 59 word1(a) = 0; 60 #ifndef Sudden_Underflow 61 } 62 else { 63 L = -L >> Exp_shift; 64 if (L < Exp_shift) { 65 word0(a) = 0x80000 >> L; 66 word1(a) = 0; 67 } 68 else { 69 word0(a) = 0; 70 L -= Exp_shift; 71 word1(a) = L >= 31 ? 1 : 1 << 31 - L; 72 } 73 } 74 #endif 75 return a; 76 } 77