/* * IBM Accurate Mathematical Library * Copyright (C) 2001-2022 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, see <https://www.gnu.org/licenses/>. */ /***********************************************************************/ /*MODULE_NAME: dla.h */ /* */ /* This file holds C language macros for 'Double Length Floating Point */ /* Arithmetic'. The macros are based on the paper: */ /* T.J.Dekker, "A floating-point Technique for extending the */ /* Available Precision", Number. Math. 18, 224-242 (1971). */ /* A Double-Length number is defined by a pair (r,s), of IEEE double */ /* precision floating point numbers that satisfy, */ /* */ /* abs(s) <= abs(r+s)*2**(-53)/(1+2**(-53)). */ /* */ /* The computer arithmetic assumed is IEEE double precision in */ /* round to nearest mode. All variables in the macros must be of type */ /* IEEE double. */ /***********************************************************************/ /* CN = 1+2**27 = '41a0000002000000' IEEE double format. Use it to split a double for better accuracy. */ #define CN …
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