125c28e83SPiotr Jasiukajtis /* 225c28e83SPiotr Jasiukajtis * CDDL HEADER START 325c28e83SPiotr Jasiukajtis * 425c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 525c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 625c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 725c28e83SPiotr Jasiukajtis * 825c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 925c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 1025c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 1125c28e83SPiotr Jasiukajtis * and limitations under the License. 1225c28e83SPiotr Jasiukajtis * 1325c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 1425c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 1525c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 1625c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 1725c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 1825c28e83SPiotr Jasiukajtis * 1925c28e83SPiotr Jasiukajtis * CDDL HEADER END 2025c28e83SPiotr Jasiukajtis */ 2125c28e83SPiotr Jasiukajtis 2225c28e83SPiotr Jasiukajtis /* 2325c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 2425c28e83SPiotr Jasiukajtis */ 2525c28e83SPiotr Jasiukajtis /* 2625c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 2725c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2825c28e83SPiotr Jasiukajtis */ 2925c28e83SPiotr Jasiukajtis 30*ddc0e0b5SRichard Lowe #pragma weak __remainderl = remainderl 3125c28e83SPiotr Jasiukajtis 3225c28e83SPiotr Jasiukajtis #include "libm.h" 3325c28e83SPiotr Jasiukajtis #include "longdouble.h" 3425c28e83SPiotr Jasiukajtis 3525c28e83SPiotr Jasiukajtis /* 3625c28e83SPiotr Jasiukajtis * remainderl(x,p) 3725c28e83SPiotr Jasiukajtis * returns x REM p = x - [x/p]*p as if in infinite 3825c28e83SPiotr Jasiukajtis * precise arithmetic, where [x/p] is the (inifinite bit) 3925c28e83SPiotr Jasiukajtis * integer nearest x/p (in half way case choose the even one). 4025c28e83SPiotr Jasiukajtis * Method : 4125c28e83SPiotr Jasiukajtis * Based on fmodl() return x-[x/p]chopped*p exactly. 4225c28e83SPiotr Jasiukajtis */ 4325c28e83SPiotr Jasiukajtis 4425c28e83SPiotr Jasiukajtis #define HFMAX 5.948657476786158825428796633140035080982e+4931L 4525c28e83SPiotr Jasiukajtis #define DBMIN 6.724206286224187012525355634643505205196e-4932L 4625c28e83SPiotr Jasiukajtis 4725c28e83SPiotr Jasiukajtis static const long double 4825c28e83SPiotr Jasiukajtis zero = 0.0L, 4925c28e83SPiotr Jasiukajtis half = 0.5L, 5025c28e83SPiotr Jasiukajtis hfmax = HFMAX, /* half of the maximum number */ 5125c28e83SPiotr Jasiukajtis dbmin = DBMIN; /* double of the minimum (normal) number */ 5225c28e83SPiotr Jasiukajtis 5325c28e83SPiotr Jasiukajtis long double 5425c28e83SPiotr Jasiukajtis remainderl(long double x, long double p) { 5525c28e83SPiotr Jasiukajtis long double hp; 5625c28e83SPiotr Jasiukajtis int sx; 5725c28e83SPiotr Jasiukajtis 5825c28e83SPiotr Jasiukajtis if (isnanl(p)) 5925c28e83SPiotr Jasiukajtis return (x + p); 6025c28e83SPiotr Jasiukajtis if (!finitel(x)) 6125c28e83SPiotr Jasiukajtis return (x - x); 6225c28e83SPiotr Jasiukajtis p = fabsl(p); 6325c28e83SPiotr Jasiukajtis if (p <= hfmax) 6425c28e83SPiotr Jasiukajtis x = fmodl(x, p + p); 6525c28e83SPiotr Jasiukajtis sx = signbitl(x); 6625c28e83SPiotr Jasiukajtis x = fabsl(x); 6725c28e83SPiotr Jasiukajtis if (p < dbmin) { 6825c28e83SPiotr Jasiukajtis if (x + x > p) { 6925c28e83SPiotr Jasiukajtis if (x == p) 7025c28e83SPiotr Jasiukajtis x = zero; 7125c28e83SPiotr Jasiukajtis else 7225c28e83SPiotr Jasiukajtis x -= p; /* avoid x-x=-0 in RM mode */ 7325c28e83SPiotr Jasiukajtis if (x + x >= p) 7425c28e83SPiotr Jasiukajtis x -= p; 7525c28e83SPiotr Jasiukajtis } 7625c28e83SPiotr Jasiukajtis } else { 7725c28e83SPiotr Jasiukajtis hp = half * p; 7825c28e83SPiotr Jasiukajtis if (x > hp) { 7925c28e83SPiotr Jasiukajtis if (x == p) 8025c28e83SPiotr Jasiukajtis x = zero; 8125c28e83SPiotr Jasiukajtis else 8225c28e83SPiotr Jasiukajtis x -= p; /* avoid x-x=-0 in RM mode */ 8325c28e83SPiotr Jasiukajtis if (x >= hp) 8425c28e83SPiotr Jasiukajtis x -= p; 8525c28e83SPiotr Jasiukajtis } 8625c28e83SPiotr Jasiukajtis } 8725c28e83SPiotr Jasiukajtis return (sx == 0 ? x : -x); 8825c28e83SPiotr Jasiukajtis } 89