1*25c28e83SPiotr Jasiukajtis /* 2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START 3*25c28e83SPiotr Jasiukajtis * 4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*25c28e83SPiotr Jasiukajtis * 8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*25c28e83SPiotr Jasiukajtis * and limitations under the License. 12*25c28e83SPiotr Jasiukajtis * 13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*25c28e83SPiotr Jasiukajtis * 19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END 20*25c28e83SPiotr Jasiukajtis */ 21*25c28e83SPiotr Jasiukajtis /* 22*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*25c28e83SPiotr Jasiukajtis */ 24*25c28e83SPiotr Jasiukajtis /* 25*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 27*25c28e83SPiotr Jasiukajtis */ 28*25c28e83SPiotr Jasiukajtis 29*25c28e83SPiotr Jasiukajtis #pragma weak rint = __rint 30*25c28e83SPiotr Jasiukajtis 31*25c28e83SPiotr Jasiukajtis /* 32*25c28e83SPiotr Jasiukajtis * rint(x) return x rounded to integral according to the rounding direction 33*25c28e83SPiotr Jasiukajtis * rint(x) returns result with the same sign as x's, including 0.0. 34*25c28e83SPiotr Jasiukajtis */ 35*25c28e83SPiotr Jasiukajtis 36*25c28e83SPiotr Jasiukajtis #include "libm.h" 37*25c28e83SPiotr Jasiukajtis 38*25c28e83SPiotr Jasiukajtis #if defined(__i386) && !defined(__amd64) && (!defined(__FLT_EVAL_METHOD__) || \ 39*25c28e83SPiotr Jasiukajtis __FLT_EVAL_METHOD__ != 0) 40*25c28e83SPiotr Jasiukajtis extern enum fp_precision_type __swapRP(enum fp_precision_type); 41*25c28e83SPiotr Jasiukajtis #define DECLRP(x) enum fp_precision_type x; 42*25c28e83SPiotr Jasiukajtis #define SWAPRP(new, x) x = __swapRP(new); 43*25c28e83SPiotr Jasiukajtis #define RESTRP(x) (void) __swapRP(x); 44*25c28e83SPiotr Jasiukajtis #else 45*25c28e83SPiotr Jasiukajtis #define DECLRP(x) 46*25c28e83SPiotr Jasiukajtis #define SWAPRP(new, x) 47*25c28e83SPiotr Jasiukajtis #define RESTRP(x) 48*25c28e83SPiotr Jasiukajtis #endif 49*25c28e83SPiotr Jasiukajtis 50*25c28e83SPiotr Jasiukajtis static const double 51*25c28e83SPiotr Jasiukajtis two52 = 4503599627370496.0, 52*25c28e83SPiotr Jasiukajtis zero = 0.0, 53*25c28e83SPiotr Jasiukajtis one = 1.0; 54*25c28e83SPiotr Jasiukajtis 55*25c28e83SPiotr Jasiukajtis double 56*25c28e83SPiotr Jasiukajtis rint(double x) { 57*25c28e83SPiotr Jasiukajtis DECLRP(rp) 58*25c28e83SPiotr Jasiukajtis double t, w; 59*25c28e83SPiotr Jasiukajtis int ix, hx; 60*25c28e83SPiotr Jasiukajtis 61*25c28e83SPiotr Jasiukajtis ix = ((int *)&x)[HIWORD]; 62*25c28e83SPiotr Jasiukajtis hx = ix & ~0x80000000; 63*25c28e83SPiotr Jasiukajtis 64*25c28e83SPiotr Jasiukajtis if (hx >= 0x43300000) 65*25c28e83SPiotr Jasiukajtis return (x * one); 66*25c28e83SPiotr Jasiukajtis t = (ix < 0)? -two52 : two52; 67*25c28e83SPiotr Jasiukajtis SWAPRP(fp_double, rp) /* set precision mode to double */ 68*25c28e83SPiotr Jasiukajtis w = x + t; /* x+sign(x)*2**52 rounded */ 69*25c28e83SPiotr Jasiukajtis RESTRP(rp) /* restore precision mode */ 70*25c28e83SPiotr Jasiukajtis if (w == t) 71*25c28e83SPiotr Jasiukajtis return ((ix < 0)? -zero : zero); 72*25c28e83SPiotr Jasiukajtis return (w - t); 73*25c28e83SPiotr Jasiukajtis } 74