25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER START
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * See the License for the specific language governing permissions
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * and limitations under the License.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis *
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * CDDL HEADER END
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * Use is subject to license terms.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
ddc0e0b53c661f6e439e3b7072b3ef353eadb4afRichard Lowe#pragma weak __rint = rint
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis/*
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * rint(x) return x rounded to integral according to the rounding direction
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis * rint(x) returns result with the same sign as x's, including 0.0.
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#include "libm.h"
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#if defined(__i386) && !defined(__amd64) && (!defined(__FLT_EVAL_METHOD__) || \
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis __FLT_EVAL_METHOD__ != 0)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisextern enum fp_precision_type __swapRP(enum fp_precision_type);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define DECLRP(x) enum fp_precision_type x;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define SWAPRP(new, x) x = __swapRP(new);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define RESTRP(x) (void) __swapRP(x);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#else
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define DECLRP(x)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define SWAPRP(new, x)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#define RESTRP(x)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis#endif
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisstatic const double
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis two52 = 4503599627370496.0,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis zero = 0.0,
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis one = 1.0;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisdouble
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtisrint(double x) {
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis DECLRP(rp)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis double t, w;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis int ix, hx;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis ix = ((int *)&x)[HIWORD];
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis hx = ix & ~0x80000000;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (hx >= 0x43300000)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (x * one);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis t = (ix < 0)? -two52 : two52;
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis SWAPRP(fp_double, rp) /* set precision mode to double */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis w = x + t; /* x+sign(x)*2**52 rounded */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis RESTRP(rp) /* restore precision mode */
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis if (w == t)
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return ((ix < 0)? -zero : zero);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis return (w - t);
25c28e83beb90e7c80452a7c818c5e6f73a07dc8Piotr Jasiukajtis}