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 __llround = llround
3125c28e83SPiotr Jasiukajtis #if defined(__sparcv9) || defined(__amd64)
32*ddc0e0b5SRichard Lowe #pragma weak lround = llround
33*ddc0e0b5SRichard Lowe #pragma weak __lround = llround
3425c28e83SPiotr Jasiukajtis #endif
3525c28e83SPiotr Jasiukajtis
3625c28e83SPiotr Jasiukajtis /*
3725c28e83SPiotr Jasiukajtis * llround(x) rounds its argument to the nearest integer, rounding
3825c28e83SPiotr Jasiukajtis * ties away from zero, and converts the result to a 64 bit signed
3925c28e83SPiotr Jasiukajtis * integer.
4025c28e83SPiotr Jasiukajtis *
4125c28e83SPiotr Jasiukajtis * If x is NaN, infinite, or so large that the nearest integer
4225c28e83SPiotr Jasiukajtis * would exceed 64 bits, the invalid operation exception is raised.
4325c28e83SPiotr Jasiukajtis */
4425c28e83SPiotr Jasiukajtis
4525c28e83SPiotr Jasiukajtis #include "libm.h"
4625c28e83SPiotr Jasiukajtis
4725c28e83SPiotr Jasiukajtis long long
llround(double x)4825c28e83SPiotr Jasiukajtis llround(double x) {
4925c28e83SPiotr Jasiukajtis union {
5025c28e83SPiotr Jasiukajtis unsigned i[2];
5125c28e83SPiotr Jasiukajtis double d;
5225c28e83SPiotr Jasiukajtis } xx;
5325c28e83SPiotr Jasiukajtis unsigned hx, sx, i;
5425c28e83SPiotr Jasiukajtis
5525c28e83SPiotr Jasiukajtis xx.d = x;
5625c28e83SPiotr Jasiukajtis hx = xx.i[HIWORD] & ~0x80000000;
5725c28e83SPiotr Jasiukajtis sx = xx.i[HIWORD] & 0x80000000;
5825c28e83SPiotr Jasiukajtis
5925c28e83SPiotr Jasiukajtis if (hx < 0x43300000) { /* |x| < 2^52 */
6025c28e83SPiotr Jasiukajtis /* handle |x| < 1 */
6125c28e83SPiotr Jasiukajtis if (hx < 0x3ff00000) {
6225c28e83SPiotr Jasiukajtis if (hx >= 0x3fe00000)
6325c28e83SPiotr Jasiukajtis return (sx ? -1LL : 1LL);
6425c28e83SPiotr Jasiukajtis return (0LL);
6525c28e83SPiotr Jasiukajtis }
6625c28e83SPiotr Jasiukajtis
6725c28e83SPiotr Jasiukajtis /* round x at the integer bit */
6825c28e83SPiotr Jasiukajtis if (hx < 0x41300000) {
6925c28e83SPiotr Jasiukajtis i = 1 << (0x412 - (hx >> 20));
7025c28e83SPiotr Jasiukajtis xx.i[HIWORD] = (xx.i[HIWORD] + i) & ~(i | (i - 1));
7125c28e83SPiotr Jasiukajtis xx.i[LOWORD] = 0;
7225c28e83SPiotr Jasiukajtis } else {
7325c28e83SPiotr Jasiukajtis i = 1 << (0x432 - (hx >> 20));
7425c28e83SPiotr Jasiukajtis xx.i[LOWORD] += i;
7525c28e83SPiotr Jasiukajtis if (xx.i[LOWORD] < i)
7625c28e83SPiotr Jasiukajtis xx.i[HIWORD]++;
7725c28e83SPiotr Jasiukajtis xx.i[LOWORD] &= ~(i | (i - 1));
7825c28e83SPiotr Jasiukajtis }
7925c28e83SPiotr Jasiukajtis }
8025c28e83SPiotr Jasiukajtis
8125c28e83SPiotr Jasiukajtis /* now x is nan, inf, or integral */
8225c28e83SPiotr Jasiukajtis return ((long long) xx.d);
8325c28e83SPiotr Jasiukajtis }
84