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 __lrint = lrint
3125c28e83SPiotr Jasiukajtis
3225c28e83SPiotr Jasiukajtis /*
3325c28e83SPiotr Jasiukajtis * lrint(x) rounds its argument to the nearest integer according
3425c28e83SPiotr Jasiukajtis * to the current rounding direction and converts the result to
3525c28e83SPiotr Jasiukajtis * a 32 bit signed integer.
3625c28e83SPiotr Jasiukajtis *
3725c28e83SPiotr Jasiukajtis * If x is NaN, infinite, or so large that the nearest integer
3825c28e83SPiotr Jasiukajtis * would exceed 32 bits, the invalid operation exception is raised.
3925c28e83SPiotr Jasiukajtis * If x is not an integer, the inexact exception is raised.
4025c28e83SPiotr Jasiukajtis */
4125c28e83SPiotr Jasiukajtis
4225c28e83SPiotr Jasiukajtis #include <sys/isa_defs.h> /* _ILP32 */
4325c28e83SPiotr Jasiukajtis #include "libm.h"
4425c28e83SPiotr Jasiukajtis
4525c28e83SPiotr Jasiukajtis #if defined(_ILP32)
4625c28e83SPiotr Jasiukajtis long
lrint(double x)4725c28e83SPiotr Jasiukajtis lrint(double x) {
4825c28e83SPiotr Jasiukajtis /*
4925c28e83SPiotr Jasiukajtis * Note: The following code works on x86 (in the default rounding
5025c28e83SPiotr Jasiukajtis * precision mode), but one should just use the fistpl instruction
5125c28e83SPiotr Jasiukajtis * instead.
5225c28e83SPiotr Jasiukajtis */
5325c28e83SPiotr Jasiukajtis union {
5425c28e83SPiotr Jasiukajtis unsigned i[2];
5525c28e83SPiotr Jasiukajtis double d;
5625c28e83SPiotr Jasiukajtis } xx, yy;
5725c28e83SPiotr Jasiukajtis unsigned hx;
5825c28e83SPiotr Jasiukajtis
5925c28e83SPiotr Jasiukajtis xx.d = x;
6025c28e83SPiotr Jasiukajtis hx = xx.i[HIWORD] & ~0x80000000;
6125c28e83SPiotr Jasiukajtis if (hx < 0x43300000) { /* |x| < 2^52 */
6225c28e83SPiotr Jasiukajtis /* add and subtract a power of two to round x to an integer */
6325c28e83SPiotr Jasiukajtis #if defined(__sparc)
6425c28e83SPiotr Jasiukajtis yy.i[HIWORD] = (xx.i[HIWORD] & 0x80000000) | 0x43300000;
6525c28e83SPiotr Jasiukajtis #elif defined(__x86)
6625c28e83SPiotr Jasiukajtis yy.i[HIWORD] = (xx.i[HIWORD] & 0x80000000) | 0x43e00000;
6725c28e83SPiotr Jasiukajtis #else
6825c28e83SPiotr Jasiukajtis #error Unknown architecture
6925c28e83SPiotr Jasiukajtis #endif
7025c28e83SPiotr Jasiukajtis yy.i[LOWORD] = 0;
7125c28e83SPiotr Jasiukajtis x = (x + yy.d) - yy.d;
7225c28e83SPiotr Jasiukajtis }
7325c28e83SPiotr Jasiukajtis
7425c28e83SPiotr Jasiukajtis /* now x is nan, inf, or integral */
7525c28e83SPiotr Jasiukajtis return ((long) x);
7625c28e83SPiotr Jasiukajtis }
7725c28e83SPiotr Jasiukajtis #else
7825c28e83SPiotr Jasiukajtis #error Unsupported architecture
7925c28e83SPiotr Jasiukajtis #endif /* defined(_ILP32) */
80