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 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