1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #if defined(ELFOBJ) 31 #pragma weak lrint = __lrint 32 #endif 33 34 /* 35 * lrint(x) rounds its argument to the nearest integer according 36 * to the current rounding direction and converts the result to 37 * a 32 bit signed integer. 38 * 39 * If x is NaN, infinite, or so large that the nearest integer 40 * would exceed 32 bits, the invalid operation exception is raised. 41 * If x is not an integer, the inexact exception is raised. 42 */ 43 44 #include <sys/isa_defs.h> /* _ILP32 */ 45 #include "libm.h" 46 47 #if defined(_ILP32) 48 long 49 lrint(double x) { 50 /* 51 * Note: The following code works on x86 (in the default rounding 52 * precision mode), but one should just use the fistpl instruction 53 * instead. 54 */ 55 union { 56 unsigned i[2]; 57 double d; 58 } xx, yy; 59 unsigned hx; 60 61 xx.d = x; 62 hx = xx.i[HIWORD] & ~0x80000000; 63 if (hx < 0x43300000) { /* |x| < 2^52 */ 64 /* add and subtract a power of two to round x to an integer */ 65 #if defined(__sparc) 66 yy.i[HIWORD] = (xx.i[HIWORD] & 0x80000000) | 0x43300000; 67 #elif defined(__x86) 68 yy.i[HIWORD] = (xx.i[HIWORD] & 0x80000000) | 0x43e00000; 69 #else 70 #error Unknown architecture 71 #endif 72 yy.i[LOWORD] = 0; 73 x = (x + yy.d) - yy.d; 74 } 75 76 /* now x is nan, inf, or integral */ 77 return ((long) x); 78 } 79 #else 80 #error Unsupported architecture 81 #endif /* defined(_ILP32) */ 82