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 #pragma weak __llround = llround 31 #if defined(__sparcv9) || defined(__amd64) 32 #pragma weak lround = llround 33 #pragma weak __lround = llround 34 #endif 35 36 /* 37 * llround(x) rounds its argument to the nearest integer, rounding 38 * ties away from zero, and converts the result to a 64 bit signed 39 * integer. 40 * 41 * If x is NaN, infinite, or so large that the nearest integer 42 * would exceed 64 bits, the invalid operation exception is raised. 43 */ 44 45 #include "libm.h" 46 47 long long 48 llround(double x) { 49 union { 50 unsigned i[2]; 51 double d; 52 } xx; 53 unsigned hx, sx, i; 54 55 xx.d = x; 56 hx = xx.i[HIWORD] & ~0x80000000; 57 sx = xx.i[HIWORD] & 0x80000000; 58 59 if (hx < 0x43300000) { /* |x| < 2^52 */ 60 /* handle |x| < 1 */ 61 if (hx < 0x3ff00000) { 62 if (hx >= 0x3fe00000) 63 return (sx ? -1LL : 1LL); 64 return (0LL); 65 } 66 67 /* round x at the integer bit */ 68 if (hx < 0x41300000) { 69 i = 1 << (0x412 - (hx >> 20)); 70 xx.i[HIWORD] = (xx.i[HIWORD] + i) & ~(i | (i - 1)); 71 xx.i[LOWORD] = 0; 72 } else { 73 i = 1 << (0x432 - (hx >> 20)); 74 xx.i[LOWORD] += i; 75 if (xx.i[LOWORD] < i) 76 xx.i[HIWORD]++; 77 xx.i[LOWORD] &= ~(i | (i - 1)); 78 } 79 } 80 81 /* now x is nan, inf, or integral */ 82 return ((long long) xx.d); 83 } 84