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 llround = __llround 32 #if defined(__sparcv9) || defined(__amd64) 33 #pragma weak lround = __llround 34 #pragma weak __lround = __llround 35 #endif 36 #endif 37 38 /* 39 * llround(x) rounds its argument to the nearest integer, rounding 40 * ties away from zero, and converts the result to a 64 bit signed 41 * integer. 42 * 43 * If x is NaN, infinite, or so large that the nearest integer 44 * would exceed 64 bits, the invalid operation exception is raised. 45 */ 46 47 #include "libm.h" 48 49 long long 50 llround(double x) { 51 union { 52 unsigned i[2]; 53 double d; 54 } xx; 55 unsigned hx, sx, i; 56 57 xx.d = x; 58 hx = xx.i[HIWORD] & ~0x80000000; 59 sx = xx.i[HIWORD] & 0x80000000; 60 61 if (hx < 0x43300000) { /* |x| < 2^52 */ 62 /* handle |x| < 1 */ 63 if (hx < 0x3ff00000) { 64 if (hx >= 0x3fe00000) 65 return (sx ? -1LL : 1LL); 66 return (0LL); 67 } 68 69 /* round x at the integer bit */ 70 if (hx < 0x41300000) { 71 i = 1 << (0x412 - (hx >> 20)); 72 xx.i[HIWORD] = (xx.i[HIWORD] + i) & ~(i | (i - 1)); 73 xx.i[LOWORD] = 0; 74 } else { 75 i = 1 << (0x432 - (hx >> 20)); 76 xx.i[LOWORD] += i; 77 if (xx.i[LOWORD] < i) 78 xx.i[HIWORD]++; 79 xx.i[LOWORD] &= ~(i | (i - 1)); 80 } 81 } 82 83 /* now x is nan, inf, or integral */ 84 return ((long long) xx.d); 85 } 86