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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1994-1997, by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "quad.h" 30 31 /* 32 * _Q_ulltoq(x) returns (long double)x. 33 */ 34 union longdouble 35 _Q_ulltoq(unsigned long long x) 36 { 37 union longdouble z; 38 unsigned int e; 39 40 /* test for zero */ 41 if (x == 0) { 42 Z.l.msw = Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 43 QUAD_RETURN(Z); 44 } 45 46 /* find the most significant bit */ 47 for (e = 63; (x & (1ll << e)) == 0; e--) 48 ; 49 50 if (e > 48) { 51 Z.l.msw = (x >> (e - 16)) & 0xffff; 52 Z.l.frac2 = x >> (e - 48); 53 Z.l.frac3 = x << (80 - e); 54 } else if (e > 16) { 55 Z.l.msw = (x >> (e - 16)) & 0xffff; 56 Z.l.frac2 = x << (48 - e); 57 Z.l.frac3 = 0; 58 } else { 59 Z.l.msw = (x << (16 - e)) & 0xffff; 60 Z.l.frac2 = Z.l.frac3 = 0; 61 } 62 Z.l.frac4 = 0; 63 Z.l.msw |= ((e + 0x3fff) << 16); 64 QUAD_RETURN(Z); 65 } 66