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 #include "quad.h" 28 29 /* 30 * _Qp_xtoq(pz, x) sets *pz = (long double)x. 31 */ 32 void 33 _Qp_xtoq(union longdouble *pz, long x) 34 { 35 unsigned int s, e; 36 37 /* extract the sign */ 38 s = 0; 39 if (x < 0) { 40 if ((unsigned long) x == 0x8000000000000000ul) { 41 /* largest negative 64 bit int */ 42 Z.l.msw = 0xc03e0000; 43 Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 44 QUAD_RETURN(Z); 45 } 46 x = -x; 47 s = 0x80000000; 48 } else if (x == 0) { 49 Z.l.msw = Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 50 QUAD_RETURN(Z); 51 } 52 53 /* find the most significant bit */ 54 for (e = 62; (x & (1l << e)) == 0; e--) 55 ; 56 57 if (e > 48) { 58 Z.l.msw = ((unsigned long) x >> (e - 16)) & 0xffff; 59 Z.l.frac2 = (unsigned long) x >> (e - 48); 60 Z.l.frac3 = (unsigned long) x << (80 - e); 61 } else if (e > 16) { 62 Z.l.msw = ((unsigned long) x >> (e - 16)) & 0xffff; 63 Z.l.frac2 = (unsigned long) x << (48 - e); 64 Z.l.frac3 = 0; 65 } else { 66 Z.l.msw = ((unsigned long) x << (16 - e)) & 0xffff; 67 Z.l.frac2 = Z.l.frac3 = 0; 68 } 69 Z.l.frac4 = 0; 70 Z.l.msw |= s | ((e + 0x3fff) << 16); 71 QUAD_RETURN(Z); 72 } 73