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 #ifdef __sparcv9 30 31 /* 32 * _Qp_itoq(pz, x) sets *pz = (long double)x. 33 */ 34 void 35 _Qp_itoq(union longdouble *pz, int x) 36 37 #else 38 39 /* 40 * _Q_itoq(x) returns (long double)x. 41 */ 42 union longdouble 43 _Q_itoq(int x) 44 45 #endif /* __sparcv9 */ 46 47 { 48 #ifndef __sparcv9 49 union longdouble z; 50 #endif 51 unsigned int s, e; 52 53 /* extract the sign */ 54 s = 0; 55 if (x < 0) { 56 if ((unsigned) x == 0x80000000) { 57 /* largest negative int */ 58 Z.l.msw = 0xc01e0000; 59 Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 60 QUAD_RETURN(Z); 61 } 62 x = -x; 63 s = 0x80000000; 64 } else if (x == 0) { 65 Z.l.msw = Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 66 QUAD_RETURN(Z); 67 } 68 69 /* find the most significant bit */ 70 for (e = 30; (x & (1 << e)) == 0; e--) 71 ; 72 73 if (e > 16) { 74 Z.l.msw = ((unsigned) x >> (e - 16)) & 0xffff; 75 Z.l.frac2 = (unsigned) x << (48 - e); 76 } else { 77 Z.l.msw = ((unsigned) x << (16 - e)) & 0xffff; 78 Z.l.frac2 = 0; 79 } 80 Z.l.frac3 = Z.l.frac4 = 0; 81 Z.l.msw |= s | ((e + 0x3fff) << 16); 82 QUAD_RETURN(Z); 83 } 84