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 #ifdef __sparcv9 32 33 /* 34 * _Qp_itoq(pz, x) sets *pz = (long double)x. 35 */ 36 void 37 _Qp_itoq(union longdouble *pz, int x) 38 39 #else 40 41 /* 42 * _Q_itoq(x) returns (long double)x. 43 */ 44 union longdouble 45 _Q_itoq(int x) 46 47 #endif /* __sparcv9 */ 48 49 { 50 #ifndef __sparcv9 51 union longdouble z; 52 #endif 53 unsigned int s, e; 54 55 /* extract the sign */ 56 s = 0; 57 if (x < 0) { 58 if ((unsigned) x == 0x80000000) { 59 /* largest negative int */ 60 Z.l.msw = 0xc01e0000; 61 Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 62 QUAD_RETURN(Z); 63 } 64 x = -x; 65 s = 0x80000000; 66 } else if (x == 0) { 67 Z.l.msw = Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0; 68 QUAD_RETURN(Z); 69 } 70 71 /* find the most significant bit */ 72 for (e = 30; (x & (1 << e)) == 0; e--) 73 ; 74 75 if (e > 16) { 76 Z.l.msw = ((unsigned) x >> (e - 16)) & 0xffff; 77 Z.l.frac2 = (unsigned) x << (48 - e); 78 } else { 79 Z.l.msw = ((unsigned) x << (16 - e)) & 0xffff; 80 Z.l.frac2 = 0; 81 } 82 Z.l.frac3 = Z.l.frac4 = 0; 83 Z.l.msw |= s | ((e + 0x3fff) << 16); 84 QUAD_RETURN(Z); 85 } 86