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_dtoq(pz, x) sets *pz = (long double)x. 35 */ 36 void 37 _Qp_dtoq(union longdouble *pz, double x) 38 39 #else 40 41 /* 42 * _Q_dtoq(x) returns (long double)x. 43 */ 44 union longdouble 45 _Q_dtoq(double x) 46 47 #endif /* __sparcv9 */ 48 49 { 50 #ifndef __sparcv9 51 union longdouble z; 52 #endif 53 union xdouble u; 54 unsigned int m, lhi, llo, fsr; 55 56 /* extract the exponent */ 57 u.d = x; 58 m = ((u.l.hi & 0x7ff00000) >> 4) + 0x3c000000; 59 if (m == 0x3c000000) { 60 /* x is zero or denormal */ 61 if ((u.l.hi & 0xfffff) | u.l.lo) { 62 /* x is denormal, normalize it */ 63 m = 0x3c010000; 64 lhi = u.l.hi & 0xfffff; 65 llo = u.l.lo; 66 do { 67 lhi = (lhi << 1) | (llo >> 31); 68 llo <<= 1; 69 m -= 0x10000; 70 } while ((lhi & 0x7ff00000) == 0); 71 u.l.hi = (u.l.hi & 0x80000000) | lhi; 72 u.l.lo = llo; 73 } else { 74 m = 0; 75 } 76 } else if (m == 0x43ff0000) { 77 /* x is inf or nan */ 78 m = 0x7fff0000; 79 if (((u.l.hi & 0x7ffff) | u.l.lo) && (u.l.hi & 0x80000) == 0) { 80 /* snan, signal invalid */ 81 __quad_getfsrp(&fsr); 82 if (fsr & FSR_NVM) { 83 __quad_fdtoq(&x, &Z); 84 QUAD_RETURN(Z); 85 } else { 86 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC; 87 __quad_setfsrp(&fsr); 88 } 89 u.l.hi |= 0x80000; 90 } 91 } 92 Z.l.msw = m | (u.l.hi & 0x80000000) | ((u.l.hi & 0xffff0) >> 4); 93 Z.l.frac2 = (u.l.hi << 28) | (u.l.lo >> 4); 94 Z.l.frac3 = u.l.lo << 28; 95 Z.l.frac4 = 0; 96 QUAD_RETURN(Z); 97 } 98