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_stoq(pz, x) sets *pz = (long double)x. 35 */ 36 void 37 _Qp_stoq(union longdouble *pz, float x) 38 39 #else 40 41 /* 42 * _Qp_stoq(x) returns (long double)x. 43 */ 44 union longdouble 45 _Q_stoq(float x) 46 47 #endif /* __sparcv9 */ 48 49 { 50 #ifndef __sparcv9 51 union longdouble z; 52 #endif 53 union { 54 float f; 55 unsigned int l; 56 } u; 57 unsigned int m, f, fsr; 58 59 /* extract the exponent */ 60 u.f = x; 61 m = ((u.l & 0x7f800000) >> 7) + 0x3f800000; 62 if (m == 0x3f800000) { 63 /* x is zero or denormal */ 64 if (u.l & 0x7fffff) { 65 /* x is denormal, normalize it */ 66 m = 0x3f810000; 67 f = u.l & 0x7fffff; 68 do { 69 f <<= 1; 70 m -= 0x10000; 71 } while ((f & 0x7f800000) == 0); 72 u.l = (u.l & 0x80000000) | f; 73 } else { 74 m = 0; 75 } 76 } else if (m == 0x407f0000) { 77 /* x is inf or nan */ 78 m = 0x7fff0000; 79 if ((u.l & 0x3fffff) && (u.l & 0x400000) == 0) { 80 /* snan, signal invalid */ 81 __quad_getfsrp(&fsr); 82 if (fsr & FSR_NVM) { 83 __quad_fstoq(&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 |= 0x400000; 90 } 91 } 92 Z.l.msw = m | (u.l & 0x80000000) | ((u.l & 0x7fff80) >> 7); 93 Z.l.frac2 = u.l << 25; 94 Z.l.frac3 = Z.l.frac4 = 0; 95 QUAD_RETURN(Z); 96 } 97