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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #if defined(ELFOBJ) 31 #pragma weak significand = __significand 32 #endif 33 34 #include "libm.h" 35 36 double 37 significand(double x) { 38 int ix = ((int *) &x)[HIWORD] & ~0x80000000; 39 40 /* weed out 0/+-Inf/NaN because C99 ilogb raises invalid on them */ 41 if ((ix | ((int *) &x)[LOWORD]) == 0 || ix >= 0x7ff00000) 42 #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN) 43 return ((ix & 0x80000) != 0 ? x : x + x); 44 /* assumes sparc-like QNaN */ 45 #else 46 return (x + x); 47 #endif 48 else 49 return (scalbn(x, -ilogb(x))); 50 } 51