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 frexpf = __frexpf 32 #endif 33 34 #include "libm.h" 35 36 float 37 __frexpf(float x, int *exp) { 38 union { 39 unsigned i; 40 float f; 41 } xx; 42 unsigned hx; 43 int e; 44 45 xx.f = x; 46 hx = xx.i & ~0x80000000; 47 48 if (hx >= 0x7f800000) { /* x is infinite or NaN */ 49 *exp = 0; 50 return (x); 51 } 52 53 e = 0; 54 if (hx < 0x00800000) { /* x is subnormal or zero */ 55 if (hx == 0) { 56 *exp = 0; 57 return (x); 58 } 59 60 /* normalize x by regarding it as an integer */ 61 xx.f = (int) xx.i < 0 ? -(int) hx : (int) hx; 62 hx = xx.i & ~0x80000000; 63 e = -149; 64 } 65 66 /* now xx.f is normal */ 67 xx.i = (xx.i & ~0x7f800000) | 0x3f000000; 68 *exp = e + (hx >> 23) - 0x7e; 69 return (xx.f); 70 } 71