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 #pragma weak frexpf = __frexpf 31 32 #include "libm.h" 33 34 float 35 __frexpf(float x, int *exp) { 36 union { 37 unsigned i; 38 float f; 39 } xx; 40 unsigned hx; 41 int e; 42 43 xx.f = x; 44 hx = xx.i & ~0x80000000; 45 46 if (hx >= 0x7f800000) { /* x is infinite or NaN */ 47 *exp = 0; 48 return (x); 49 } 50 51 e = 0; 52 if (hx < 0x00800000) { /* x is subnormal or zero */ 53 if (hx == 0) { 54 *exp = 0; 55 return (x); 56 } 57 58 /* normalize x by regarding it as an integer */ 59 xx.f = (int) xx.i < 0 ? -(int) hx : (int) hx; 60 hx = xx.i & ~0x80000000; 61 e = -149; 62 } 63 64 /* now xx.f is normal */ 65 xx.i = (xx.i & ~0x7f800000) | 0x3f000000; 66 *exp = e + (hx >> 23) - 0x7e; 67 return (xx.f); 68 } 69