1*25c28e83SPiotr Jasiukajtis /* 2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START 3*25c28e83SPiotr Jasiukajtis * 4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*25c28e83SPiotr Jasiukajtis * 8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*25c28e83SPiotr Jasiukajtis * and limitations under the License. 12*25c28e83SPiotr Jasiukajtis * 13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*25c28e83SPiotr Jasiukajtis * 19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END 20*25c28e83SPiotr Jasiukajtis */ 21*25c28e83SPiotr Jasiukajtis 22*25c28e83SPiotr Jasiukajtis /* 23*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24*25c28e83SPiotr Jasiukajtis */ 25*25c28e83SPiotr Jasiukajtis /* 26*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27*25c28e83SPiotr Jasiukajtis * Use is subject to license terms. 28*25c28e83SPiotr Jasiukajtis */ 29*25c28e83SPiotr Jasiukajtis 30*25c28e83SPiotr Jasiukajtis #pragma weak frexpf = __frexpf 31*25c28e83SPiotr Jasiukajtis 32*25c28e83SPiotr Jasiukajtis #include "libm.h" 33*25c28e83SPiotr Jasiukajtis 34*25c28e83SPiotr Jasiukajtis float __frexpf(float x,int * exp)35*25c28e83SPiotr Jasiukajtis__frexpf(float x, int *exp) { 36*25c28e83SPiotr Jasiukajtis union { 37*25c28e83SPiotr Jasiukajtis unsigned i; 38*25c28e83SPiotr Jasiukajtis float f; 39*25c28e83SPiotr Jasiukajtis } xx; 40*25c28e83SPiotr Jasiukajtis unsigned hx; 41*25c28e83SPiotr Jasiukajtis int e; 42*25c28e83SPiotr Jasiukajtis 43*25c28e83SPiotr Jasiukajtis xx.f = x; 44*25c28e83SPiotr Jasiukajtis hx = xx.i & ~0x80000000; 45*25c28e83SPiotr Jasiukajtis 46*25c28e83SPiotr Jasiukajtis if (hx >= 0x7f800000) { /* x is infinite or NaN */ 47*25c28e83SPiotr Jasiukajtis *exp = 0; 48*25c28e83SPiotr Jasiukajtis return (x); 49*25c28e83SPiotr Jasiukajtis } 50*25c28e83SPiotr Jasiukajtis 51*25c28e83SPiotr Jasiukajtis e = 0; 52*25c28e83SPiotr Jasiukajtis if (hx < 0x00800000) { /* x is subnormal or zero */ 53*25c28e83SPiotr Jasiukajtis if (hx == 0) { 54*25c28e83SPiotr Jasiukajtis *exp = 0; 55*25c28e83SPiotr Jasiukajtis return (x); 56*25c28e83SPiotr Jasiukajtis } 57*25c28e83SPiotr Jasiukajtis 58*25c28e83SPiotr Jasiukajtis /* normalize x by regarding it as an integer */ 59*25c28e83SPiotr Jasiukajtis xx.f = (int) xx.i < 0 ? -(int) hx : (int) hx; 60*25c28e83SPiotr Jasiukajtis hx = xx.i & ~0x80000000; 61*25c28e83SPiotr Jasiukajtis e = -149; 62*25c28e83SPiotr Jasiukajtis } 63*25c28e83SPiotr Jasiukajtis 64*25c28e83SPiotr Jasiukajtis /* now xx.f is normal */ 65*25c28e83SPiotr Jasiukajtis xx.i = (xx.i & ~0x7f800000) | 0x3f000000; 66*25c28e83SPiotr Jasiukajtis *exp = e + (hx >> 23) - 0x7e; 67*25c28e83SPiotr Jasiukajtis return (xx.f); 68*25c28e83SPiotr Jasiukajtis } 69