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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak scalbf = __scalbf 30 31 #include "libm.h" 32 33 float 34 scalbf(float x, float y) { 35 int ix, iy, hx, hy, n; 36 37 ix = *(int *)&x; 38 iy = *(int *)&y; 39 hx = ix & ~0x80000000; 40 hy = iy & ~0x80000000; 41 42 if (hx > 0x7f800000 || hy >= 0x7f800000) { 43 /* x is nan or y is inf or nan */ 44 return ((iy < 0)? x / -y : x * y); 45 } 46 47 /* see if y is an integer without raising inexact */ 48 if (hy >= 0x4b000000) { 49 /* |y| >= 2^23, so it must be an integer */ 50 n = (iy < 0)? -65000 : 65000; 51 } else if (hy < 0x3f800000) { 52 /* |y| < 1, so it must be zero or non-integer */ 53 return ((hy == 0)? x : (x - x) / (x - x)); 54 } else { 55 if (hy & ((1 << (0x96 - (hy >> 23))) - 1)) 56 return ((y - y) / (y - y)); 57 n = (int)y; 58 } 59 return (scalbnf(x, n)); 60 } 61