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
scalbf(float x,float y)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