blob: f44ed5b64a0ff12c4fb9e1f272b4c8ba8189f03a [file] [log] [blame]
Rich Felkerb69f6952012-03-13 01:17:53 -04001/* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */
2/*
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 */
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
Szabolcs Nagyec411992013-12-12 03:42:11 +000016#define _GNU_SOURCE
nsz9560b6b2012-03-13 19:51:14 +010017#include <math.h>
Rich Felkerb69f6952012-03-13 01:17:53 -040018
19float scalbf(float x, float fn)
20{
21 if (isnan(x) || isnan(fn)) return x*fn;
22 if (!isfinite(fn)) {
nsz8d0a6f72012-03-13 20:24:23 +010023 if (fn > 0.0f)
Rich Felkerb69f6952012-03-13 01:17:53 -040024 return x*fn;
25 else
26 return x/(-fn);
27 }
28 if (rintf(fn) != fn) return (fn-fn)/(fn-fn);
nsz8d0a6f72012-03-13 20:24:23 +010029 if ( fn > 65000.0f) return scalbnf(x, 65000);
30 if (-fn > 65000.0f) return scalbnf(x,-65000);
Rich Felkerb69f6952012-03-13 01:17:53 -040031 return scalbnf(x,(int)fn);
32}