5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* e_scalbf.c -- float version of e_scalb.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint)
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__RCSID("$NetBSD: e_scalbf.c,v 1.7 2010/04/23 19:17:07 drochner Exp $");
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#endif
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#include "namespace.h"
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#include "math.h"
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#include "math_private.h"
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#ifdef _SCALB_INT
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float
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__ieee754_scalbf(float x, int fn)
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#else
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float
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__ieee754_scalbf(float x, float fn)
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#endif
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{
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#ifdef _SCALB_INT
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return scalbnf(x,fn);
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#else
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if (isnanf(x)||isnanf(fn)) return x*fn;
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if (!finitef(fn)) {
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if(fn>(float)0.0) return x*fn;
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else return x/(-fn);
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}
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if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
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if ( fn > (float)65000.0) return scalbnf(x, 65000);
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if (-fn > (float)65000.0) return scalbnf(x,-65000);
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return scalbnf(x,(int)fn);
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#endif
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}
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