2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
13 * __ieee754_scalb(x, fn) is provided for
14 * passing various standard test suites.
15 * One should use scalbn() instead.
19 #include "math_private.h"
22 double __ieee754_scalb(double x
, double fn
)
24 if (isnan(x
)||isnan(fn
)) return x
*fn
;
26 if(fn
>0.0) return x
*fn
;
29 if (rint(fn
)!=fn
) return (fn
-fn
)/(fn
-fn
);
30 if ( fn
> 65000.0) return scalbn(x
, 65000);
31 if (-fn
> 65000.0) return scalbn(x
,-65000);
32 return scalbn(x
,(int)fn
);
35 #if defined __UCLIBC_SUSV3_LEGACY__
37 * wrapper scalb(double x, double fn) is provided for
38 * passing various standard test suites.
39 * One should use scalbn() instead.
42 double scalb(double x
, double fn
)
44 double z
= __ieee754_scalb(x
, fn
);
45 if (_LIB_VERSION
== _IEEE_
)
47 if (!(isfinite(z
) || isnan(z
)) && isfinite(x
))
48 return __kernel_standard(x
, (double)fn
, 32); /* scalb overflow */
49 if (z
== 0.0 && z
!= x
)
50 return __kernel_standard(x
, (double)fn
, 33); /* scalb underflow */
56 strong_alias(__ieee754_scalb
, scalb
)
58 libm_hidden_def(scalb
)
60 #endif /* UCLIBC_SUSV3_LEGACY */