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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_exp2.c] - Blame information for rev 855

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Line No. Rev Author Line
1 148 jeremybenn
 
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/* @(#)w_exp2.c 5.1 93/09/24 */
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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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/*
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FUNCTION
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        <<exp2>>, <<exp2f>>---exponential
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INDEX
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        exp2
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INDEX
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        exp2f
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ANSI_SYNOPSIS
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        #include <math.h>
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        double exp2(double <[x]>);
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        float exp2f(float <[x]>);
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TRAD_SYNOPSIS
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        #include <math.h>
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        double exp2(<[x]>);
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        double <[x]>;
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        float exp2f(<[x]>);
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        float <[x]>;
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DESCRIPTION
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        <<exp2>> and <<exp2f>> calculate 2 ^ <[x]>, that is,
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        @ifnottex
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        2 raised to the power <[x]>.
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        @end ifnottex
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        @tex
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        $2^x$
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        @end tex
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        You can use the (non-ANSI) function <<matherr>> to specify
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        error handling for these functions.
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RETURNS
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        On success, <<exp2>> and <<exp2f>> return the calculated value.
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        If the result underflows, the returned value is <<0>>.  If the
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        result overflows, the returned value is <<HUGE_VAL>>.  In
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        either case, <<errno>> is set to <<ERANGE>>.
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*/
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/*
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 * wrapper exp2(x)
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 */
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#include "fdlibm.h"
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#include <errno.h>
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#include <math.h>
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double exp2(double x)           /* wrapper exp2 */
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#else
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        double exp2(x)                  /* wrapper exp2 */
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        double x;
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#endif
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{
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  return pow(2.0, x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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