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Diffstat (limited to 'newlib/libm/math/w_exp2.c')
-rw-r--r-- | newlib/libm/math/w_exp2.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/newlib/libm/math/w_exp2.c b/newlib/libm/math/w_exp2.c new file mode 100644 index 000000000..5a0c6edb8 --- /dev/null +++ b/newlib/libm/math/w_exp2.c @@ -0,0 +1,71 @@ + +/* @(#)w_exp2.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* +FUNCTION + <<exp2>>, <<exp2f>>---exponential +INDEX + exp2 +INDEX + exp2f + +ANSI_SYNOPSIS + #include <math.h> + double exp2(double <[x]>); + float exp2f(float <[x]>); + +TRAD_SYNOPSIS + #include <math.h> + double exp2(<[x]>); + double <[x]>; + + float exp2f(<[x]>); + float <[x]>; + +DESCRIPTION + <<exp2>> and <<exp2f>> calculate 2 ^ <[x]>, that is, + @ifinfo + 2 raised to the power <[x]>. + + You can use the (non-ANSI) function <<matherr>> to specify + error handling for these functions. + +RETURNS + On success, <<exp2>> and <<exp2f>> return the calculated value. + If the result underflows, the returned value is <<0>>. If the + result overflows, the returned value is <<HUGE_VAL>>. In + either case, <<errno>> is set to <<ERANGE>>. + +*/ + +/* + * wrapper exp2(x) + */ + +#include "fdlibm.h" +#include <errno.h> +#include <math.h> + +#ifndef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double exp2(double x) /* wrapper exp2 */ +#else + double exp2(x) /* wrapper exp2 */ + double x; +#endif +{ + return pow(2.0, x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |