diff -r 000000000000 -r e4d67989cc36 genericopenlibs/cstdlib/LMATH/S_LDEXP.C --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/genericopenlibs/cstdlib/LMATH/S_LDEXP.C Tue Feb 02 02:01:42 2010 +0200 @@ -0,0 +1,86 @@ +/* S_LDEXP.C + * + * Portions Copyright (c) 1993-2005 Nokia Corporation and/or its subsidiary(-ies). + * All rights reserved. + */ + + +/* @(#)s_ldexp.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 + <>, <>---load exponent + +INDEX + ldexp +INDEX + ldexpf + +ANSI_SYNOPSIS + #include + double ldexp(double <[val]>, int <[exp]>); + float ldexpf(float <[val]>, int <[exp]>); + +TRAD_SYNOPSIS + #include + + double ldexp(<[val]>, <[exp]>) + double <[val]>; + int <[exp]>; + + float ldexpf(<[val]>, <[exp]>) + float <[val]>; + int <[exp]>; + + +DESCRIPTION +<> calculates the value +@ifinfo +<[val]> times 2 to the power <[exp]>. +@end ifinfo +@tex +$val\times 2^{exp}$. +@end tex +<> is identical, save that it takes and returns <> +rather than <> values. + +RETURNS +<> returns the calculated value. + +Underflow and overflow both set <> to <>. +On underflow, <> and <> return 0.0. +On overflow, <> returns plus or minus <>. + +PORTABILITY +<> is ANSI, <> is an extension. + +*/ + +#include "FDLIBM.H" +#include + +/** +Get floating-point value from mantissa and exponent. +Calculates the floating point value corresponding to +the given mantissa and exponent +@return Floating-point value equal to value * 2exp. +@param x Floating point value representing mantissa +@param exp Integer exponent +*/ +EXPORT_C double ldexp(double value, int exp) __SOFTFP +{ + if(!finite(value)||value==0.0) return value; + value = scalbn(value,exp); + if(!finite(value)||value==0.0) errno = ERANGE; + return value; +}