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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [s_ldexp.c] - Rev 858
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/* @(#)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 <<ldexp>>, <<ldexpf>>---load exponent INDEX ldexp INDEX ldexpf ANSI_SYNOPSIS #include <math.h> double ldexp(double <[val]>, int <[exp]>); float ldexpf(float <[val]>, int <[exp]>); TRAD_SYNOPSIS #include <math.h> double ldexp(<[val]>, <[exp]>) double <[val]>; int <[exp]>; float ldexpf(<[val]>, <[exp]>) float <[val]>; int <[exp]>; DESCRIPTION <<ldexp>> calculates the value @ifnottex <[val]> times 2 to the power <[exp]>. @end ifnottex @tex $val\times 2^{exp}$. @end tex <<ldexpf>> is identical, save that it takes and returns <<float>> rather than <<double>> values. RETURNS <<ldexp>> returns the calculated value. Underflow and overflow both set <<errno>> to <<ERANGE>>. On underflow, <<ldexp>> and <<ldexpf>> return 0.0. On overflow, <<ldexp>> returns plus or minus <<HUGE_VAL>>. PORTABILITY <<ldexp>> is ANSI. <<ldexpf>> is an extension. */ #include "fdlibm.h" #include <errno.h> #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double ldexp(double value, int exp) #else double ldexp(value, exp) double value; int exp; #endif { if(!finite(value)||value==0.0) return value; value = scalbn(value,exp); if(!finite(value)||value==0.0) errno = ERANGE; return value; } #endif /* _DOUBLE_IS_32BITS */
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