author | William Roberts <williamr@symbian.org> |
Fri, 23 Jul 2010 11:57:06 +0100 | |
branch | GCC_SURGE |
changeset 46 | 0a3770c1cffe |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* S_LDEXP.C |
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* |
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* Portions Copyright (c) 1993-2005 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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*/ |
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/* @(#)s_ldexp.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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<<ldexp>>, <<ldexpf>>---load exponent |
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INDEX |
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ldexp |
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INDEX |
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ldexpf |
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ANSI_SYNOPSIS |
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#include <math.h> |
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double ldexp(double <[val]>, int <[exp]>); |
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float ldexpf(float <[val]>, int <[exp]>); |
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TRAD_SYNOPSIS |
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#include <math.h> |
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double ldexp(<[val]>, <[exp]>) |
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double <[val]>; |
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int <[exp]>; |
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float ldexpf(<[val]>, <[exp]>) |
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float <[val]>; |
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int <[exp]>; |
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DESCRIPTION |
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<<ldexp>> calculates the value |
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@ifinfo |
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<[val]> times 2 to the power <[exp]>. |
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@end ifinfo |
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@tex |
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$val\times 2^{exp}$. |
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@end tex |
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<<ldexpf>> is identical, save that it takes and returns <<float>> |
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rather than <<double>> values. |
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RETURNS |
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<<ldexp>> returns the calculated value. |
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Underflow and overflow both set <<errno>> to <<ERANGE>>. |
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On underflow, <<ldexp>> and <<ldexpf>> return 0.0. |
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On overflow, <<ldexp>> returns plus or minus <<HUGE_VAL>>. |
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PORTABILITY |
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<<ldexp>> is ANSI, <<ldexpf>> is an extension. |
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*/ |
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#include "FDLIBM.H" |
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#include <errno.h> |
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/** |
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Get floating-point value from mantissa and exponent. |
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Calculates the floating point value corresponding to |
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the given mantissa and exponent |
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@return Floating-point value equal to value * 2exp. |
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@param x Floating point value representing mantissa |
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@param exp Integer exponent |
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*/ |
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EXPORT_C double ldexp(double value, int exp) __SOFTFP |
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{ |
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if(!finite(value)||value==0.0) return value; |
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value = scalbn(value,exp); |
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if(!finite(value)||value==0.0) errno = ERANGE; |
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return value; |
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} |