author | William Roberts <williamr@symbian.org> |
Fri, 23 Jul 2010 16:09:54 +0100 | |
branch | GCC_SURGE |
changeset 47 | d7383dba13ba |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* S_FREXP.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_frexp.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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<<frexp>>, <<frexpf>>---split floating-point number |
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INDEX |
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frexp |
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INDEX |
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frexpf |
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|
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ANSI_SYNOPSIS |
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#include <math.h> |
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double frexp(double <[val]>, int *<[exp]>); |
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float frexpf(float <[val]>, int *<[exp]>); |
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TRAD_SYNOPSIS |
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#include <math.h> |
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double frexp(<[val]>, <[exp]>) |
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double <[val]>; |
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int *<[exp]>; |
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|
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float frexpf(<[val]>, <[exp]>) |
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float <[val]>; |
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int *<[exp]>; |
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DESCRIPTION |
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All non zero, normal numbers can be described as <[m]> * 2**<[p]>. |
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<<frexp>> represents the double <[val]> as a mantissa <[m]> |
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and a power of two <[p]>. The resulting mantissa will always |
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be greater than or equal to <<0.5>>, and less than <<1.0>> (as |
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long as <[val]> is nonzero). The power of two will be stored |
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in <<*>><[exp]>. |
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|
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@ifinfo |
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<[m]> and <[p]> are calculated so that |
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<[val]> is <[m]> times <<2>> to the power <[p]>. |
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@end ifinfo |
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@tex |
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<[m]> and <[p]> are calculated so that |
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$ val = m \times 2^p $. |
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@end tex |
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<<frexpf>> is identical, other than taking and returning |
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floats rather than doubles. |
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RETURNS |
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<<frexp>> returns the mantissa <[m]>. If <[val]> is <<0>>, infinity, |
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or Nan, <<frexp>> will set <<*>><[exp]> to <<0>> and return <[val]>. |
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PORTABILITY |
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<<frexp>> is ANSI. |
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<<frexpf>> is an extension. |
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*/ |
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/* |
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* for non-zero x |
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* x = frexp(arg,&exp); |
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* return a double fp quantity x such that 0.5 <= |x| <1.0 |
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* and the corresponding binary exponent "exp". That is |
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* arg = x*2^exp. |
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* If arg is inf, 0.0, or NaN, then frexp(arg,&exp) returns arg |
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* with *exp=0. |
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*/ |
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#include "FDLIBM.H" |
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static const double |
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two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */ |
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/** |
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Get mantissa and exponent of floating-point value. |
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Calculates mantissa (a floating-point value between 0.5 and 1) |
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and exponent (an integer value) where x is parameter x, |
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mantissa is the value returned by the function and exponent |
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is set by the function at location pointed by eptr. |
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@return Mantissa. |
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@param x Floating point value |
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@param eptr Location where to exponent will be received. |
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*/ |
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EXPORT_C double frexp(double x, int *eptr) __SOFTFP |
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{ |
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__int32_t hx, ix, lx; |
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EXTRACT_WORDS(hx,lx,x); |
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ix = 0x7fffffff&hx; |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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105 |
*eptr = 0; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
106 |
if(ix>=0x7ff00000||((ix|lx)==0)) return x; /* 0,inf,nan */ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
107 |
if (ix<0x00100000) { /* subnormal */ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
108 |
x *= two54; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
109 |
GET_HIGH_WORD(hx,x); |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
110 |
ix = hx&0x7fffffff; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
111 |
*eptr = -54; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
112 |
} |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
113 |
*eptr += (ix>>20)-1022; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
114 |
hx = (hx&0x800fffff)|0x3fe00000; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
115 |
SET_HIGH_WORD(x,hx); |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
116 |
return x; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
117 |
} |