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_CPYSGN.C |
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* |
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* Portions Copyright (c) 1993-1999 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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*/ |
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/* @(#)s_copysign.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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<<copysign>>, <<copysignf>>---sign of <[y]>, magnitude of <[x]> |
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INDEX |
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copysign |
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INDEX |
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copysignf |
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|
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ANSI_SYNOPSIS |
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#include <math.h> |
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double copysign (double <[x]>, double <[y]>); |
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float copysignf (float <[x]>, float <[y]>); |
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TRAD_SYNOPSIS |
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#include <math.h> |
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double copysign (<[x]>, <[y]>) |
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double <[x]>; |
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double <[y]>; |
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|
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float copysignf (<[x]>, <[y]>) |
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float <[x]>; |
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float <[y]>; |
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DESCRIPTION |
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<<copysign>> constructs a number with the magnitude (absolute value) |
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of its first argument, <[x]>, and the sign of its second argument, |
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<[y]>. |
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|
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<<copysignf>> does the same thing; the two functions differ only in |
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the type of their arguments and result. |
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RETURNS |
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<<copysign>> returns a <<double>> with the magnitude of |
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<[x]> and the sign of <[y]>. |
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<<copysignf>> returns a <<float>> with the magnitude of |
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<[x]> and the sign of <[y]>. |
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PORTABILITY |
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<<copysign>> is not required by either ANSI C or the System V Interface |
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Definition (Issue 2). |
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*/ |
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/* |
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* copysign(double x, double y) |
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* copysign(x,y) returns a value with the magnitude of x and |
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* with the sign bit of y. |
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*/ |
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#include "FDLIBM.H" |
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/** |
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Constructs a number with the magnitude (absolute value) |
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of its first argument, x, and the sign of its second argument y. |
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@return a value with the magnitude of x and with the sign bit of y. |
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@param x magnitude |
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@param y sign bit |
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*/ |
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EXPORT_C double copysign(double x, double y) __SOFTFP |
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{ |
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__uint32_t hx,hy; |
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GET_HIGH_WORD(hx,x); |
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GET_HIGH_WORD(hy,y); |
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SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); |
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return x; |
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} |