author | William Roberts <williamr@symbian.org> |
Thu, 22 Jul 2010 16:48:56 +0100 | |
branch | GCC_SURGE |
changeset 45 | 4b03adbd26ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/*-------------------------------------------------------------------- |
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*© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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*-------------------------------------------------------------------- |
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*/ |
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/* s_tanf.c -- float version of s_tan.c. |
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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*/ |
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|
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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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#ifndef __SYMBIAN32__ |
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#ifndef lint |
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static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_tanf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; |
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#endif |
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#endif //__SYMBIAN32__ |
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|
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#include <math.h> |
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#include "math_private.h" |
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|
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EXPORT_C |
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float |
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tanf(float x) |
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{ |
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float y[2],z=0.0; |
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int32_t n, ix; |
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GET_FLOAT_WORD(ix,x); |
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/* |x| ~< pi/4 */ |
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ix &= 0x7fffffff; |
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if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1); |
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/* tan(Inf or NaN) is NaN */ |
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else if (ix>=0x7f800000) return x-x; /* NaN */ |
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/* argument reduction needed */ |
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else { |
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n = __ieee754_rem_pio2f(x,y); |
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return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even |
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-1 -- n odd */ |
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} |
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} |