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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [kf_sin.c] - Blame information for rev 816

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Line No. Rev Author Line
1 148 jeremybenn
/* kf_sin.c -- float version of k_sin.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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 * 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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#include "fdlibm.h"
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#ifdef __STDC__
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static const float
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#else
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static float
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#endif
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half =  5.0000000000e-01,/* 0x3f000000 */
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S1  = -1.6666667163e-01, /* 0xbe2aaaab */
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S2  =  8.3333337680e-03, /* 0x3c088889 */
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S3  = -1.9841270114e-04, /* 0xb9500d01 */
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S4  =  2.7557314297e-06, /* 0x3638ef1b */
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S5  = -2.5050759689e-08, /* 0xb2d72f34 */
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S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
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#ifdef __STDC__
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        float __kernel_sinf(float x, float y, int iy)
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#else
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        float __kernel_sinf(x, y, iy)
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        float x,y; int iy;              /* iy=0 if y is zero */
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#endif
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{
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        float z,r,v;
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        __int32_t ix;
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        GET_FLOAT_WORD(ix,x);
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        ix &= 0x7fffffff;                       /* high word of x */
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        if(ix<0x32000000)                       /* |x| < 2**-27 */
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           {if((int)x==0) return x;}             /* generate inexact */
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        z       =  x*x;
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        v       =  z*x;
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        r       =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
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        if(iy==0) return x+v*(S1+z*r);
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        else      return x-((z*(half*y-v*r)-y)-v*S1);
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}

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