59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* These math functions are taken from newlib-nano-2, the newlib/libm/math
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* directory, available from https://github.com/32bitmicro/newlib-nano-2.
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*
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* Appropriate copyright headers are reproduced below.
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*/
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/* 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-01f,/* 0x3f000000 */
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S1 = -1.6666667163e-01f, /* 0xbe2aaaab */
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S2 = 8.3333337680e-03f, /* 0x3c088889 */
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S3 = -1.9841270114e-04f, /* 0xb9500d01 */
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S4 = 2.7557314297e-06f, /* 0x3638ef1b */
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S5 = -2.5050759689e-08f, /* 0xb2d72f34 */
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S6 = 1.5896910177e-10f; /* 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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