| 1 | /* k_sinf.c -- float version of k_sin.c
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| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * ====================================================
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| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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| 8 | *
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| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business.
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| 10 | * Permission to use, copy, modify, and distribute this
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| 11 | * software is freely granted, provided that this notice
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| 12 | * is preserved.
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| 13 | * ====================================================
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| 14 | */
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| 15 |
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| 16 | #ifndef lint
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| 17 | static char rcsid[] = "$FreeBSD: src/lib/msun/src/k_sinf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
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| 18 | #endif
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| 19 |
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| 20 | #include "math.h"
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| 21 | #include "math_private.h"
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| 22 |
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| 23 | static const float
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| 24 | half = 5.0000000000e-01,/* 0x3f000000 */
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| 25 | S1 = -1.6666667163e-01, /* 0xbe2aaaab */
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| 26 | S2 = 8.3333337680e-03, /* 0x3c088889 */
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| 27 | S3 = -1.9841270114e-04, /* 0xb9500d01 */
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| 28 | S4 = 2.7557314297e-06, /* 0x3638ef1b */
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| 29 | S5 = -2.5050759689e-08, /* 0xb2d72f34 */
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| 30 | S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */
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| 31 |
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| 32 | float
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| 33 | __kernel_sinf(float x, float y, int iy)
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| 34 | {
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| 35 | float z,r,v;
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| 36 | int32_t ix;
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| 37 | GET_FLOAT_WORD(ix,x);
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| 38 | ix &= 0x7fffffff; /* high word of x */
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| 39 | if(ix<0x32000000) /* |x| < 2**-27 */
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| 40 | {if((int)x==0) return x;} /* generate inexact */
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| 41 | z = x*x;
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| 42 | v = z*x;
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| 43 | r = S2+z*(S3+z*(S4+z*(S5+z*S6)));
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| 44 | if(iy==0) return x+v*(S1+z*r);
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| 45 | else return x-((z*(half*y-v*r)-y)-v*S1);
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| 46 | }
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