Rev 4872 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* kf_sin.c -- float version of k_sin.c |
| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 3 | */ |
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| 4 | |||
| 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 | |||
| 16 | #include "fdlibm.h" |
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| 17 | |||
| 18 | #ifdef __STDC__ |
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| 19 | static const float |
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| 20 | #else |
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| 21 | static float |
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| 22 | #endif |
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| 23 | half = 5.0000000000e-01,/* 0x3f000000 */ |
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| 24 | S1 = -1.6666667163e-01, /* 0xbe2aaaab */ |
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| 25 | S2 = 8.3333337680e-03, /* 0x3c088889 */ |
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| 26 | S3 = -1.9841270114e-04, /* 0xb9500d01 */ |
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| 27 | S4 = 2.7557314297e-06, /* 0x3638ef1b */ |
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| 28 | S5 = -2.5050759689e-08, /* 0xb2d72f34 */ |
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| 29 | S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ |
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| 30 | |||
| 31 | #ifdef __STDC__ |
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| 32 | float __kernel_sinf(float x, float y, int iy) |
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| 33 | #else |
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| 34 | float __kernel_sinf(x, y, iy) |
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| 35 | float x,y; int iy; /* iy=0 if y is zero */ |
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| 36 | #endif |
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| 37 | { |
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| 38 | float z,r,v; |
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| 39 | __int32_t ix; |
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| 40 | GET_FLOAT_WORD(ix,x); |
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| 41 | ix &= 0x7fffffff; /* high word of x */ |
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| 42 | if(ix<0x32000000) /* |x| < 2**-27 */ |
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| 43 | {if((int)x==0) return x;} /* generate inexact */ |
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| 44 | z = x*x; |
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| 45 | v = z*x; |
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| 46 | r = S2+z*(S3+z*(S4+z*(S5+z*S6))); |
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| 47 | if(iy==0) return x+v*(S1+z*r); |
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| 48 | else return x-((z*(half*y-v*r)-y)-v*S1); |
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| 49 | } |