1 | /* sf_sin.c -- float version of s_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 | #include "fdlibm.h" |
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17 | |
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18 | #ifdef __STDC__ |
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19 | float sinf(float x) |
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20 | #else |
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21 | float sinf(x) |
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22 | float x; |
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23 | #endif |
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24 | { |
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25 | float y[2],z=0.0; |
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26 | __int32_t n,ix; |
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27 | |
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28 | GET_FLOAT_WORD(ix,x); |
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29 | |
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30 | /* |x| ~< pi/4 */ |
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31 | ix &= 0x7fffffff; |
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32 | if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); |
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33 | |
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34 | /* sin(Inf or NaN) is NaN */ |
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35 | else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; |
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36 | |
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37 | /* argument reduction needed */ |
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38 | else { |
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39 | n = __ieee754_rem_pio2f(x,y); |
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40 | switch(n&3) { |
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41 | case 0: return __kernel_sinf(y[0],y[1],1); |
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42 | case 1: return __kernel_cosf(y[0],y[1]); |
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43 | case 2: return -__kernel_sinf(y[0],y[1],1); |
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44 | default: |
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45 | return -__kernel_cosf(y[0],y[1]); |
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46 | } |
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47 | } |
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48 | } |
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49 | |
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50 | #ifdef _DOUBLE_IS_32BITS |
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51 | |
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52 | #ifdef __STDC__ |
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53 | double sin(double x) |
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54 | #else |
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55 | double sin(x) |
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56 | double x; |
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57 | #endif |
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58 | { |
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59 | return (double) sinf((float) x); |
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60 | } |
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61 | |
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62 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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