Last change
on this file since 466 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Line | |
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1 | /* sf_tan.c -- float version of s_tan.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 tanf(float x) |
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20 | #else |
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21 | float tanf(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 <= 0x3f490fda) return __kernel_tanf(x,z,1); |
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33 | |
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34 | /* tan(Inf or NaN) is NaN */ |
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35 | else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; /* NaN */ |
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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 | return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even |
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41 | -1 -- n odd */ |
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42 | } |
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43 | } |
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44 | |
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45 | #ifdef _DOUBLE_IS_32BITS |
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46 | |
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47 | #ifdef __STDC__ |
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48 | double tan(double x) |
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49 | #else |
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50 | double tan(x) |
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51 | double x; |
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52 | #endif |
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53 | { |
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54 | return (double) tanf((float) x); |
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55 | } |
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56 | |
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57 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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