Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
4349 | Serge | 1 | /* sf_tan.c -- float version of s_tan.c. |
2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
||
3 | */ |
||
4 | |||
5 | /* |
||
6 | * ==================================================== |
||
7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
||
8 | * |
||
9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
||
10 | * Permission to use, copy, modify, and distribute this |
||
11 | * software is freely granted, provided that this notice |
||
12 | * is preserved. |
||
13 | * ==================================================== |
||
14 | */ |
||
15 | |||
16 | #include "fdlibm.h" |
||
17 | |||
18 | #ifdef __STDC__ |
||
19 | float tanf(float x) |
||
20 | #else |
||
21 | float tanf(x) |
||
22 | float x; |
||
23 | #endif |
||
24 | { |
||
25 | float y[2],z=0.0; |
||
26 | __int32_t n,ix; |
||
27 | |||
28 | GET_FLOAT_WORD(ix,x); |
||
29 | |||
30 | /* |x| ~< pi/4 */ |
||
31 | ix &= 0x7fffffff; |
||
32 | if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1); |
||
33 | |||
34 | /* tan(Inf or NaN) is NaN */ |
||
35 | else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; /* NaN */ |
||
36 | |||
37 | /* argument reduction needed */ |
||
38 | else { |
||
39 | n = __ieee754_rem_pio2f(x,y); |
||
40 | return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even |
||
41 | -1 -- n odd */ |
||
42 | } |
||
43 | } |
||
44 | |||
45 | #ifdef _DOUBLE_IS_32BITS |
||
46 | |||
47 | #ifdef __STDC__ |
||
48 | double tan(double x) |
||
49 | #else |
||
50 | double tan(x) |
||
51 | double x; |
||
52 | #endif |
||
53 | { |
||
54 | return (double) tanf((float) x); |
||
55 | } |
||
56 | |||
57 | #endif /* defined(_DOUBLE_IS_32BITS) */1));><1));>=>> |