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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* sf_cos.c -- float version of s_cos.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 one=1.0; |
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| 20 | #else |
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| 21 | static float one=1.0; |
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| 22 | #endif |
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| 23 | |||
| 24 | #ifdef __STDC__ |
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| 25 | float cosf(float x) |
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| 26 | #else |
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| 27 | float cosf(x) |
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| 28 | float x; |
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| 29 | #endif |
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| 30 | { |
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| 31 | float y[2],z=0.0; |
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| 32 | __int32_t n,ix; |
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| 33 | |||
| 34 | GET_FLOAT_WORD(ix,x); |
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| 35 | |||
| 36 | /* |x| ~< pi/4 */ |
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| 37 | ix &= 0x7fffffff; |
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| 38 | if(ix <= 0x3f490fd8) return __kernel_cosf(x,z); |
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| 39 | |||
| 40 | /* cos(Inf or NaN) is NaN */ |
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| 41 | else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; |
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| 42 | |||
| 43 | /* argument reduction needed */ |
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| 44 | else { |
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| 45 | n = __ieee754_rem_pio2f(x,y); |
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| 46 | switch(n&3) { |
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| 47 | case 0: return __kernel_cosf(y[0],y[1]); |
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| 48 | case 1: return -__kernel_sinf(y[0],y[1],1); |
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| 49 | case 2: return -__kernel_cosf(y[0],y[1]); |
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| 50 | default: |
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| 51 | return __kernel_sinf(y[0],y[1],1); |
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| 52 | } |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | #ifdef _DOUBLE_IS_32BITS |
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| 57 | |||
| 58 | #ifdef __STDC__ |
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| 59 | double cos(double x) |
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| 60 | #else |
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| 61 | double cos(x) |
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| 62 | double x; |
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| 63 | #endif |
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| 64 | { |
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| 65 | return (double) cosf((float) x); |
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| 66 | } |
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| 67 | |||
| 68 | #endif /* defined(_DOUBLE_IS_32BITS) */ |