diff options
Diffstat (limited to 'lib/libm/sf_cos.c')
| -rw-r--r-- | lib/libm/sf_cos.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libm/sf_cos.c b/lib/libm/sf_cos.c new file mode 100644 index 0000000000..5776ef46bb --- /dev/null +++ b/lib/libm/sf_cos.c @@ -0,0 +1,77 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * These math functions are taken from newlib-nano-2, the newlib/libm/math + * directory, available from https://github.com/32bitmicro/newlib-nano-2. + * + * Appropriate copyright headers are reproduced below. + */ + +/* sf_cos.c -- float version of s_cos.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const float one=1.0; +#else +static float one=1.0; +#endif + +#ifdef __STDC__ + float cosf(float x) +#else + float cosf(x) + float x; +#endif +{ + float y[2],z=0.0; + __int32_t n,ix; + + GET_FLOAT_WORD(ix,x); + + /* |x| ~< pi/4 */ + ix &= 0x7fffffff; + if(ix <= 0x3f490fd8) return __kernel_cosf(x,z); + + /* cos(Inf or NaN) is NaN */ + else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; + + /* argument reduction needed */ + else { + n = __ieee754_rem_pio2f(x,y); + switch(n&3) { + case 0: return __kernel_cosf(y[0],y[1]); + case 1: return -__kernel_sinf(y[0],y[1],1); + case 2: return -__kernel_cosf(y[0],y[1]); + default: + return __kernel_sinf(y[0],y[1],1); + } + } +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double cos(double x) +#else + double cos(x) + double x; +#endif +{ + return (double) cosf((float) x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |