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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [sf_tan.c] - Rev 301
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/* sf_tan.c -- float version of s_tan.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__ float tanf(float x) #else float tanf(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 <= 0x3f490fda) return __kernel_tanf(x,z,1); /* tan(Inf or NaN) is NaN */ else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; /* NaN */ /* argument reduction needed */ else { n = __ieee754_rem_pio2f(x,y); return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even -1 -- n odd */ } } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double tan(double x) #else double tan(x) double x; #endif { return (double) tanf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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