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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [sf_cos.c] - Rev 855
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/* 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) */
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