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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc2/] [newlib/] [libm/] [math/] [ef_cosh.c] - Rev 520
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/* ef_cosh.c -- float version of e_cosh.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 __v810__ #define const #endif #ifdef __STDC__ static const float one = 1.0, half=0.5, huge = 1.0e30; #else static float one = 1.0, half=0.5, huge = 1.0e30; #endif #ifdef __STDC__ float __ieee754_coshf(float x) #else float __ieee754_coshf(x) float x; #endif { float t,w; __int32_t ix; GET_FLOAT_WORD(ix,x); ix &= 0x7fffffff; /* x is INF or NaN */ if(!FLT_UWORD_IS_FINITE(ix)) return x*x; /* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */ if(ix<0x3eb17218) { t = expm1f(fabsf(x)); w = one+t; if (ix<0x24000000) return w; /* cosh(tiny) = 1 */ return one+(t*t)/(w+w); } /* |x| in [0.5*ln2,22], return (exp(|x|)+1/exp(|x|)/2; */ if (ix < 0x41b00000) { t = __ieee754_expf(fabsf(x)); return half*t+half/t; } /* |x| in [22, log(maxdouble)] return half*exp(|x|) */ if (ix <= FLT_UWORD_LOG_MAX) return half*__ieee754_expf(fabsf(x)); /* |x| in [log(maxdouble), overflowthresold] */ if (ix <= FLT_UWORD_LOG_2MAX) { w = __ieee754_expf(half*fabsf(x)); t = half*w; return t*w; } /* |x| > overflowthresold, cosh(x) overflow */ return huge*huge; }