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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [ef_sinh.c] - Rev 158
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/* ef_sinh.c -- float version of e_sinh.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, shuge = 1.0e37; #else static float one = 1.0, shuge = 1.0e37; #endif #ifdef __STDC__ float __ieee754_sinhf(float x) #else float __ieee754_sinhf(x) float x; #endif { float t,w,h; __int32_t ix,jx; GET_FLOAT_WORD(jx,x); ix = jx&0x7fffffff; /* x is INF or NaN */ if(!FLT_UWORD_IS_FINITE(ix)) return x+x; h = 0.5; if (jx<0) h = -h; /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */ if (ix < 0x41b00000) { /* |x|<22 */ if (ix<0x31800000) /* |x|<2**-28 */ if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */ t = expm1f(fabsf(x)); if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one)); return h*(t+t/(t+one)); } /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */ if (ix<=FLT_UWORD_LOG_MAX) return h*__ieee754_expf(fabsf(x)); /* |x| in [log(maxdouble), overflowthresold] */ if (ix<=FLT_UWORD_LOG_2MAX) { w = __ieee754_expf((float)0.5*fabsf(x)); t = h*w; return t*w; } /* |x| > overflowthresold, sinh(x) overflow */ return x*shuge; }
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