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extensions.h
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extensions.h
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#ifndef __extensions_h__
#define __extensions_h__ 1
#include <math.h>
#if MATH_EXTENSION
inline double hypot(double x, double y)
{
return sqrt(x*x+y*y);
}
inline double log2(double x)
{
static const double Log2=log(2);
return log(x)/Log2;
}
inline double pow2(double x)
{
return pow(2,x);
}
inline void sincos(const double x, double *sinx, double *cosx)
{
*sinx=sin(x); *cosx=cos(x);
}
#endif
inline double sgn(const double x)
{
return (x == 0.0 ? 0.0 : (x > 0.0 ? 1.0 : -1.0));
}
#ifdef HAVE_LONGEXP
inline long double exp(long double x)
{
return expl(x);
}
inline long double expratio1(long double x)
{
return (x != 0.0) ? expm1l(x)/x : 1.0;
}
inline long double expratio1l(long double x)
{
if(fabsl(x) > 1.0) return (expl(x)-1.0)/x;
x *= 0.0625;
register long double x2=x*x;
register long double x3=x2*x;
register long double x4=x2*x2;
register long double x8=x4*x4;
register long double
sum=1+x*Coeff[1]+x2*Coeff[2]+x3*Coeff[3]+x4*Coeff[4]+x4*x*Coeff[5]
+x4*x2*Coeff[6]+x4*x3*Coeff[7]+x8*Coeff[8]+x8*x*Coeff[9];
register long double y=sum+1.0;
register long double y2=y*y;
register long double y4=y2*y2;
return sum*(y+1.0)*(y2+1.0)*(y4+1.0)*(y4*y4+1.0);
}
#endif
#endif