135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
#include <math.h>
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#include <errno.h>
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/* constants used by cephes functions */
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#define MAXNUML 1.189731495357231765021263853E4932L
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#define MAXLOGL 1.1356523406294143949492E4L
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#define MINLOGL -1.13994985314888605586758E4L
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#define LOGE2L 6.9314718055994530941723E-1L
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#define LOG2EL 1.4426950408889634073599E0L
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#define PIL 3.1415926535897932384626L
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#define PIO2L 1.5707963267948966192313L
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#define PIO4L 7.8539816339744830961566E-1L
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#define isfinitel isfinite
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#define isinfl isinf
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#define isnanl isnan
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#define signbitl signbit
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#define IBMPC 1
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#define ANSIPROT 1
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#define MINUSZERO 1
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#define INFINITIES 1
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#define NANS 1
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#define DENORMAL 1
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#define NEGZEROL (-0.0L)
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extern long double __INFL;
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#define INFINITYL (__INFL)
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extern long double __QNANL;
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#define NANL (__QNANL)
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#define VOLATILE
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#define mtherr(fname, code)
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#define XPD 0,
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#ifdef _CEPHES_USE_ERRNO
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#define _SET_ERRNO(x) errno = (x)
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#else
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#define _SET_ERRNO(x)
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#endif
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/*
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Cephes Math Library Release 2.2: July, 1992
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Copyright 1984, 1987, 1988, 1992 by Stephen L. Moshier
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Direct inquiries to 30 Frost Street, Cambridge, MA 02140
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*/
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/* polevll.c
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* p1evll.c
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*
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* Evaluate polynomial
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*
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*
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*
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* SYNOPSIS:
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*
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* int N;
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* long double x, y, coef[N+1], polevl[];
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*
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* y = polevll( x, coef, N );
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*
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*
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*
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* DESCRIPTION:
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*
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* Evaluates polynomial of degree N:
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*
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* 2 N
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* y = C + C x + C x +...+ C x
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* 0 1 2 N
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*
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* Coefficients are stored in reverse order:
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*
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* coef[0] = C , ..., coef[N] = C .
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* N 0
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*
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* The function p1evll() assumes that coef[N] = 1.0 and is
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* omitted from the array. Its calling arguments are
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* otherwise the same as polevll().
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*
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*
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* SPEED:
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*
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* In the interest of speed, there are no checks for out
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* of bounds arithmetic. This routine is used by most of
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* the functions in the library. Depending on available
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* equipment features, the user may wish to rewrite the
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* program in microcode or assembly language.
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*
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*/
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/* Polynomial evaluator:
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* P[0] x^n + P[1] x^(n-1) + ... + P[n]
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*/
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static __inline__ long double polevll( x, p, n )
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long double x;
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const void *p;
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int n;
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{
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register long double y;
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register long double *P = (long double *)p;
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y = *P++;
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do
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{
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y = y * x + *P++;
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}
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while( --n );
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return(y);
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}
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/* Polynomial evaluator:
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* x^n + P[0] x^(n-1) + P[1] x^(n-2) + ... + P[n]
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*/
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static __inline__ long double p1evll( x, p, n )
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long double x;
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const void *p;
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int n;
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{
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register long double y;
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register long double *P = (long double *)p;
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n -= 1;
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y = x + *P++;
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do
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{
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y = y * x + *P++;
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}
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while( --n );
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return( y );
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}
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