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Diffstat (limited to 'libm/ldouble/exp2l.c')
-rw-r--r-- | libm/ldouble/exp2l.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/libm/ldouble/exp2l.c b/libm/ldouble/exp2l.c deleted file mode 100644 index 076f8bca5..000000000 --- a/libm/ldouble/exp2l.c +++ /dev/null @@ -1,166 +0,0 @@ -/* exp2l.c - * - * Base 2 exponential function, long double precision - * - * - * - * SYNOPSIS: - * - * long double x, y, exp2l(); - * - * y = exp2l( x ); - * - * - * - * DESCRIPTION: - * - * Returns 2 raised to the x power. - * - * Range reduction is accomplished by separating the argument - * into an integer k and fraction f such that - * x k f - * 2 = 2 2. - * - * A Pade' form - * - * 1 + 2x P(x**2) / (Q(x**2) - x P(x**2) ) - * - * approximates 2**x in the basic range [-0.5, 0.5]. - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * IEEE +-16300 300000 9.1e-20 2.6e-20 - * - * - * See exp.c for comments on error amplification. - * - * - * ERROR MESSAGES: - * - * message condition value returned - * exp2l underflow x < -16382 0.0 - * exp2l overflow x >= 16384 MAXNUM - * - */ - - -/* -Cephes Math Library Release 2.7: May, 1998 -Copyright 1984, 1991, 1998 by Stephen L. Moshier -*/ - - - -#include <math.h> - -#ifdef UNK -static long double P[] = { - 6.0614853552242266094567E1L, - 3.0286971917562792508623E4L, - 2.0803843631901852422887E6L, -}; -static long double Q[] = { -/* 1.0000000000000000000000E0,*/ - 1.7492876999891839021063E3L, - 3.2772515434906797273099E5L, - 6.0027204078348487957118E6L, -}; -#endif - - -#ifdef IBMPC -static short P[] = { -0xffd8,0x6ad6,0x9c2b,0xf275,0x4004, XPD -0x3426,0x2dc5,0xf19f,0xec9d,0x400d, XPD -0x7ec0,0xd041,0x02e7,0xfdf4,0x4013, XPD -}; -static short Q[] = { -/*0x0000,0x0000,0x0000,0x8000,0x3fff,*/ -0x575b,0x9b93,0x34d6,0xdaa9,0x4009, XPD -0xe38d,0x6d74,0xa4f0,0xa005,0x4011, XPD -0xb37e,0xcfba,0x40d0,0xb730,0x4015, XPD -}; -#endif - -#ifdef MIEEE -static long P[] = { -0x40040000,0xf2759c2b,0x6ad6ffd8, -0x400d0000,0xec9df19f,0x2dc53426, -0x40130000,0xfdf402e7,0xd0417ec0, -}; -static long Q[] = { -/*0x3fff0000,0x80000000,0x00000000,*/ -0x40090000,0xdaa934d6,0x9b93575b, -0x40110000,0xa005a4f0,0x6d74e38d, -0x40150000,0xb73040d0,0xcfbab37e, -}; -#endif - -#define MAXL2L 16384.0L -#define MINL2L -16382.0L - - -extern long double MAXNUML; -#ifdef ANSIPROT -extern long double polevll ( long double, void *, int ); -extern long double p1evll ( long double, void *, int ); -extern long double floorl ( long double ); -extern long double ldexpl ( long double, int ); -extern int isnanl ( long double ); -#else -long double polevll(), p1evll(), floorl(), ldexpl(), isnanl(); -#endif -#ifdef INFINITIES -extern long double INFINITYL; -#endif - -long double exp2l(x) -long double x; -{ -long double px, xx; -int n; - -#ifdef NANS -if( isnanl(x) ) - return(x); -#endif -if( x > MAXL2L) - { -#ifdef INFINITIES - return( INFINITYL ); -#else - mtherr( "exp2l", OVERFLOW ); - return( MAXNUML ); -#endif - } - -if( x < MINL2L ) - { -#ifndef INFINITIES - mtherr( "exp2l", UNDERFLOW ); -#endif - return(0.0L); - } - -xx = x; /* save x */ -/* separate into integer and fractional parts */ -px = floorl(x+0.5L); -n = px; -x = x - px; - -/* rational approximation - * exp2(x) = 1.0 + 2xP(xx)/(Q(xx) - P(xx)) - * where xx = x**2 - */ -xx = x * x; -px = x * polevll( xx, P, 2 ); -x = px / ( p1evll( xx, Q, 3 ) - px ); -x = 1.0L + ldexpl( x, 1 ); - -/* scale by power of 2 */ -x = ldexpl( x, n ); -return(x); -} |