diff options
author | Eric Andersen <andersen@codepoet.org> | 2001-11-22 14:04:29 +0000 |
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committer | Eric Andersen <andersen@codepoet.org> | 2001-11-22 14:04:29 +0000 |
commit | 7ce331c01ce6eb7b3f5c715a38a24359da9c6ee2 (patch) | |
tree | 3a7e8476e868ae15f4da1b7ce26b2db6f434468c /libm/double/sinh.c | |
parent | c117dd5fb183afb1a4790a6f6110d88704be6bf8 (diff) |
Totally rework the math library, this time based on the MacOs X
math library (which is itself based on the math lib from FreeBSD).
-Erik
Diffstat (limited to 'libm/double/sinh.c')
-rw-r--r-- | libm/double/sinh.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/libm/double/sinh.c b/libm/double/sinh.c deleted file mode 100644 index 545bd6826..000000000 --- a/libm/double/sinh.c +++ /dev/null @@ -1,148 +0,0 @@ -/* sinh.c - * - * Hyperbolic sine - * - * - * - * SYNOPSIS: - * - * double x, y, sinh(); - * - * y = sinh( x ); - * - * - * - * DESCRIPTION: - * - * Returns hyperbolic sine of argument in the range MINLOG to - * MAXLOG. - * - * The range is partitioned into two segments. If |x| <= 1, a - * rational function of the form x + x**3 P(x)/Q(x) is employed. - * Otherwise the calculation is sinh(x) = ( exp(x) - exp(-x) )/2. - * - * - * - * ACCURACY: - * - * Relative error: - * arithmetic domain # trials peak rms - * DEC +- 88 50000 4.0e-17 7.7e-18 - * IEEE +-MAXLOG 30000 2.6e-16 5.7e-17 - * - */ - -/* -Cephes Math Library Release 2.8: June, 2000 -Copyright 1984, 1995, 2000 by Stephen L. Moshier -*/ - -#include <math.h> - -#ifdef UNK -static double P[] = { --7.89474443963537015605E-1, --1.63725857525983828727E2, --1.15614435765005216044E4, --3.51754964808151394800E5 -}; -static double Q[] = { -/* 1.00000000000000000000E0,*/ --2.77711081420602794433E2, - 3.61578279834431989373E4, --2.11052978884890840399E6 -}; -#endif - -#ifdef DEC -static unsigned short P[] = { -0140112,0015377,0042731,0163255, -0142043,0134721,0146177,0123761, -0143464,0122706,0034353,0006017, -0144653,0140536,0157665,0054045 -}; -static unsigned short Q[] = { -/*0040200,0000000,0000000,0000000,*/ -0142212,0155404,0133513,0022040, -0044015,0036723,0173271,0011053, -0145400,0150407,0023710,0001034 -}; -#endif - -#ifdef IBMPC -static unsigned short P[] = { -0x3cd6,0xe8bb,0x435f,0xbfe9, -0xf4fe,0x398f,0x773a,0xc064, -0x6182,0xc71d,0x94b8,0xc0c6, -0xab05,0xdbf6,0x782b,0xc115 -}; -static unsigned short Q[] = { -/*0x0000,0x0000,0x0000,0x3ff0,*/ -0x6484,0x96e9,0x5b60,0xc071, -0x2245,0x7ed7,0xa7ba,0x40e1, -0x0044,0xe4f9,0x1a20,0xc140 -}; -#endif - -#ifdef MIEEE -static unsigned short P[] = { -0xbfe9,0x435f,0xe8bb,0x3cd6, -0xc064,0x773a,0x398f,0xf4fe, -0xc0c6,0x94b8,0xc71d,0x6182, -0xc115,0x782b,0xdbf6,0xab05 -}; -static unsigned short Q[] = { -0xc071,0x5b60,0x96e9,0x6484, -0x40e1,0xa7ba,0x7ed7,0x2245, -0xc140,0x1a20,0xe4f9,0x0044 -}; -#endif - -#ifdef ANSIPROT -extern double fabs ( double ); -extern double exp ( double ); -extern double polevl ( double, void *, int ); -extern double p1evl ( double, void *, int ); -#else -double fabs(), exp(), polevl(), p1evl(); -#endif -extern double INFINITY, MINLOG, MAXLOG, LOGE2; - -double sinh(x) -double x; -{ -double a; - -#ifdef MINUSZERO -if( x == 0.0 ) - return(x); -#endif -a = fabs(x); -if( (x > (MAXLOG + LOGE2)) || (x > -(MINLOG-LOGE2) ) ) - { - mtherr( "sinh", DOMAIN ); - if( x > 0 ) - return( INFINITY ); - else - return( -INFINITY ); - } -if( a > 1.0 ) - { - if( a >= (MAXLOG - LOGE2) ) - { - a = exp(0.5*a); - a = (0.5 * a) * a; - if( x < 0 ) - a = -a; - return(a); - } - a = exp(a); - a = 0.5*a - (0.5/a); - if( x < 0 ) - a = -a; - return(a); - } - -a *= a; -return( x + x * a * (polevl(a,P,3)/p1evl(a,Q,3)) ); -} |