mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/*
|
|
* IBM Accurate Mathematical Library
|
|
* written by International Business Machines Corp.
|
|
* Copyright (C) 2001-2014 Free Software Foundation, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/**********************************************************************/
|
|
/* MODULE_NAME: doasin.c */
|
|
/* */
|
|
/* FUNCTION: doasin */
|
|
/* */
|
|
/* FILES NEEDED:endian.h mydefs.h dla.h doasin.h */
|
|
/* mpa.c */
|
|
/* */
|
|
/* Compute arcsin(x,dx,v) of double-length number (x+dx) the result */
|
|
/* stored in v where v= v[0]+v[1] =arcsin(x+dx) */
|
|
/**********************************************************************/
|
|
|
|
#include "endian.h"
|
|
#include "mydefs.h"
|
|
#include <dla.h>
|
|
#include <math_private.h>
|
|
|
|
#ifndef SECTION
|
|
# define SECTION
|
|
#endif
|
|
|
|
/********************************************************************/
|
|
/* Compute arcsin(x,dx,v) of double-length number (x+dx) the result */
|
|
/* stored in v where v= v[0]+v[1] =arcsin(x+dx) */
|
|
/********************************************************************/
|
|
void
|
|
SECTION
|
|
__doasin(double x, double dx, double v[]) {
|
|
|
|
#include "doasin.h"
|
|
|
|
static const double
|
|
d5 = 0.22372159090911789889975459505194491E-01,
|
|
d6 = 0.17352764422456822913014975683014622E-01,
|
|
d7 = 0.13964843843786693521653681033981614E-01,
|
|
d8 = 0.11551791438485242609036067259086589E-01,
|
|
d9 = 0.97622386568166960207425666787248914E-02,
|
|
d10 = 0.83638737193775788576092749009744976E-02,
|
|
d11 = 0.79470250400727425881446981833568758E-02;
|
|
|
|
double xx,p,pp,u,uu,r,s;
|
|
double tc,tcc;
|
|
#ifndef DLA_FMS
|
|
double hx,tx,hy,ty,tp,tq;
|
|
#endif
|
|
|
|
|
|
/* Taylor series for arcsin for Double-Length numbers */
|
|
xx = x*x+2.0*x*dx;
|
|
p = ((((((d11*xx+d10)*xx+d9)*xx+d8)*xx+d7)*xx+d6)*xx+d5)*xx;
|
|
pp = 0;
|
|
|
|
MUL2(x,dx,x,dx,u,uu,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
ADD2(p,pp,c4.x,cc4.x,p,pp,r,s);
|
|
MUL2(p,pp,u,uu,p,pp,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
ADD2(p,pp,c3.x,cc3.x,p,pp,r,s);
|
|
MUL2(p,pp,u,uu,p,pp,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
ADD2(p,pp,c2.x,cc2.x,p,pp,r,s);
|
|
MUL2(p,pp,u,uu,p,pp,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
ADD2(p,pp,c1.x,cc1.x,p,pp,r,s);
|
|
MUL2(p,pp,u,uu,p,pp,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
MUL2(p,pp,x,dx,p,pp,tp,hx,tx,hy,ty,tq,tc,tcc);
|
|
ADD2(p,pp,x,dx,p,pp,r,s);
|
|
v[0]=p;
|
|
v[1]=pp; /* arcsin(x+dx)=v[0]+v[1] */
|
|
}
|