diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/doasin.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/doasin.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/doasin.c b/sysdeps/ieee754/dbl-64/doasin.c new file mode 100644 index 0000000000..4ea108b9d7 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/doasin.c @@ -0,0 +1,81 @@ + +/* + * IBM Accurate Mathematical Library + * Copyright (c) International Business Machines Corp., 2001 + * + * 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 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 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +/**********************************************************************/ +/* 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" + +/********************************************************************/ +/* 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 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 hx,tx,hy,ty,tp,tq,tc,tcc; + + +/* 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] */ +} + + + + + + |