ca58f1dbeb
2001-03-12 Ulrich Drepper <drepper@redhat.com> * sysdeps/ieee754/dbl-64/e_remainder.c: Fix handling of boundary conditions. * sysdeps/ieee754/dbl-64/e_pow.c: Fix handling of boundary conditions. * sysdeps/ieee754/dbl-64/s_sin.c (__sin): Handle Inf and NaN correctly. (__cos): Likewise. * sysdeps/ieee754/dbl-64/e_asin.c (__ieee754_asin): Handle NaN correctly. (__ieee754_acos): Likewise. redefinition. * sysdeps/ieee754/dbl-64/endian.h: Define also one of BIG_ENDI and LITTLE_ENDI. * sysdeps/ieee754/dbl-64/MathLib.h (Init_Lib): Use void as parameter list.
70 lines
2.8 KiB
C
70 lines
2.8 KiB
C
|
|
/*
|
|
* 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: mpatan2.c */
|
|
/* */
|
|
/* FUNCTIONS:mpatan2 */
|
|
/* */
|
|
/* FILES NEEDED: mpa.h */
|
|
/* mpa.c mpatan.c mpsqrt.c */
|
|
/* */
|
|
/* Multi-Precision Atan2(y,x) function subroutine, */
|
|
/* for precision p >= 4. */
|
|
/* y=0 is not permitted if x<=0. No error messages are given. */
|
|
/* The relative error of the result is bounded by 44.84*r**(1-p) */
|
|
/* if x <= 0, y != 0 and by 37.33*r**(1-p) if x>0. here r=2**24. */
|
|
/* */
|
|
/******************************************************************/
|
|
|
|
|
|
|
|
#include "mpa.h"
|
|
|
|
void __mpsqrt(mp_no *, mp_no *, int);
|
|
void __mpatan(mp_no *, mp_no *, int);
|
|
|
|
/* Multi-Precision Atan2(y,x) function subroutine, for p >= 4. */
|
|
/* y=0 is not permitted if x<=0. No error messages are given. */
|
|
void __mpatan2(mp_no *y, mp_no *x, mp_no *z, int p) {
|
|
|
|
static const double ZERO = 0.0, ONE = 1.0;
|
|
|
|
mp_no mpone = {0,{0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,
|
|
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,
|
|
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0}};
|
|
mp_no mpt1,mpt2,mpt3;
|
|
|
|
|
|
if (X[0] <= ZERO) {
|
|
mpone.e = 1; mpone.d[0] = mpone.d[1] = ONE;
|
|
__dvd(x,y,&mpt1,p); __mul(&mpt1,&mpt1,&mpt2,p);
|
|
if (mpt1.d[0] != ZERO) mpt1.d[0] = ONE;
|
|
__add(&mpt2,&mpone,&mpt3,p); __mpsqrt(&mpt3,&mpt2,p);
|
|
__add(&mpt1,&mpt2,&mpt3,p); mpt3.d[0]=Y[0];
|
|
__mpatan(&mpt3,&mpt1,p); __add(&mpt1,&mpt1,z,p);
|
|
}
|
|
else
|
|
{ __dvd(y,x,&mpt1,p);
|
|
__mpatan(&mpt1,z,p);
|
|
}
|
|
|
|
return;
|
|
}
|