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/* Test file for mpfr_sqrt.
Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The MPFR Library 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#ifdef IRIX64
#include <sys/fpu.h>
#endif
extern int isnan(), getpid();
#define check(a,r) check3(a,r,-1.0)
int maxulp=0;
void check3(a, rnd_mode, Q) double a; unsigned char rnd_mode; double Q;
{
mpfr_t q; double Q2; int ck,u;
ck = (Q!=-1.0); /* if ck=1, then Q is certified correct */
mpfr_init2(q, 53);
mpfr_set_d(q, a, rnd_mode);
mpfr_set_machine_rnd_mode(rnd_mode);
mpfr_sqrt(q, q, rnd_mode);
if (ck==0) Q = sqrt(a);
Q2 = mpfr_get_d(q);
if (Q!=Q2 && (!isnan(Q) || !isnan(Q2))) {
u = ulp(Q2,Q);
if (ck) {
printf("mpfr_sqrt failed for a=%1.20e, rnd_mode=%d\n",a,rnd_mode);
printf("expected sqrt is %1.20e, got %1.20e (%d ulp)\n",Q,Q2,u);
exit(1);
}
else if (u>maxulp || u<-maxulp) {
maxulp = (u>maxulp) ? u : -u;
printf("libm.a differs from mpfr_sqrt for a=%1.20e, rnd_mode=%d\n",a,rnd_mode);
printf("libm.a gives %1.20e, mpfr_sqrt gives %1.20e (%d ulp)\n",Q,Q2,u);
}
}
mpfr_clear(q);
}
int main()
{
int i; double a;
#ifdef IRIX64
/* to get denormalized numbers on IRIX64 */
union fpc_csr exp;
exp.fc_word = get_fpc_csr();
exp.fc_struct.flush = 0;
set_fpc_csr(exp.fc_word);
#endif
srand(getpid());
check(6.37983013646045901440e+32, GMP_RNDN);
check(1.0, GMP_RNDN);
check(1.0, GMP_RNDZ);
check(3.725290298461914062500000e-9, GMP_RNDN);
check(3.725290298461914062500000e-9, GMP_RNDZ);
a=1190456976439861.0;
check3(a, GMP_RNDZ, dbl(4630914205854029.0,-27));
check3(1024.0*a, GMP_RNDZ, dbl(4630914205854029.0,-22));
check(9.89438396044940256501e-134, GMP_RNDU);
for (i=0;i<100000;i++) {
a = drand();
check(a, rand() % 4);
}
return 0;
}
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