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/* Test file for mpfr_ui_sub.
Copyright (C) 2000 Free Software Foundation.
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 "mpfr.h"
#include "mpfr-impl.h"
#ifdef __mips
#include <sys/fpu.h>
#endif
extern int isnan();
extern int getpid();
#define ABS(x) (((x)>0) ? (x) : (-x))
/* checks that y/x gives the same results in double
and with mpfr with 53 bits of precision */
void check(unsigned long y, double x, unsigned int rnd_mode, double z1)
{
double z2; mpfr_t xx, zz;
mpfr_init2(xx, 53);
mpfr_init2(zz, 53);
mpfr_set_d(xx, x, rnd_mode);
mpfr_ui_sub(zz, y, xx, rnd_mode);
#ifdef TEST
mpfr_set_machine_rnd_mode(rnd_mode);
#endif
if (z1==0.0) z1 = y-x;
z2 = mpfr_get_d(zz);
if (z1!=z2 && !(isnan(z1) && isnan(z2))) {
printf("expected difference is %1.20e, got %1.20e\n",z1,z2);
printf("mpfr_ui_sub failed for y=%lu x=%1.20e with rnd_mode=%s\n",
y, x, mpfr_print_rnd_mode(rnd_mode));
exit(1);
}
mpfr_clear(xx); mpfr_clear(zz);
}
int main(argc,argv) int argc; char *argv[];
{
#ifdef TEST
double x; unsigned long y, N; int i,rnd_mode,rnd;
#ifdef __mips
/* 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
srand48(getpid());
N = (argc<2) ? 1000000 : atoi(argv[1]);
rnd_mode = (argc<3) ? -1 : atoi(argv[2]);
for (i=0;i<1000000;i++) {
x = drand();
y = lrand48();
if (ABS(x)>2.2e-307) {
/* avoid denormalized numbers and overflows */
rnd = (rnd_mode==-1) ? lrand48()%4 : rnd_mode;
check(y, x, rnd, 0.0);
}
}
#endif
check(1, 1.0/0.0, GMP_RNDN, -1.0/0.0);
check(1, -1.0/0.0, GMP_RNDN, 1.0/0.0);
check(1, 0.0/0.0, GMP_RNDN, 0.0/0.0);
check(1196426492, 1.4218093058435347e-3, GMP_RNDN, 1.1964264919985781e9);
check(1092583421, -1.0880649218158844e9, GMP_RNDN, 2.1806483428158845901e9);
check(948002822, 1.22191250737771397120e+20, GMP_RNDN,
-1.2219125073682338611e20);
check(832100416, 4.68311314939691330000e-215, GMP_RNDD,
8.3210041599999988079e8);
check(1976245324, 1.25296395864546893357e+232, GMP_RNDZ,
-1.2529639586454686577e232);
check(2128997392, -1.08496826129284207724e+187, GMP_RNDU,
1.0849682612928422704e187);
check(293607738, -1.9967571564050541e-5, GMP_RNDU, 2.9360773800002003e8);
check(354270183, 2.9469161763489528e3, GMP_RNDN, 3.5426723608382362e8);
return 0;
}
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