--- /dev/null
+/* Test file for mpfr_div_ui.
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library 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.
+
+The GNU 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <float.h>
+
+#include "mpfr-test.h"
+
+static void
+check (const char *ds, unsigned long u, mp_rnd_t rnd, const char *es)
+{
+ mpfr_t x, y;
+
+ mpfr_init2 (x, 53);
+ mpfr_init2 (y, 53);
+ mpfr_set_str1 (x, ds);
+ mpfr_div_ui (y, x, u, rnd);
+ if (mpfr_cmp_str1 (y, es))
+ {
+ printf ("mpfr_div_ui failed for x=%s, u=%lu, rnd=%s\n", ds, u,
+ mpfr_print_rnd_mode (rnd));
+ printf ("expected result is %s, got", es);
+ mpfr_out_str(stdout, 10, 0, y, GMP_RNDN);
+ exit (1);
+ }
+ mpfr_clear (x);
+ mpfr_clear (y);
+}
+
+static void
+special (void)
+{
+ mpfr_t x, y;
+ unsigned xprec, yprec;
+
+ mpfr_init (x);
+ mpfr_init (y);
+
+ mpfr_set_prec (x, 32);
+ mpfr_set_prec (y, 32);
+ mpfr_set_ui (x, 1, GMP_RNDN);
+ mpfr_div_ui (y, x, 3, GMP_RNDN);
+
+ mpfr_set_prec (x, 100);
+ mpfr_set_prec (y, 100);
+ mpfr_urandomb (x, RANDS);
+ mpfr_div_ui (y, x, 123456, GMP_RNDN);
+ mpfr_set_ui (x, 0, GMP_RNDN);
+ mpfr_div_ui (y, x, 123456789, GMP_RNDN);
+ if (mpfr_cmp_ui (y, 0))
+ {
+ printf ("mpfr_div_ui gives non-zero for 0/ui\n");
+ exit (1);
+ }
+
+ /* bug found by Norbert Mueller, 21 Aug 2001 */
+ mpfr_set_prec (x, 110);
+ mpfr_set_prec (y, 60);
+ mpfr_set_str_binary (x, "0.110101110011111110011111001110011001110111000000111110001000111011000011E-44");
+ mpfr_div_ui (y, x, 17, GMP_RNDN);
+ mpfr_set_str_binary (x, "0.11001010100101100011101110000001100001010110101001010011011E-48");
+ if (mpfr_cmp (x, y))
+ {
+ printf ("Error in x/17 for x=1/16!\n");
+ printf ("Expected ");
+ mpfr_out_str (stdout, 2, 0, x, GMP_RNDN);
+ printf ("\nGot ");
+ mpfr_out_str (stdout, 2, 0, y, GMP_RNDN);
+ printf ("\n");
+ exit (1);
+ }
+
+ /* corner case */
+ mpfr_set_prec (x, 2 * mp_bits_per_limb);
+ mpfr_set_prec (y, 2);
+ mpfr_set_ui (x, 4, GMP_RNDN);
+ mpfr_nextabove (x);
+ mpfr_div_ui (y, x, 2, GMP_RNDN); /* exactly in the middle */
+ MPFR_ASSERTN(mpfr_cmp_ui (y, 2) == 0);
+
+ mpfr_set_prec (x, 3 * mp_bits_per_limb);
+ mpfr_set_prec (y, 2);
+ mpfr_set_ui (x, 2, GMP_RNDN);
+ mpfr_nextabove (x);
+ mpfr_div_ui (y, x, 2, GMP_RNDN);
+ MPFR_ASSERTN(mpfr_cmp_ui (y, 1) == 0);
+
+ mpfr_set_prec (x, 3 * mp_bits_per_limb);
+ mpfr_set_prec (y, 2);
+ mpfr_set_si (x, -4, GMP_RNDN);
+ mpfr_nextbelow (x);
+ mpfr_div_ui (y, x, 2, GMP_RNDD);
+ MPFR_ASSERTN(mpfr_cmp_si (y, -3) == 0);
+
+ for (xprec = 53; xprec <= 128; xprec++)
+ {
+ mpfr_set_prec (x, xprec);
+ mpfr_set_str_binary (x, "0.1100100100001111110011111000000011011100001100110111E2");
+ for (yprec = 53; yprec <= 128; yprec++)
+ {
+ mpfr_set_prec (y, yprec);
+ mpfr_div_ui (y, x, 1, GMP_RNDN);
+ if (mpfr_cmp(x,y))
+ {
+ printf ("division by 1.0 fails for xprec=%u, yprec=%u\n", xprec, yprec);
+ printf ("expected "); mpfr_print_binary (x); puts ("");
+ printf ("got "); mpfr_print_binary (y); puts ("");
+ exit (1);
+ }
+ }
+ }
+
+ /* Bug reported by Mark Dickinson, 6 Nov 2007 */
+ mpfr_set_si (x, 0, GMP_RNDN);
+ mpfr_set_si (y, -1, GMP_RNDN);
+ mpfr_div_ui (y, x, 4, GMP_RNDN);
+ MPFR_ASSERTN(MPFR_IS_ZERO(y) && MPFR_IS_POS(y));
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+}
+
+static void
+check_inexact (void)
+{
+ mpfr_t x, y, z;
+ mp_prec_t px, py;
+ int inexact, cmp;
+ unsigned long int u;
+ int rnd;
+
+ mpfr_init (x);
+ mpfr_init (y);
+ mpfr_init (z);
+
+ for (px=2; px<300; px++)
+ {
+ mpfr_set_prec (x, px);
+ mpfr_urandomb (x, RANDS);
+ do
+ {
+ u = randlimb ();
+ }
+ while (u == 0);
+ for (py=2; py<300; py++)
+ {
+ mpfr_set_prec (y, py);
+ mpfr_set_prec (z, py + mp_bits_per_limb);
+ for (rnd = 0; rnd < GMP_RND_MAX; rnd++)
+ {
+ inexact = mpfr_div_ui (y, x, u, (mp_rnd_t) rnd);
+ if (mpfr_mul_ui (z, y, u, (mp_rnd_t) rnd))
+ {
+ printf ("z <- y * u should be exact for u=%lu\n", u);
+ printf ("y="); mpfr_print_binary (y); puts ("");
+ printf ("z="); mpfr_print_binary (z); puts ("");
+ exit (1);
+ }
+ cmp = mpfr_cmp (z, x);
+ if (((inexact == 0) && (cmp != 0)) ||
+ ((inexact > 0) && (cmp <= 0)) ||
+ ((inexact < 0) && (cmp >= 0)))
+ {
+ printf ("Wrong inexact flag for u=%lu, rnd=%s\n", u,
+ mpfr_print_rnd_mode ((mp_rnd_t) rnd));
+ printf ("x="); mpfr_print_binary (x); puts ("");
+ printf ("y="); mpfr_print_binary (y); puts ("");
+ exit (1);
+ }
+ }
+ }
+ }
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+ mpfr_clear (z);
+}
+
+#define TEST_FUNCTION mpfr_div_ui
+#define INTEGER_TYPE unsigned long
+#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1)
+#include "tgeneric_ui.c"
+
+int
+main (int argc, char **argv)
+{
+ mpfr_t x;
+
+ tests_start_mpfr ();
+
+ special ();
+
+ check_inexact ();
+
+ check("1.0", 3, GMP_RNDN, "3.3333333333333331483e-1");
+ check("1.0", 3, GMP_RNDZ, "3.3333333333333331483e-1");
+ check("1.0", 3, GMP_RNDU, "3.3333333333333337034e-1");
+ check("1.0", 3, GMP_RNDD, "3.3333333333333331483e-1");
+ check("1.0", 2116118, GMP_RNDN, "4.7256343927890600483e-7");
+ check("1.098612288668109782", 5, GMP_RNDN, "0.21972245773362195087");
+
+ mpfr_init2 (x, 53);
+ mpfr_set_ui (x, 3, GMP_RNDD);
+ mpfr_log (x, x, GMP_RNDD);
+ mpfr_div_ui (x, x, 5, GMP_RNDD);
+ if (mpfr_cmp_str1 (x, "0.21972245773362189536"))
+ {
+ printf ("Error in mpfr_div_ui for x=ln(3), u=5\n");
+ exit (1);
+ }
+ mpfr_clear (x);
+
+ test_generic_ui (2, 200, 100);
+
+ tests_end_mpfr ();
+ return 0;
+}
projects / msp430-gcc.git / blobdiff