--- /dev/null
+/* Test file for mpfr_ui_div.
+
+Copyright 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 "mpfr-test.h"
+
+/* checks that y/x gives the right result with 53 bits of precision */
+static void
+check (unsigned long y, const char *xs, mp_rnd_t rnd_mode, const char *zs)
+{
+ mpfr_t xx, zz;
+
+ mpfr_inits2 (53, xx, zz, (mpfr_ptr) 0);
+ mpfr_set_str1 (xx, xs);
+ mpfr_ui_div (zz, y, xx, rnd_mode);
+ if (mpfr_cmp_str1(zz, zs))
+ {
+ printf ("expected quotient is %s, got ", zs);
+ mpfr_out_str (stdout, 10, 0, zz, GMP_RNDN);
+ printf ("mpfr_ui_div failed for y=%lu x=%s with rnd_mode=%s\n",
+ y, xs, mpfr_print_rnd_mode (rnd_mode));
+ exit (1);
+ }
+ mpfr_clears (xx, zz, (mpfr_ptr) 0);
+}
+
+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);
+ do
+ {
+ mpfr_urandomb (x, RANDS);
+ }
+ while (mpfr_cmp_ui (x, 0) == 0);
+ u = randlimb ();
+ for (py=2; py<300; py++)
+ {
+ mpfr_set_prec (y, py);
+ mpfr_set_prec (z, py + px);
+ for (rnd = 0; rnd < GMP_RND_MAX; rnd++)
+ {
+ inexact = mpfr_ui_div (y, u, x, (mp_rnd_t) rnd);
+ if (mpfr_mul (z, y, x, (mp_rnd_t) rnd))
+ {
+ printf ("z <- y * x should be exact\n");
+ exit (1);
+ }
+ cmp = mpfr_cmp_ui (z, u);
+ 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 ("expected %d, got %d\n", cmp, inexact);
+ printf ("x="); mpfr_print_binary (x); puts ("");
+ printf ("y="); mpfr_print_binary (y); puts ("");
+ printf ("y*x="); mpfr_print_binary (z); puts ("");
+ exit (1);
+ }
+ }
+ }
+ }
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+ mpfr_clear (z);
+}
+
+static void
+check_nan (void)
+{
+ mpfr_t d, q;
+
+ mpfr_init2 (d, 100L);
+ mpfr_init2 (q, 100L);
+
+ /* 1/+inf == 0 */
+ MPFR_CLEAR_FLAGS (d);
+ MPFR_SET_INF (d);
+ MPFR_SET_POS (d);
+ MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_number_p (q));
+ MPFR_ASSERTN (mpfr_sgn (q) == 0);
+
+ /* 1/-inf == -0 */
+ MPFR_CLEAR_FLAGS (d);
+ MPFR_SET_INF (d);
+ MPFR_SET_NEG (d);
+ MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_number_p (q));
+ MPFR_ASSERTN (mpfr_sgn (q) == 0);
+
+ /* 1/nan == nan */
+ MPFR_SET_NAN (d);
+ MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_nan_p (q));
+
+ /* 0/0 == nan */
+ mpfr_set_ui (d, 0L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_nan_p (q));
+
+ /* 1/+0 = +inf */
+ mpfr_set_ui (d, 0L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_inf_p (q) && mpfr_sgn (q) > 0);
+
+ /* 1/-0 = -inf */
+ mpfr_set_ui (d, 0L, GMP_RNDN);
+ mpfr_neg (d, d, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_ui_div (q, 1L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_inf_p (q) && mpfr_sgn (q) < 0);
+
+ /* 0/1 = +0 */
+ mpfr_set_ui (d, 1L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_cmp_ui (q, 0) == 0 && MPFR_IS_POS (q));
+
+ /* 0/-1 = -0 */
+ mpfr_set_si (d, -1, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_ui_div (q, 0L, d, GMP_RNDZ) == 0); /* exact */
+ MPFR_ASSERTN (mpfr_cmp_ui (q, 0) == 0 && MPFR_IS_NEG (q));
+
+ mpfr_clear (d);
+ mpfr_clear (q);
+}
+
+static int
+mpfr_inv (mpfr_ptr y, mpfr_srcptr x, mp_rnd_t r)
+{
+ return mpfr_ui_div (y, 1, x, r);
+}
+
+int
+main (int argc, char *argv[])
+{
+ tests_start_mpfr ();
+
+ check_nan ();
+ check_inexact ();
+ check(948002822, "1.22191250737771397120e+20", GMP_RNDN,
+ "7.758352715731357946e-12");
+ check(1976245324, "1.25296395864546893357e+232", GMP_RNDZ,
+ "1.5772563211925444801e-223");
+ check(740454110, "2.11496253355831863313e+183", GMP_RNDZ,
+ "3.5010270784996976041e-175");
+ check(1690540942, "1.28278599852446657468e-276", GMP_RNDU,
+ "1.3178666932321966062e285");
+ check(1476599377, "-2.14191393656148625995e+305", GMP_RNDD,
+ "-6.8938315017943889615e-297");
+
+ /* inv is for 1/x */
+ data_check ("data/inv", mpfr_inv, "mpfr_ui_div(1,x)");
+
+ tests_end_mpfr ();
+ return 0;
+}
projects / msp430-gcc.git / blobdiff