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-rw-r--r--tests/tui_sub.c301
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diff --git a/tests/tui_sub.c b/tests/tui_sub.c
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+/* Test file for mpfr_ui_sub.
+
+Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+Contributed by the AriC and Caramel 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 3 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.LESSER. If not, see
+http://www.gnu.org/licenses/ or 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
+special (void)
+{
+ mpfr_t x, y, res;
+ int inexact;
+
+ mpfr_init (x);
+ mpfr_init (y);
+ mpfr_init (res);
+
+ mpfr_set_prec (x, 24);
+ mpfr_set_prec (y, 24);
+ mpfr_set_str_binary (y, "0.111100110001011010111");
+ inexact = mpfr_ui_sub (x, 1, y, MPFR_RNDN);
+ if (inexact)
+ {
+ printf ("Wrong inexact flag: got %d, expected 0\n", inexact);
+ exit (1);
+ }
+
+ mpfr_set_prec (x, 24);
+ mpfr_set_prec (y, 24);
+ mpfr_set_str_binary (y, "0.111100110001011010111");
+ if ((inexact = mpfr_ui_sub (x, 38181761, y, MPFR_RNDN)) >= 0)
+ {
+ printf ("Wrong inexact flag: got %d, expected -1\n", inexact);
+ exit (1);
+ }
+
+ mpfr_set_prec (x, 63);
+ mpfr_set_prec (y, 63);
+ mpfr_set_str_binary (y, "0.111110010010100100110101101010001001100101110001000101110111111E-1");
+ if ((inexact = mpfr_ui_sub (x, 1541116494, y, MPFR_RNDN)) <= 0)
+ {
+ printf ("Wrong inexact flag: got %d, expected +1\n", inexact);
+ exit (1);
+ }
+
+ mpfr_set_prec (x, 32);
+ mpfr_set_prec (y, 32);
+ mpfr_set_str_binary (y, "0.11011000110111010001011100011100E-1");
+ if ((inexact = mpfr_ui_sub (x, 2000375416, y, MPFR_RNDN)) >= 0)
+ {
+ printf ("Wrong inexact flag: got %d, expected -1\n", inexact);
+ exit (1);
+ }
+
+ mpfr_set_prec (x, 24);
+ mpfr_set_prec (y, 24);
+ mpfr_set_str_binary (y, "0.110011011001010011110111E-2");
+ if ((inexact = mpfr_ui_sub (x, 927694848, y, MPFR_RNDN)) <= 0)
+ {
+ printf ("Wrong inexact flag: got %d, expected +1\n", inexact);
+ exit (1);
+ }
+
+ /* bug found by Mathieu Dutour, 12 Apr 2001 */
+ mpfr_set_prec (x, 5);
+ mpfr_set_prec (y, 5);
+ mpfr_set_prec (res, 5);
+ mpfr_set_str_binary (x, "1e-12");
+
+ mpfr_ui_sub (y, 1, x, MPFR_RNDD);
+ mpfr_set_str_binary (res, "0.11111");
+ if (mpfr_cmp (y, res))
+ {
+ printf ("Error in mpfr_ui_sub (y, 1, x, MPFR_RNDD) for x=2^(-12)\nexpected 1.1111e-1, got ");
+ mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN);
+ printf ("\n");
+ exit (1);
+ }
+
+ mpfr_ui_sub (y, 1, x, MPFR_RNDU);
+ mpfr_set_str_binary (res, "1.0");
+ if (mpfr_cmp (y, res))
+ {
+ printf ("Error in mpfr_ui_sub (y, 1, x, MPFR_RNDU) for x=2^(-12)\n"
+ "expected 1.0, got ");
+ mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN);
+ printf ("\n");
+ exit (1);
+ }
+
+ mpfr_ui_sub (y, 1, x, MPFR_RNDN);
+ mpfr_set_str_binary (res, "1.0");
+ if (mpfr_cmp (y, res))
+ {
+ printf ("Error in mpfr_ui_sub (y, 1, x, MPFR_RNDN) for x=2^(-12)\n"
+ "expected 1.0, got ");
+ mpfr_out_str (stdout, 2, 0, y, MPFR_RNDN);
+ printf ("\n");
+ exit (1);
+ }
+
+ mpfr_set_prec (x, 10);
+ mpfr_set_prec (y, 10);
+ mpfr_urandomb (x, RANDS);
+ mpfr_ui_sub (y, 0, x, MPFR_RNDN);
+ if (MPFR_IS_ZERO(x))
+ MPFR_ASSERTN(MPFR_IS_ZERO(y));
+ else
+ MPFR_ASSERTN(mpfr_cmpabs (x, y) == 0 && mpfr_sgn (x) != mpfr_sgn (y));
+
+ mpfr_set_prec (x, 73);
+ mpfr_set_str_binary (x, "0.1101111010101011011011100011010000000101110001011111001011011000101111101E-99");
+ mpfr_ui_sub (x, 1, x, MPFR_RNDZ);
+ mpfr_nextabove (x);
+ MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0);
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+ mpfr_clear (res);
+}
+
+/* checks that (y-x) gives the right results with 53 bits of precision */
+static void
+check (unsigned long y, const char *xs, mpfr_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_sub (zz, y, xx, rnd_mode);
+ if (mpfr_cmp_str1 (zz, zs) )
+ {
+ printf ("expected difference is %s, got\n",zs);
+ mpfr_out_str(stdout, 10, 0, zz, MPFR_RNDN);
+ printf ("mpfr_ui_sub 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);
+}
+
+/* if u = o(x-y), v = o(u-x), w = o(v+y), then x-y = u-w */
+static void
+check_two_sum (mpfr_prec_t p)
+{
+ unsigned int x;
+ mpfr_t y, u, v, w;
+ mpfr_rnd_t rnd;
+ int inexact;
+
+ mpfr_inits2 (p, y, u, v, w, (mpfr_ptr) 0);
+ do
+ {
+ x = randlimb ();
+ }
+ while (x < 1);
+ mpfr_urandomb (y, RANDS);
+ rnd = MPFR_RNDN;
+ inexact = mpfr_ui_sub (u, x, y, rnd);
+ mpfr_sub_ui (v, u, x, rnd);
+ mpfr_add (w, v, y, rnd);
+ /* as u = (x-y) + w, we should have inexact and w of same sign */
+ if (((inexact == 0) && mpfr_cmp_ui (w, 0)) ||
+ ((inexact > 0) && (mpfr_cmp_ui (w, 0) <= 0)) ||
+ ((inexact < 0) && (mpfr_cmp_ui (w, 0) >= 0)))
+ {
+ printf ("Wrong inexact flag for prec=%u, rnd=%s\n",
+ (unsigned int) p, mpfr_print_rnd_mode (rnd));
+ printf ("x=%u\n", x);
+ printf ("y="); mpfr_print_binary(y); puts ("");
+ printf ("u="); mpfr_print_binary(u); puts ("");
+ printf ("v="); mpfr_print_binary(v); puts ("");
+ printf ("w="); mpfr_print_binary(w); puts ("");
+ printf ("inexact = %d\n", inexact);
+ exit (1);
+ }
+ mpfr_clears (y, u, v, w, (mpfr_ptr) 0);
+}
+
+static void
+check_nans (void)
+{
+ mpfr_t x, y;
+
+ mpfr_init2 (x, 123L);
+ mpfr_init2 (y, 123L);
+
+ /* 1 - nan == nan */
+ mpfr_set_nan (x);
+ mpfr_ui_sub (y, 1L, x, MPFR_RNDN);
+ MPFR_ASSERTN (mpfr_nan_p (y));
+
+ /* 1 - +inf == -inf */
+ mpfr_set_inf (x, 1);
+ mpfr_ui_sub (y, 1L, x, MPFR_RNDN);
+ MPFR_ASSERTN (mpfr_inf_p (y));
+ MPFR_ASSERTN (mpfr_sgn (y) < 0);
+
+ /* 1 - -inf == +inf */
+ mpfr_set_inf (x, -1);
+ mpfr_ui_sub (y, 1L, x, MPFR_RNDN);
+ MPFR_ASSERTN (mpfr_inf_p (y));
+ MPFR_ASSERTN (mpfr_sgn (y) > 0);
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+}
+
+/* Check mpfr_ui_sub with u = 0 (unsigned). */
+static void check_neg (void)
+{
+ mpfr_t x, yneg, ysub;
+ int i, s;
+ int r;
+
+ mpfr_init2 (x, 64);
+ mpfr_init2 (yneg, 32);
+ mpfr_init2 (ysub, 32);
+
+ for (i = 0; i <= 25; i++)
+ {
+ mpfr_sqrt_ui (x, i, MPFR_RNDN);
+ for (s = 0; s <= 1; s++)
+ {
+ RND_LOOP (r)
+ {
+ int tneg, tsub;
+
+ tneg = mpfr_neg (yneg, x, (mpfr_rnd_t) r);
+ tsub = mpfr_ui_sub (ysub, 0, x, (mpfr_rnd_t) r);
+ MPFR_ASSERTN (mpfr_equal_p (yneg, ysub));
+ MPFR_ASSERTN (!(MPFR_IS_POS (yneg) ^ MPFR_IS_POS (ysub)));
+ MPFR_ASSERTN (tneg == tsub);
+ }
+ mpfr_neg (x, x, MPFR_RNDN);
+ }
+ }
+
+ mpfr_clear (x);
+ mpfr_clear (yneg);
+ mpfr_clear (ysub);
+}
+
+int
+main (int argc, char *argv[])
+{
+ mpfr_prec_t p;
+ unsigned k;
+
+ tests_start_mpfr ();
+
+ check_nans ();
+
+ special ();
+ for (p=2; p<100; p++)
+ for (k=0; k<100; k++)
+ check_two_sum (p);
+
+ check(1196426492, "1.4218093058435347e-3", MPFR_RNDN,
+ "1.1964264919985781e9");
+ check(1092583421, "-1.0880649218158844e9", MPFR_RNDN,
+ "2.1806483428158845901e9");
+ check(948002822, "1.22191250737771397120e+20", MPFR_RNDN,
+ "-1.2219125073682338611e20");
+ check(832100416, "4.68311314939691330000e-215", MPFR_RNDD,
+ "8.3210041599999988079e8");
+ check(1976245324, "1.25296395864546893357e+232", MPFR_RNDZ,
+ "-1.2529639586454686577e232");
+ check(2128997392, "-1.08496826129284207724e+187", MPFR_RNDU,
+ "1.0849682612928422704e187");
+ check(293607738, "-1.9967571564050541e-5", MPFR_RNDU,
+ "2.9360773800002003e8");
+ check(354270183, "2.9469161763489528e3", MPFR_RNDN,
+ "3.5426723608382362e8");
+
+ check_neg ();
+
+ tests_end_mpfr ();
+ return 0;
+}
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