--- /dev/null
+/* Test file for mpfr_sub_ui
+
+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 <float.h>
+
+#include "mpfr-test.h"
+
+/* checks that x-y gives the right results with 53 bits of precision */
+static void
+check3 (const char *xs, unsigned long y, 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_sub_ui (zz, xx, y, rnd_mode);
+ if (mpfr_cmp_str1(zz, zs))
+ {
+ printf ("expected sum is %s, got ", zs);
+ mpfr_print_binary(zz);
+ printf ("\nmpfr_sub_ui failed for x=%s y=%lu with rnd_mode=%s\n",
+ xs, y, mpfr_print_rnd_mode (rnd_mode));
+ exit (1);
+ }
+ mpfr_clears (xx, zz, (mpfr_ptr) 0);
+}
+
+/* FastTwoSum: if EXP(x) >= EXP(y), u = o(x+y), v = o(u-x), w = o(y-v),
+ then x + y = u + w
+thus if u = o(y-x), v = o(u+x), w = o(v-y), then y-x = u-w */
+static void
+check_two_sum (mp_prec_t p)
+{
+ unsigned int x;
+ mpfr_t y, u, v, w;
+ mp_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 = GMP_RNDN;
+ inexact = mpfr_sub_ui (u, y, x, rnd);
+ mpfr_add_ui (v, u, x, rnd);
+ mpfr_sub (w, v, y, rnd);
+ /* as u - (y-x) = 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);
+
+ /* nan - 1 == nan */
+ mpfr_set_nan (x);
+ mpfr_sub_ui (y, x, 1L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_nan_p (y));
+
+ /* +inf - 1 == +inf */
+ mpfr_set_inf (x, 1);
+ mpfr_sub_ui (y, x, 1L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_inf_p (y));
+ MPFR_ASSERTN (mpfr_sgn (y) > 0);
+
+ /* -inf - 1 == -inf */
+ mpfr_set_inf (x, -1);
+ mpfr_sub_ui (y, x, 1L, GMP_RNDN);
+ MPFR_ASSERTN (mpfr_inf_p (y));
+ MPFR_ASSERTN (mpfr_sgn (y) < 0);
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+}
+
+#define TEST_FUNCTION mpfr_sub_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[])
+{
+ mp_prec_t p;
+ int k;
+
+ tests_start_mpfr ();
+
+ check_nans ();
+
+ for (p=2; p<200; p++)
+ for (k=0; k<200; k++)
+ check_two_sum (p);
+
+ check3 ("0.9999999999", 1, GMP_RNDN,
+ "-10000000827403709990903735160827636718750e-50");
+
+ test_generic_ui (2, 1000, 100);
+
+ tests_end_mpfr ();
+ return 0;
+}
projects / msp430-gcc.git / blobdiff