--- /dev/null
+/* Test file for mpfr_ui_pow and mpfr_ui_pow_ui.
+
+Copyright 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 <limits.h>
+
+#include "mpfr-test.h"
+
+static void
+test1 (void)
+{
+ mpfr_t x, y, z, a;
+ int res1, res2;
+
+ mpfr_init2 (x, 32);
+ mpfr_init2 (y, 65);
+ mpfr_init2 (z, 17);
+ mpfr_init2 (a, 17);
+
+ mpfr_set_str_binary (x, "-0.101110001001011011011e-9");
+ mpfr_ui_pow (y, 7, x, GMP_RNDN);
+
+ mpfr_set_prec (x, 40);
+ mpfr_set_str_binary (x, "-0.1100101100101111011001010010110011110110E-1");
+ mpfr_set_prec (y, 74);
+ mpfr_ui_pow (y, 8, x, GMP_RNDN);
+ mpfr_set_prec (x, 74);
+ mpfr_set_str_binary (x, "0.11100000010100111101000011111011011010011000011000101011010011010101000011E-1");
+ if (mpfr_cmp (x, y))
+ {
+ printf ("Error for input of 40 bits, output of 74 bits\n");
+ exit (1);
+ }
+
+ /* Check for ui_pow_ui */
+ mpfr_ui_pow_ui (x, 0, 1, GMP_RNDN);
+ MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x));
+ mpfr_ui_pow_ui (x, 0, 4, GMP_RNDN);
+ MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x));
+ res1 = mpfr_ui_pow_ui (z, 17, 42, GMP_RNDD);
+ mpfr_set_ui (x, 17, GMP_RNDN);
+ mpfr_set_ui (y, 42, GMP_RNDN);
+ res2 = mpfr_pow (a, x, y, GMP_RNDD);
+ if (mpfr_cmp (z, a) || res1 != res2)
+ {
+ printf ("Error for ui_pow_ui for 17^42\n"
+ "Inexact1 = %d Inexact2 = %d\n", res1, res2);
+ mpfr_dump (z);
+ mpfr_dump (a);
+ exit (1);
+ }
+ mpfr_set_prec (x, 2);
+ mpfr_ui_pow_ui (x, 65537, 65535, GMP_RNDN);
+ if (mpfr_cmp_str (x, "0.11E1048562", 2, GMP_RNDN) != 0)
+ {
+ printf ("Error for ui_pow_ui for 65537 ^65535 with 2 bits of precision\n");
+ mpfr_dump (x);
+ exit (1);
+ }
+ mpfr_clear (x);
+ mpfr_clear (y);
+ mpfr_clear (z);
+ mpfr_clear (a);
+}
+
+static void
+check1 (mpfr_ptr x, mp_prec_t prec, unsigned long nt, mp_rnd_t rnd)
+{
+ mpfr_t y, z, t;
+ int inexact, compare, compare2;
+ mp_prec_t yprec;
+ mp_exp_t err;
+
+ yprec = prec + 10;
+
+ mpfr_init (y);
+ mpfr_init (z);
+ mpfr_init (t);
+ mpfr_set_prec (y, yprec);
+ mpfr_set_prec (z, prec);
+ mpfr_set_prec (t, prec);
+
+ compare = mpfr_ui_pow (y, nt, x, rnd);
+ err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
+ if (mpfr_can_round (y, err, rnd, rnd, prec))
+ {
+ mpfr_set (t, y, rnd);
+ inexact = mpfr_ui_pow (z, nt, x, rnd);
+ if (mpfr_cmp (t, z))
+ {
+ printf ("results differ for x=");
+ mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
+ printf (" n=%lu", nt);
+ printf (" prec=%u rnd_mode=%s\n", (unsigned) prec,
+ mpfr_print_rnd_mode (rnd));
+ printf ("got ");
+ mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
+ puts ("");
+ printf ("expected ");
+ mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
+ puts ("");
+ printf ("approx ");
+ mpfr_print_binary (y);
+ puts ("");
+ exit (1);
+ }
+ compare2 = mpfr_cmp (t, y);
+ /* if rounding to nearest, cannot know the sign of t - f(x)
+ because of composed rounding: y = o(f(x)) and t = o(y) */
+ if ((rnd != GMP_RNDN) && (compare * compare2 >= 0))
+ compare = compare + compare2;
+ else
+ compare = inexact; /* cannot determine sign(t-f(x)) */
+ if (((inexact == 0) && (compare != 0)) ||
+ ((inexact > 0) && (compare <= 0)) ||
+ ((inexact < 0) && (compare >= 0)))
+ {
+ printf ("Wrong inexact flag for rnd=%s: expected %d, got %d\n",
+ mpfr_print_rnd_mode (rnd), compare, inexact);
+ printf ("x="); mpfr_print_binary (x); puts ("");
+ printf ("y="); mpfr_print_binary (y); puts ("");
+ printf ("t="); mpfr_print_binary (t); puts ("");
+ exit (1);
+ }
+ }
+
+ mpfr_clear (y);
+ mpfr_clear (z);
+ mpfr_clear (t);
+}
+
+int
+main (int argc, char *argv[])
+{
+ mpfr_t x, y;
+ unsigned long int n;
+
+ tests_start_mpfr ();
+
+ mpfr_init (x);
+ mpfr_init (y);
+
+ n = randlimb ();
+
+ MPFR_SET_INF(x);
+ mpfr_ui_pow (y, n, x, GMP_RNDN);
+ if(!MPFR_IS_INF(y))
+ {
+ printf ("evaluation of function in INF does not return INF\n");
+ exit (1);
+ }
+
+ MPFR_CHANGE_SIGN(x);
+ mpfr_ui_pow (y, n, x, GMP_RNDN);
+ if(!MPFR_IS_ZERO(y))
+ {
+ printf ("evaluation of function in -INF does not return 0");
+ exit (1);
+ }
+
+ MPFR_SET_NAN(x);
+ mpfr_ui_pow (y, n, x, GMP_RNDN);
+ if(!MPFR_IS_NAN(y))
+ {
+ printf ("evaluation of function in NAN does not return NAN");
+ exit (1);
+ }
+
+ test1 ();
+
+ {
+ mpfr_t z, t;
+ mp_prec_t prec;
+ mp_rnd_t rnd;
+ unsigned int n;
+
+ mp_prec_t p0=2, p1=100;
+ unsigned int N=20;
+
+ mpfr_init2 (z, 38);
+ mpfr_init2 (t, 6);
+
+ /* check exact power */
+ mpfr_set_str_binary (t, "0.110000E5");
+ mpfr_ui_pow (z, 3, t, GMP_RNDN);
+
+ mpfr_set_prec (x, 2);
+ mpfr_set_prec (y, 2);
+ mpfr_set_str (x, "-0.5", 10, GMP_RNDZ);
+ mpfr_ui_pow (y, 4, x, GMP_RNDD);
+ if (mpfr_cmp_ui_2exp(y, 1, -1))
+ {
+ fprintf (stderr, "Error for 4^(-0.5), prec=2, GMP_RNDD\n");
+ fprintf (stderr, "expected 0.5, got ");
+ mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
+ fprintf (stderr, "\n");
+ exit (1);
+ }
+
+ /* problem found by Kevin on spe175.testdrive.compaq.com
+ (03 Sep 2003) */
+ mpfr_set_prec (x, 2);
+ mpfr_set_prec (y, 2);
+ mpfr_set_str (x, "0.5", 10, GMP_RNDN);
+ mpfr_ui_pow (y, 398441521, x, GMP_RNDN);
+ if (mpfr_cmp_ui_2exp(y, 1, 14))
+ {
+ fprintf (stderr, "Error for 398441521^(0.5), prec=2, GMP_RNDN\n");
+ fprintf (stderr, "expected 1.0e14, got ");
+ mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
+ fprintf (stderr, "\n");
+ exit (1);
+ }
+
+ mpfr_clear (z);
+ mpfr_clear (t);
+
+ mpfr_set_prec (x, 2);
+ mpfr_set_str (x, "0.5", 10, GMP_RNDN);
+ check1 (x, 2, 398441521, GMP_RNDN); /* 398441521 = 19961^2 */
+
+ /* generic test */
+ for (prec = p0; prec <= p1; prec++)
+ {
+ mpfr_set_prec (x, prec);
+ for (n=0; n<N; n++)
+ {
+ int nt;
+ nt = randlimb () & INT_MAX;
+ mpfr_urandomb (x, RANDS);
+ rnd = RND_RAND ();
+ check1 (x, prec, nt, rnd);
+ }
+ }
+ }
+
+ mpfr_clear (x);
+ mpfr_clear (y);
+
+ tests_end_mpfr ();
+ return 0;
+}
projects / msp430-gcc.git / blobdiff