1 files changed, 262 insertions, 0 deletions
diff --git a/tests/tui_pow.c b/tests/tui_pow.c
new file mode 100644
index 0000000..c2d9ca6
--- /dev/null
+++ b/tests/tui_pow.c
@@ -0,0 +1,262 @@
+/* Test file for mpfr_ui_pow and mpfr_ui_pow_ui.
+
+Copyright 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 <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, MPFR_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, MPFR_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, MPFR_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x));
+  mpfr_ui_pow_ui (x, 0, 4, MPFR_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x));
+  res1 = mpfr_ui_pow_ui (z, 17, 42, MPFR_RNDD);
+  mpfr_set_ui (x, 17, MPFR_RNDN);
+  mpfr_set_ui (y, 42, MPFR_RNDN);
+  res2 = mpfr_pow (a, x, y, MPFR_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, MPFR_RNDN);
+  if (mpfr_cmp_str (x, "0.11E1048562", 2, MPFR_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, mpfr_prec_t prec, unsigned long nt, mpfr_rnd_t rnd)
+{
+  mpfr_t y, z, t;
+  int inexact, compare, compare2;
+  mpfr_prec_t yprec;
+  mpfr_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 == MPFR_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, MPFR_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, MPFR_RNDN);
+          puts ("");
+          printf ("expected ");
+          mpfr_out_str (stdout, 2, prec, t, MPFR_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 != MPFR_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, MPFR_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, MPFR_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, MPFR_RNDN);
+  if(!MPFR_IS_NAN(y))
+    {
+      printf ("evaluation of function in NAN does not return NAN");
+      exit (1);
+    }
+
+  test1 ();
+
+  {
+  mpfr_t z, t;
+  mpfr_prec_t prec;
+  mpfr_rnd_t rnd;
+  unsigned int n;
+
+  mpfr_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, MPFR_RNDN);
+
+  mpfr_set_prec (x, 2);
+  mpfr_set_prec (y, 2);
+  mpfr_set_str (x, "-0.5", 10, MPFR_RNDZ);
+  mpfr_ui_pow (y, 4, x, MPFR_RNDD);
+  if (mpfr_cmp_ui_2exp(y, 1, -1))
+    {
+      fprintf (stderr, "Error for 4^(-0.5), prec=2, MPFR_RNDD\n");
+      fprintf (stderr, "expected 0.5, got ");
+      mpfr_out_str (stderr, 2, 0, y, MPFR_RNDN);
+      fprintf (stderr, "\n");
+      exit (1);
+    }
+
+  /* problem found by Kevin on spe175.testdrive.compaq.com
+     (03 Sep 2003), ia64 under HP-UX */
+  mpfr_set_prec (x, 2);
+  mpfr_set_prec (y, 2);
+  mpfr_set_str (x, "0.5", 10, MPFR_RNDN);
+  mpfr_ui_pow (y, 398441521, x, MPFR_RNDN);
+  if (mpfr_cmp_ui_2exp(y, 1, 14))
+    {
+      fprintf (stderr, "Error for 398441521^(0.5), prec=2, MPFR_RNDN\n");
+      fprintf (stderr, "expected 1.0e14, got ");
+      mpfr_out_str (stderr, 2, 0, y, MPFR_RNDN);
+      fprintf (stderr, "\n");
+      exit (1);
+    }
+
+  mpfr_clear (z);
+  mpfr_clear (t);
+
+  mpfr_set_prec (x, 2);
+  mpfr_set_str (x, "0.5", 10, MPFR_RNDN);
+  check1 (x, 2, 398441521, MPFR_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;
+}