Imported gcc-4.4.3

[msp430-gcc.git] / mpfr / tests / tpow3.c

diff --git a/mpfr/tests/tpow3.c b/mpfr/tests/tpow3.c
new file mode 100644 (file)
index 0000000..5b02fba
--- /dev/null
+++ b/mpfr/tests/tpow3.c
@@ -0,0 +1,126 @@
+/* Test file for mpfr_pow.
+
+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 <limits.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+
+int
+main (int argc, char *argv[])
+{
+  mpfr_t x, y, z;
+
+  mp_prec_t prec, yprec;
+  mpfr_t t, s;
+  mp_rnd_t rnd;
+  int inexact, compare, compare2;
+  unsigned int n, err;
+
+  mp_prec_t p0=2, p1=100;
+  unsigned int N=25;
+
+  tests_start_mpfr ();
+
+  mpfr_init (x);
+  mpfr_init2 (y,sizeof(unsigned long int)*CHAR_BIT);
+  mpfr_init (z);
+
+  mpfr_init (s);
+  mpfr_init (t);
+
+  /* generic test */
+  for (prec = p0; prec <= p1; prec++)
+    {
+      mpfr_set_prec (x, prec);
+      mpfr_set_prec (s, sizeof(unsigned long int)*CHAR_BIT);
+      mpfr_set_prec (z, prec);
+      mpfr_set_prec (t, prec);
+      yprec = prec + 10;
+
+      for (n=0; n<N; n++)
+        {
+          mpfr_urandomb (x, RANDS);
+          mpfr_urandomb (s, RANDS);
+          if (randlimb () % 2)
+            mpfr_neg (s, s, GMP_RNDN);
+          rnd = RND_RAND ();
+          mpfr_set_prec (y, yprec);
+          compare = mpfr_pow (y, x, s, rnd);
+          err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
+          if (mpfr_can_round (y, err, rnd, rnd, prec))
+            {
+              mpfr_set (t, y, rnd);
+              inexact = mpfr_pow (z, x, s, rnd);
+              if (mpfr_cmp (t, z))
+                {
+                  printf ("results differ for x^y with x=");
+                  mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
+                  printf (" y=");
+                  mpfr_out_str (stdout, 2, 0, s, GMP_RNDN);
+                  printf (" prec=%u rnd_mode=%s\n", (unsigned int) 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 (s);
+  mpfr_clear (t);
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+  mpfr_clear (z);
+
+  tests_end_mpfr ();
+  return 0;
+}