Imported gcc-4.4.3

[msp430-gcc.git] / mpfr / tests / tconst_log2.c

diff --git a/mpfr/tests/tconst_log2.c b/mpfr/tests/tconst_log2.c
new file mode 100644 (file)
index 0000000..a48614c
--- /dev/null
+++ b/mpfr/tests/tconst_log2.c
@@ -0,0 +1,201 @@
+/* Test file for mpfr_const_log2.
+
+Copyright 1999, 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 "mpfr-test.h"
+
+/* tlog2 [prec] [rnd] [0 = no print] */
+
+static void
+check (mp_prec_t p0, mp_prec_t p1)
+{
+  mpfr_t x, y, z;
+  mp_rnd_t rnd;
+  int dif;
+
+  mpfr_init (x);
+  mpfr_init (y);
+  mpfr_init2 (z, p1 + 10);
+  mpfr_const_log2 (z, GMP_RNDN);
+  mpfr_clear_cache (__gmpfr_cache_const_log2);
+
+  for (; p0<=p1; p0++)
+    {
+      mpfr_set_prec (x, p0);
+      mpfr_set_prec (y, p0);
+        {
+          rnd = RND_RAND ();
+          mpfr_const_log2 (x, rnd);
+          mpfr_set (y, z, rnd);
+          if ((dif = mpfr_cmp (x, y))
+              && mpfr_can_round (z, mpfr_get_prec(z), GMP_RNDN,
+                                                 rnd, p0))
+            {
+              printf ("mpfr_const_log2 fails for prec=%u, rnd=%s Diff=%d\n",
+                      (unsigned int) p0, mpfr_print_rnd_mode (rnd), dif);
+              printf ("expected "), mpfr_dump (y);
+              printf ("got      "), mpfr_dump (x);
+              exit (1);
+            }
+        }
+    }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+  mpfr_clear (z);
+}
+
+static void
+check_large (void)
+{
+  mpfr_t x, y;
+  mpfr_init2 (x, 25000);
+  mpfr_init2 (y, 26000);
+  (mpfr_const_log2) (x, GMP_RNDN); /* First one ! */
+  (mpfr_const_log2) (y, GMP_RNDN); /* Then the other - cache - */
+  mpfr_prec_round (y, 25000, GMP_RNDN);
+  if (mpfr_cmp (x, y))
+    {
+      printf ("const_log2: error for large prec\n");
+      exit (1);
+    }
+
+  /* worst-case with 15 successive ones after last bit,
+     to exercise can_round loop */
+  mpfr_set_prec (x, 26249);
+  mpfr_const_log2 (x, GMP_RNDZ);
+
+  mpfr_clears (x, y, (mpfr_ptr) 0);
+}
+
+static void
+check_cache (void)
+{
+  mpfr_t x;
+  int i;
+
+  mpfr_init2 (x, 195);
+  mpfr_free_cache ();
+  i = mpfr_const_log2 (x, GMP_RNDN);
+  if (i == 0)
+    {
+      printf("Error for log2. Invalid ternary value (1).\n");
+      exit (1);
+    }
+  mpfr_set_prec (x, 194);
+  i = mpfr_const_log2 (x, GMP_RNDN);
+  if (i == 0)
+    {
+      printf("Error for log2. Invalid ternary value (2).\n");
+      exit (1);
+    }
+
+  mpfr_free_cache ();
+  mpfr_set_prec (x, 9);
+  mpfr_const_log2 (x, GMP_RNDN);
+  mpfr_set_prec (x, 8);
+  mpfr_const_log2 (x, GMP_RNDN);
+  if (mpfr_cmp_str (x, "0.10110001E0", 2, GMP_RNDN))
+    {
+      printf("Error for log2. Wrong rounding.\n");
+      exit (1);
+    }
+
+  mpfr_clear (x);
+}
+
+/* Wrapper for tgeneric */
+static int
+my_const_log2 (mpfr_ptr x, mpfr_srcptr y, mp_rnd_t r)
+{
+  return mpfr_const_log2 (x, r);
+}
+
+#define RAND_FUNCTION(x) mpfr_set_ui ((x), 0, GMP_RNDN)
+#define TEST_FUNCTION my_const_log2
+#include "tgeneric.c"
+
+int
+main (int argc, char *argv[])
+{
+  mpfr_t x;
+  int p;
+  mp_rnd_t rnd;
+
+  tests_start_mpfr ();
+
+  p = (argc>1) ? atoi(argv[1]) : 53;
+  rnd = (argc>2) ? (mp_rnd_t) atoi(argv[2]) : GMP_RNDZ;
+
+  mpfr_init (x);
+
+  check (2, 1000);
+
+  /* check precision of 2 bits */
+  mpfr_set_prec (x, 2);
+  mpfr_const_log2 (x, GMP_RNDN);
+  if (mpfr_cmp_ui_2exp(x, 3, -2)) /* 3*2^-2 */
+    {
+      printf ("mpfr_const_log2 failed for prec=2, rnd=GMP_RNDN\n"
+              "expected 0.75, got ");
+      mpfr_out_str(stdout, 10, 0, x, GMP_RNDN);
+      putchar('\n');
+      exit (1);
+    }
+
+  if (argc>=2)
+    {
+      mpfr_set_prec (x, p);
+      mpfr_const_log2 (x, rnd);
+      printf ("log(2)=");
+      mpfr_out_str (stdout, 10, 0, x, rnd);
+      puts ("");
+    }
+
+  mpfr_set_prec (x, 53);
+  mpfr_const_log2 (x, GMP_RNDZ);
+  if (mpfr_cmp_str1 (x, "6.9314718055994530941e-1") )
+    {
+      printf ("mpfr_const_log2 failed for prec=53\n");
+      exit (1);
+    }
+
+  mpfr_set_prec (x, 32);
+  mpfr_const_log2 (x, GMP_RNDN);
+  if (mpfr_cmp_str1 (x, "0.69314718060195446"))
+    {
+      printf ("mpfr_const_log2 failed for prec=32\n");
+      exit (1);
+    }
+
+  mpfr_clear(x);
+
+  check_large();
+  check_cache ();
+
+  test_generic (2, 200, 1);
+
+  tests_end_mpfr ();
+  return 0;
+}