Imported gcc-4.4.3

[msp430-gcc.git] / gmp / tests / mpf / t-get_d_2exp.c

diff --git a/gmp/tests/mpf/t-get_d_2exp.c b/gmp/tests/mpf/t-get_d_2exp.c
new file mode 100644 (file)
index 0000000..91ab97e
--- /dev/null
+++ b/gmp/tests/mpf/t-get_d_2exp.c
@@ -0,0 +1,121 @@
+/* Test mpf_get_d_2exp.
+
+Copyright 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+static void
+check_onebit (void)
+{
+  static const long data[] = {
+    -513, -512, -511, -65, -64, -63, -32, -1,
+    0, 1, 32, 53, 54, 64, 128, 256, 511, 512, 513
+  };
+  mpf_t   f;
+  double  got, want;
+  long    got_exp, want_exp;
+  int     i;
+
+  mpf_init2 (f, 1024L);
+
+  for (i = 0; i < numberof (data); i++)
+    {
+      mpf_set_ui (f, 1L);
+      if (data[i] >= 0)
+        mpf_mul_2exp (f, f, data[i]);
+      else
+        mpf_div_2exp (f, f, -data[i]);
+      want = 0.5;
+      want_exp = data[i] + 1;
+
+      got = mpf_get_d_2exp (&got_exp, f);
+      if (got != want || got_exp != want_exp)
+        {
+          printf    ("mpf_get_d_2exp wrong on 2**%ld\n", data[i]);
+          mpf_trace ("   f    ", f);
+          d_trace   ("   want ", want);
+          d_trace   ("   got  ", got);
+          printf    ("   want exp %ld\n", want_exp);
+          printf    ("   got exp  %ld\n", got_exp);
+          abort();
+        }
+    }
+  mpf_clear (f);
+}
+
+/* Check that hardware rounding doesn't make mpf_get_d_2exp return a value
+   outside its defined range. */
+static void
+check_round (void)
+{
+  static const unsigned long data[] = { 1, 32, 53, 54, 64, 128, 256, 512 };
+  mpf_t   f;
+  double  got;
+  long    got_exp;
+  int     i, rnd_mode, old_rnd_mode;
+
+  mpf_init2 (f, 1024L);
+  old_rnd_mode = tests_hardware_getround ();
+
+  for (rnd_mode = 0; rnd_mode < 4; rnd_mode++)
+    {
+      tests_hardware_setround (rnd_mode);
+
+      for (i = 0; i < numberof (data); i++)
+        {
+          mpf_set_ui (f, 1L);
+          mpf_mul_2exp (f, f, data[i]);
+          mpf_sub_ui (f, f, 1L);
+
+          got = mpf_get_d_2exp (&got_exp, f);
+          if (got < 0.5 || got >= 1.0)
+            {
+              printf    ("mpf_get_d_2exp bad on 2**%lu-1\n", data[i]);
+              printf    ("result out of range, expect 0.5 <= got < 1.0\n");
+              printf    ("   rnd_mode = %d\n", rnd_mode);
+              printf    ("   data[i]  = %lu\n", data[i]);
+              mpf_trace ("   f    ", f);
+              d_trace   ("   got  ", got);
+              printf    ("   got exp  %ld\n", got_exp);
+              abort();
+            }
+        }
+    }
+
+  mpf_clear (f);
+  tests_hardware_setround (old_rnd_mode);
+}
+
+
+int
+main (void)
+{
+  tests_start ();
+  mp_trace_base = 16;
+
+  check_onebit ();
+  check_round ();
+
+  tests_end ();
+  exit (0);
+}