1 files changed, 136 insertions, 0 deletions
diff --git a/gmp-6.3.0/tests/mpf/t-get_d_2exp.c b/gmp-6.3.0/tests/mpf/t-get_d_2exp.c
new file mode 100644
index 0000000..b716cf8
--- /dev/null
+++ b/gmp-6.3.0/tests/mpf/t-get_d_2exp.c
@@ -0,0 +1,136 @@
+/* Test mpf_get_d_2exp.
+
+Copyright 2002, 2003, 2017, 2020 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library test suite.
+
+The GNU MP Library test suite is free software; you can redistribute it
+and/or modify it under the terms of the GNU 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 test suite 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 General
+Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+static void
+check_data (void)
+{
+  mpf_t   f;
+  double  got, want;
+  long    got_exp;
+  long    exp;
+  struct {
+    int base;
+    int shift;
+  } data[] = {
+   {-1, 1}, {-3, 2}, {-5, 3}, {-7, 3}, { 1, 1}, { 3, 2}, { 5, 3}, { 7, 3}
+  };
+
+  mpf_init2 (f, 3);
+
+  got = mpf_get_d_2exp (&got_exp, f);
+  if (got != 0 || got_exp != 0)
+    {
+      printf    ("mpf_get_d_2exp wrong on zero\n");
+      mpf_trace ("   f    ", f);
+      d_trace   ("   got  ", got);
+      printf    ("   got exp  %ld\n", got_exp);
+      abort();
+    }
+
+  for (exp = -513; exp <= 513; exp++)
+    {
+      size_t i;
+      for (i = 0; i < numberof (data); i++)
+	{
+	  want = (double) data[i].base / (1 << data[i].shift);
+	  mpf_set_d (f, want);
+
+	  if (exp >= 0)
+	    mpf_mul_2exp (f, f, exp);
+	  else
+	    mpf_div_2exp (f, f, -exp);
+
+	  got = mpf_get_d_2exp (&got_exp, f);
+	  if (got != want || got_exp != exp)
+	    {
+	      printf    ("mpf_get_d_2exp wrong on 2**%ld\n", exp);
+	      mpf_trace ("   f    ", f);
+	      d_trace   ("   want ", want);
+	      d_trace   ("   got  ", got);
+	      printf    ("   want exp %ld\n", 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_data ();
+  check_round ();
+
+  tests_end ();
+  exit (0);
+}