Import http://www.mpfr.org/mpfr-current/mpfr-3.1.4.tar.bz2

1 files changed, 315 insertions, 0 deletions

diff --git a/mpfr/tests/tset_ld.c b/mpfr/tests/tset_ld.c
new file mode 100644
index 0000000000..6e2b931f57
--- /dev/null
+++ b/mpfr/tests/tset_ld.c
@@ -0,0 +1,315 @@
+/* Test file for mpfr_set_ld and mpfr_get_ld.
+
+Copyright 2002-2016 Free Software Foundation, Inc.
+Contributed by the AriC and Caramba 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 <float.h>
+#include <limits.h>
+#ifdef WITH_FPU_CONTROL
+#include <fpu_control.h>
+#endif
+
+#include "mpfr-test.h"
+
+static void
+check_gcc33_bug (void)
+{
+  volatile long double x;
+  x = (long double) 9007199254740992.0 + 1.0;
+  if (x != 0.0)
+    return;  /* OK */
+  printf
+    ("Detected optimization bug of gcc 3.3 on Alpha concerning long double\n"
+     "comparisons; set_ld tests might fail (set_ld won't work correctly).\n"
+     "See http://gcc.gnu.org/ml/gcc-bugs/2003-10/msg00853.html for more\n"
+     "information.\n");
+}
+
+static int
+Isnan_ld (long double d)
+{
+  /* Do not convert d to double as this can give an overflow, which
+     may confuse compilers without IEEE 754 support (such as clang
+     -fsanitize=undefined), or trigger a trap if enabled.
+     The DOUBLE_ISNAN macro should work fine on long double. */
+  if (DOUBLE_ISNAN (d))
+    return 1;
+  LONGDOUBLE_NAN_ACTION (d, goto yes);
+  return 0;
+ yes:
+  return 1;
+}
+
+/* checks that a long double converted to a mpfr (with precision >=113),
+   then converted back to a long double gives the initial value,
+   or in other words mpfr_get_ld(mpfr_set_ld(d)) = d.
+*/
+static void
+check_set_get (long double d, mpfr_t x)
+{
+  int r;
+  long double e;
+  int inex;
+
+  for (r = 0; r < MPFR_RND_MAX; r++)
+    {
+      inex = mpfr_set_ld (x, d, (mpfr_rnd_t) r);
+      if (inex != 0)
+        {
+          mpfr_exp_t emin, emax;
+          emin = mpfr_get_emin ();
+          emax = mpfr_get_emax ();
+          printf ("Error: mpfr_set_ld should be exact\n");
+          printf ("d=%1.30Le inex=%d\n", d, inex);
+          if (emin >= LONG_MIN)
+            printf ("emin=%ld\n", (long) emin);
+          if (emax <= LONG_MAX)
+            printf ("emax=%ld\n", (long) emax);
+          mpfr_dump (x);
+          exit (1);
+        }
+      e = mpfr_get_ld (x, (mpfr_rnd_t) r);
+      if ((Isnan_ld(d) && ! Isnan_ld(e)) ||
+          (Isnan_ld(e) && ! Isnan_ld(d)) ||
+          (e != d && !(Isnan_ld(e) && Isnan_ld(d))))
+        {
+          printf ("Error: mpfr_get_ld o mpfr_set_ld <> Id\n");
+          printf ("  r=%d\n", r);
+          printf ("  d=%1.30Le get_ld(set_ld(d))=%1.30Le\n", d, e);
+          ld_trace ("  d", d);
+          printf ("  x="); mpfr_out_str (NULL, 16, 0, x, MPFR_RNDN);
+          printf ("\n");
+          ld_trace ("  e", e);
+#ifdef MPFR_NANISNAN
+          if (Isnan_ld(d) || Isnan_ld(e))
+            printf ("The reason is that NAN == NAN. Please look at the "
+                    "configure output\nand Section \"In case of problem\" "
+                    "of the INSTALL file.\n");
+#endif
+          exit (1);
+        }
+    }
+}
+
+static void
+test_small (void)
+{
+  mpfr_t x, y, z;
+  long double d;
+
+  mpfr_init2 (x, 64);
+  mpfr_init2 (y, 64);
+  mpfr_init2 (z, 64);
+
+  /* x = 11906603631607553907/2^(16381+64) */
+  mpfr_set_str (x, "0.1010010100111100110000001110101101000111010110000001111101110011E-16381", 2, MPFR_RNDN);
+  d = mpfr_get_ld (x, MPFR_RNDN);  /* infinite loop? */
+  mpfr_set_ld (y, d, MPFR_RNDN);
+  mpfr_sub (z, x, y, MPFR_RNDN);
+  mpfr_abs (z, z, MPFR_RNDN);
+  mpfr_clear_erangeflag ();
+  /* If long double = double, d should be equal to 0;
+     in this case, everything is OK. */
+  if (d != 0 && (mpfr_cmp_str (z, "1E-16434", 2, MPFR_RNDN) > 0 ||
+                 mpfr_erangeflag_p ()))
+    {
+      printf ("Error with x = ");
+      mpfr_out_str (NULL, 10, 21, x, MPFR_RNDN);
+      printf (" = ");
+      mpfr_out_str (NULL, 16, 0, x, MPFR_RNDN);
+      printf ("\n        -> d = %.21Lg", d);
+      printf ("\n        -> y = ");
+      mpfr_out_str (NULL, 10, 21, y, MPFR_RNDN);
+      printf (" = ");
+      mpfr_out_str (NULL, 16, 0, y, MPFR_RNDN);
+      printf ("\n        -> |x-y| = ");
+      mpfr_out_str (NULL, 16, 0, z, MPFR_RNDN);
+      printf ("\n");
+      exit (1);
+    }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+  mpfr_clear (z);
+}
+
+static void
+test_fixed_bugs (void)
+{
+  mpfr_t x;
+  long double l, m;
+
+  /* bug found by Steve Kargl (2009-03-14) */
+  mpfr_init2 (x, 64);
+  mpfr_set_ui_2exp (x, 1, -16447, MPFR_RNDN);
+  mpfr_get_ld (x, MPFR_RNDN);  /* an assertion failed in init2.c:50 */
+
+  /* bug reported by Jakub Jelinek (2010-10-17)
+     https://gforge.inria.fr/tracker/?func=detail&aid=11300 */
+  mpfr_set_prec (x, MPFR_LDBL_MANT_DIG);
+  /* l = 0x1.23456789abcdef0123456789abcdp-914L; */
+  l = 8.215640181713713164092636634579e-276;
+  mpfr_set_ld (x, l, MPFR_RNDN);
+  m = mpfr_get_ld (x, MPFR_RNDN);
+  if (m != l)
+    {
+      printf ("Error in get_ld o set_ld for l=%Le\n", l);
+      printf ("Got m=%Le instead of l\n", m);
+      exit (1);
+    }
+
+  /* another similar test which failed with extended double precision and the
+     generic code for mpfr_set_ld */
+  /* l = 0x1.23456789abcdef0123456789abcdp-968L; */
+  l = 4.560596445887084662336528403703e-292;
+  mpfr_set_ld (x, l, MPFR_RNDN);
+  m = mpfr_get_ld (x, MPFR_RNDN);
+  if (m != l)
+    {
+      printf ("Error in get_ld o set_ld for l=%Le\n", l);
+      printf ("Got m=%Le instead of l\n", m);
+      exit (1);
+    }
+
+  mpfr_clear (x);
+}
+
+int
+main (int argc, char *argv[])
+{
+  long double d, e;
+  mpfr_t x;
+  int i;
+  mpfr_exp_t emax;
+#ifdef WITH_FPU_CONTROL
+  fpu_control_t cw;
+
+  if (argc > 1)
+    {
+      cw = strtol(argv[1], NULL, 0);
+      printf ("FPU control word: 0x%x\n", (unsigned int) cw);
+      _FPU_SETCW (cw);
+    }
+#endif
+
+  check_gcc33_bug ();
+  test_fixed_bugs ();
+
+  tests_start_mpfr ();
+  mpfr_test_init ();
+
+  mpfr_init2 (x, MPFR_LDBL_MANT_DIG);
+
+#if !defined(MPFR_ERRDIVZERO)
+  /* check NaN */
+  mpfr_set_nan (x);
+  d = mpfr_get_ld (x, MPFR_RNDN);
+  check_set_get (d, x);
+#endif
+
+  /* check +0.0 and -0.0 */
+  d = 0.0;
+  check_set_get (d, x);
+  d = DBL_NEG_ZERO;
+  check_set_get (d, x);
+
+  /* check that the sign of -0.0 is set */
+  mpfr_set_ld (x, DBL_NEG_ZERO, MPFR_RNDN);
+  if (MPFR_SIGN(x) > 0)
+    {
+      printf ("Error: sign of -0.0 is not set correctly\n");
+#if _GMP_IEEE_FLOATS
+      exit (1);
+      /* Non IEEE doesn't support negative zero yet */
+#endif
+    }
+
+#if !defined(MPFR_ERRDIVZERO)
+  /* check +Inf */
+  mpfr_set_inf (x, 1);
+  d = mpfr_get_ld (x, MPFR_RNDN);
+  check_set_get (d, x);
+
+  /* check -Inf */
+  mpfr_set_inf (x, -1);
+  d = mpfr_get_ld (x, MPFR_RNDN);
+  check_set_get (d, x);
+#endif
+
+  /* check the largest power of two */
+  d = 1.0; while (d < LDBL_MAX / 2.0) d += d;
+  check_set_get (d, x);
+  check_set_get (-d, x);
+
+  /* check largest long double */
+  d = LDBL_MAX;
+  check_set_get (d, x);
+  check_set_get (-d, x);
+
+  /* check the smallest power of two */
+  d = 1.0;
+  while ((e = d / 2.0) != (long double) 0.0 && e != d)
+    d = e;
+  check_set_get (d, x);
+  check_set_get (-d, x);
+
+  /* check largest 2^(2^k) that is representable as a long double */
+  d = (LDBL_MAX / 2) + (LDBL_MAX / 4 * LDBL_EPSILON);
+  check_set_get (d, x);
+
+  /* check that 2^i, 2^i+1 and 2^i-1 are correctly converted */
+  d = 1.0;
+  for (i = 1; i < MPFR_LDBL_MANT_DIG; i++)
+    {
+      d = 2.0 * d; /* d = 2^i */
+      check_set_get (d, x);
+      check_set_get (d + 1.0, x);
+      check_set_get (d - 1.0, x);
+    }
+
+  for (i = 0; i < 10000; i++)
+    {
+      mpfr_urandomb (x, RANDS);
+      d = mpfr_get_ld (x, MPFR_RNDN);
+      check_set_get (d, x);
+    }
+
+  /* check with reduced emax to exercise overflow */
+  emax = mpfr_get_emax ();
+  mpfr_set_prec (x, 2);
+  set_emax (1);
+  mpfr_set_ld (x, (long double) 2.0, MPFR_RNDN);
+  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+  for (d = (long double) 2.0, i = 0; i < 13; i++, d *= d);
+  /* now d = 2^8192 */
+  mpfr_set_ld (x, d, MPFR_RNDN);
+  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+  set_emax (emax);
+
+  mpfr_clear (x);
+
+  test_small ();
+
+  tests_end_mpfr ();
+
+  return 0;
+}