Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mini-gmp/tests/t-double.c

@@ -0,0 +1,232 @@
+/*
+
+Copyright 2012, 2013, 2018 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 <limits.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <float.h>
+
+#include "testutils.h"
+
+#define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)
+
+mp_bitcnt_t
+mpz_mantissasizeinbits (const mpz_t z)
+{
+  return ! mpz_cmp_ui (z, 0) ? 0 :
+    mpz_sizeinbase (z, 2) - mpz_scan1 (z, 0);
+}
+
+#if defined(DBL_MANT_DIG) && FLT_RADIX == 2
+int
+mpz_get_d_exact_p (const mpz_t z)
+{
+  return mpz_mantissasizeinbits (z) <= DBL_MANT_DIG;
+}
+#define HAVE_EXACT_P 1
+#endif
+
+#define COUNT 10000
+
+void
+test_matissa (void)
+{
+  mpz_t x, y;
+  int i, c;
+
+  mpz_init (x);
+  mpz_init (y);
+
+  mini_urandomb (y, 4);
+  c = i = mpz_get_ui (y);
+
+  do {
+    double d;
+    int cmp;
+
+    mpz_setbit (x, c);
+    d = mpz_get_d (x);
+    mpz_set_d (y, d);
+    if (mpz_cmp_d (y, d) != 0)
+      {
+	fprintf (stderr, "mpz_cmp_d (y, d) failed:\n"
+		 "d = %.20g\n"
+		 "i = %i\n"
+		 "c = %i\n",
+		 d, i, c);
+	abort ();
+      }
+
+    cmp = mpz_cmp (x, y);
+
+#if defined(HAVE_EXACT_P)
+    if ((mpz_get_d_exact_p (x) != 0) != (cmp == 0))
+      {
+	fprintf (stderr, "Not all bits converted:\n"
+		 "d = %.20g\n"
+		 "i = %i\n"
+		 "c = %i\n",
+		 d, i, c);
+	abort ();
+      }
+#endif
+
+    if (cmp < 0)
+      {
+	fprintf (stderr, "mpz_get_d failed:\n"
+		 "d = %.20g\n"
+		 "i = %i\n"
+		 "c = %i\n",
+		 d, i, c);
+	abort ();
+      }
+    else if (cmp > 0)
+      {
+	if (mpz_cmp_d (x, d) <= 0)
+	  {
+	    fprintf (stderr, "mpz_cmp_d (x, d) failed:\n"
+		     "d = %.20g\n"
+		     "i = %i\n"
+		     "c = %i\n",
+		     d, i, c);
+	    abort ();
+	  }
+	break;
+      }
+    ++c;
+  } while (1);
+
+  mpz_clear (x);
+  mpz_clear (y);
+}
+
+#ifndef M_PI
+#define M_PI 3.141592653589793238462643383279502884
+#endif
+
+static const struct
+{
+  double d;
+  const char *s;
+} values[] = {
+  { 0.0, "0" },
+  { 0.3, "0" },
+  { -0.3, "0" },
+  { M_PI, "3" },
+  { M_PI*1e15, "b29430a256d21" },
+  { -M_PI*1e15, "-b29430a256d21" },
+  /* 17 * 2^{200} =
+     27317946752402834684213355569799764242877450894307478200123392 */
+  {0.2731794675240283468421335556979976424288e62,
+    "1100000000000000000000000000000000000000000000000000" },
+  { 0.0, NULL }
+};
+
+void
+testmain (int argc, char **argv)
+{
+  unsigned i;
+  mpz_t x;
+
+  for (i = 0; values[i].s; i++)
+    {
+      char *s;
+      mpz_init_set_d (x, values[i].d);
+      s = mpz_get_str (NULL, 16, x);
+      if (strcmp (s, values[i].s) != 0)
+	{
+	  fprintf (stderr, "mpz_set_d failed:\n"
+		   "d = %.20g\n"
+		   "s = %s\n"
+		   "r = %s\n",
+		   values[i].d, s, values[i].s);
+	  abort ();
+	}
+      testfree (s, strlen(s) + 1);
+      mpz_clear (x);
+    }
+
+  mpz_init (x);
+
+  for (i = 0; i < COUNT; i++)
+    {
+      /* Use volatile, to avoid extended precision in floating point
+	 registers, e.g., on m68k and 80387. */
+      volatile double d, f;
+      unsigned long m;
+      int e;
+
+      mini_rrandomb (x, GMP_LIMB_BITS);
+      m = mpz_get_ui (x);
+      mini_urandomb (x, 8);
+      e = mpz_get_ui (x) - 100;
+
+      d = ldexp ((double) m, e);
+      mpz_set_d (x, d);
+      f = mpz_get_d (x);
+      if (f != floor (d))
+	{
+	  fprintf (stderr, "mpz_set_d/mpz_get_d failed:\n");
+	  goto dumperror;
+	}
+      if ((f == d) ? (mpz_cmp_d (x, d) != 0) : (mpz_cmp_d (x, d) >= 0))
+	{
+	  fprintf (stderr, "mpz_cmp_d (x, d) failed:\n");
+	  goto dumperror;
+	}
+      f = d + 1.0;
+      if (f > d && ! (mpz_cmp_d (x, f) < 0))
+	{
+	  fprintf (stderr, "mpz_cmp_d (x, f) failed:\n");
+	  goto dumperror;
+	}
+
+      d = - d;
+
+      mpz_set_d (x, d);
+      f = mpz_get_d (x);
+      if (f != ceil (d))
+	{
+	  fprintf (stderr, "mpz_set_d/mpz_get_d failed:\n");
+	dumperror:
+	  dump ("x", x);
+	  fprintf (stderr, "m = %lx, e = %i\n", m, e);
+	  fprintf (stderr, "d = %.15g\n", d);
+	  fprintf (stderr, "f = %.15g\n", f);
+	  fprintf (stderr, "f - d = %.5g\n", f - d);
+	  abort ();
+	}
+      if ((f == d) ? (mpz_cmp_d (x, d) != 0) : (mpz_cmp_d (x, d) <= 0))
+	{
+	  fprintf (stderr, "mpz_cmp_d (x, d) failed:\n");
+	  goto dumperror;
+	}
+      f = d - 1.0;
+      if (f < d && ! (mpz_cmp_d (x, f) > 0))
+	{
+	  fprintf (stderr, "mpz_cmp_d (x, f) failed:\n");
+	  goto dumperror;
+	}
+    }
+
+  mpz_clear (x);
+  test_matissa();
+}