Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/tests/mpz/t-powm.c

@@ -0,0 +1,263 @@
+/* Test mpz_powm, mpz_mul, mpz_mod, mpz_mod_ui, mpz_div_ui.
+
+Copyright 1991, 1993, 1994, 1996, 1999-2001, 2009, 2012, 2019 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 <string.h>
+
+#include "gmp-impl.h"
+#include "tests.h"
+
+void debug_mp (mpz_t, int);
+
+#define SIZEM 13
+
+/* Check that all sizes up to just above MUL_TOOM22_THRESHOLD have been tested
+   a few times.  FIXME: If SIZEM is set too low, this will never happen.  */
+int
+allsizes_seen (unsigned int *allsizes)
+{
+  mp_size_t i;
+
+  for (i = 1; i < MUL_TOOM22_THRESHOLD + 4; i++)
+    if (allsizes[i] < 4)
+      return 0;
+  return 1;
+}
+
+void
+small_2pow (unsigned long reps)
+{
+  mpz_t du, exp, mod;
+  mpz_t r1;
+  unsigned long m, e, r;
+  mp_limb_t b0 = 2;
+
+  mpz_roinit_n (du, &b0, 1);
+  mpz_init (exp);
+  mpz_init (mod);
+  mpz_init (r1);
+
+  for (m = 3; m * m < reps; m += 2)
+    {
+      mpz_set_ui (mod, m);
+      r = 1;
+      for (e = 0; e < m; e += 1)
+	{
+	  mpz_set_ui (exp, e);
+	  mpz_powm (r1, du, exp, mod);
+	  MPZ_CHECK_FORMAT (r1);
+	  if (mpz_cmp_ui (r1, r) != 0)
+	    {
+	      fprintf (stderr, "\nIncorrect result for operands:\n");
+	      debug_mp (du, -16);
+	      debug_mp (exp, -16);
+	      debug_mp (mod, -16);
+	      fprintf (stderr, "mpz_powm result:\n");
+	      debug_mp (r1, -16);
+	      fprintf (stderr, "Should be 2 ^ 0x%lx = 0x%lx (mod 0x%lx)\n", e, r, m);
+	      abort ();
+	    }
+	  if (r > (m >> 1))
+	    r = (r << 1) - m;
+	  else
+	    r = r << 1;
+	}
+    }
+
+  mpz_clear (exp);
+  mpz_clear (mod);
+  mpz_clear (r1);
+}
+
+int
+main (int argc, char **argv)
+{
+  mpz_t base, exp, mod;
+  mpz_t r1, r2, t1, exp2, base2;
+  mp_size_t base_size, exp_size, mod_size;
+  int i;
+  int reps = 1000;
+  gmp_randstate_ptr rands;
+  mpz_t bs;
+  unsigned long bsi, size_range;
+  unsigned int allsizes[1 << (SIZEM + 2 - 1)];
+
+  tests_start ();
+  TESTS_REPS (reps, argv, argc);
+
+  small_2pow ((unsigned int) reps);
+  rands = RANDS;
+
+  mpz_init (bs);
+
+  mpz_init (base);
+  mpz_init (exp);
+  mpz_init (mod);
+  mpz_init (r1);
+  mpz_init (r2);
+  mpz_init (t1);
+  mpz_init (exp2);
+  mpz_init (base2);
+
+  memset (allsizes, 0, (1 << (SIZEM + 2 - 1)) * sizeof (int));
+
+  reps += reps >> 3;
+  for (i = 0; i < reps || ! allsizes_seen (allsizes); i++)
+    {
+      mpz_urandomb (bs, rands, 32);
+      size_range = mpz_get_ui (bs) % SIZEM + 2;
+
+      if ((i & 7) == 0)
+	{
+	  mpz_set_ui (exp, 1);
+
+	  do  /* Loop until mathematically well-defined.  */
+	    {
+	      mpz_urandomb (bs, rands, size_range / 2 + 2);
+	      base_size = mpz_get_ui (bs);
+	      mpz_rrandomb (base, rands, base_size);
+	    }
+	  while (mpz_cmp_ui (base, 0) == 0);
+
+	  mpz_urandomb (bs, rands, size_range / 2);
+	  mod_size = mpz_get_ui (bs);
+	  mod_size = MIN (mod_size, base_size);
+	  mpz_rrandomb (mod, rands, mod_size);
+
+	  mpz_urandomb (bs, rands, size_range);
+	  mod_size = mpz_get_ui (bs) + base_size + 2;
+	  if ((i & 8) == 0)
+	    mod_size += GMP_NUMB_BITS - mod_size % GMP_NUMB_BITS;
+	  mpz_setbit (mod, mod_size);
+
+	  mpz_sub (base, base, mod);
+	}
+      else
+	{
+      do  /* Loop until mathematically well-defined.  */
+	{
+	  if ((i & 7) == 4)
+	    mpz_set_ui (base, 2);
+	  else
+	    {
+	      mpz_urandomb (bs, rands, size_range);
+	      base_size = mpz_get_ui (bs);
+	      mpz_rrandomb (base, rands, base_size);
+	    }
+
+	  mpz_urandomb (bs, rands, 7L);
+	  exp_size = mpz_get_ui (bs);
+	  mpz_rrandomb (exp, rands, exp_size);
+	}
+      while (mpz_cmp_ui (base, 0) == 0 && mpz_cmp_ui (exp, 0) == 0);
+
+      do
+        {
+	  mpz_urandomb (bs, rands, size_range);
+	  mod_size = mpz_get_ui (bs);
+	  mpz_rrandomb (mod, rands, mod_size);
+	}
+      while (mpz_cmp_ui (mod, 0) == 0);
+
+      allsizes[SIZ(mod)] += 1;
+
+      mpz_urandomb (bs, rands, 2);
+      bsi = mpz_get_ui (bs);
+      if ((bsi & 1) != 0)
+	mpz_neg (base, base);
+
+      /* printf ("%ld %ld %ld\n", SIZ (base), SIZ (exp), SIZ (mod)); */
+	}
+
+      mpz_set_ui (r2, 1);
+      mpz_mod (base2, base, mod);
+      mpz_set (exp2, exp);
+      mpz_mod (r2, r2, mod);
+
+      for (;;)
+	{
+	  if (mpz_tstbit (exp2, 0))
+	    {
+	      mpz_mul (r2, r2, base2);
+	      mpz_mod (r2, r2, mod);
+	    }
+	  if  (mpz_cmp_ui (exp2, 1) <= 0)
+	    break;
+	  mpz_mul (base2, base2, base2);
+	  mpz_mod (base2, base2, mod);
+	  mpz_tdiv_q_2exp (exp2, exp2, 1);
+	}
+
+      mpz_powm (r1, base, exp, mod);
+      MPZ_CHECK_FORMAT (r1);
+
+      if (mpz_cmp (r1, r2) != 0)
+	{
+	  fprintf (stderr, "\nIncorrect results in test %d for operands:\n", i);
+	  debug_mp (base, -16);
+	  debug_mp (exp, -16);
+	  debug_mp (mod, -16);
+	  fprintf (stderr, "mpz_powm result:\n");
+	  debug_mp (r1, -16);
+	  fprintf (stderr, "reference result:\n");
+	  debug_mp (r2, -16);
+	  abort ();
+	}
+
+      if (mpz_tdiv_ui (mod, 2) == 0)
+	continue;
+
+      mpz_powm_sec (r1, base, exp, mod);
+      MPZ_CHECK_FORMAT (r1);
+
+      if (mpz_cmp (r1, r2) != 0)
+	{
+	  fprintf (stderr, "\nIncorrect results in test %d for operands:\n", i);
+	  debug_mp (base, -16);
+	  debug_mp (exp, -16);
+	  debug_mp (mod, -16);
+	  fprintf (stderr, "mpz_powm_sec result:\n");
+	  debug_mp (r1, -16);
+	  fprintf (stderr, "reference result:\n");
+	  debug_mp (r2, -16);
+	  abort ();
+	}
+    }
+
+  mpz_clear (bs);
+  mpz_clear (base);
+  mpz_clear (exp);
+  mpz_clear (mod);
+  mpz_clear (r1);
+  mpz_clear (r2);
+  mpz_clear (t1);
+  mpz_clear (exp2);
+  mpz_clear (base2);
+
+  tests_end ();
+  exit (0);
+}
+
+void
+debug_mp (mpz_t x, int base)
+{
+  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
+}