Revert "Remove gmp from AOS"
This reverts commit f37c97684f0910a3f241394549392f00145ab0f7.
We need gmp for SymEngine for symbolicmanipultion in C++
Change-Id: Ia13216d1715cf96944f7b4f422b7a799f921d4a4
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/third_party/gmp/rand/randmts.c b/third_party/gmp/rand/randmts.c
new file mode 100644
index 0000000..2c3fc09
--- /dev/null
+++ b/third_party/gmp/rand/randmts.c
@@ -0,0 +1,164 @@
+/* Mersenne Twister pseudo-random number generator functions.
+
+Copyright 2002, 2003, 2013, 2014 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 either:
+
+ * 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.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include "gmp-impl.h"
+#include "randmt.h"
+
+
+/* Calculate (b^e) mod (2^n-k) for e=1074888996, n=19937 and k=20023,
+ needed by the seeding function below. */
+static void
+mangle_seed (mpz_ptr r)
+{
+ mpz_t t, b;
+ unsigned long e = 0x40118124;
+ unsigned long bit = 0x20000000;
+
+ mpz_init2 (t, 19937L);
+ mpz_init_set (b, r);
+
+ do
+ {
+ mpz_mul (r, r, r);
+
+ reduce:
+ for (;;)
+ {
+ mpz_tdiv_q_2exp (t, r, 19937L);
+ if (SIZ (t) == 0)
+ break;
+ mpz_tdiv_r_2exp (r, r, 19937L);
+ mpz_addmul_ui (r, t, 20023L);
+ }
+
+ if ((e & bit) != 0)
+ {
+ e ^= bit;
+ mpz_mul (r, r, b);
+ goto reduce;
+ }
+
+ bit >>= 1;
+ }
+ while (bit != 0);
+
+ mpz_clear (t);
+ mpz_clear (b);
+}
+
+
+/* Seeding function. Uses powering modulo a non-Mersenne prime to obtain
+ a permutation of the input seed space. The modulus is 2^19937-20023,
+ which is probably prime. The power is 1074888996. In order to avoid
+ seeds 0 and 1 generating invalid or strange output, the input seed is
+ first manipulated as follows:
+
+ seed1 = seed mod (2^19937-20027) + 2
+
+ so that seed1 lies between 2 and 2^19937-20026 inclusive. Then the
+ powering is performed as follows:
+
+ seed2 = (seed1^1074888996) mod (2^19937-20023)
+
+ and then seed2 is used to bootstrap the buffer.
+
+ This method aims to give guarantees that:
+ a) seed2 will never be zero,
+ b) seed2 will very seldom have a very low population of ones in its
+ binary representation, and
+ c) every seed between 0 and 2^19937-20028 (inclusive) will yield a
+ different sequence.
+
+ CAVEATS:
+
+ The period of the seeding function is 2^19937-20027. This means that
+ with seeds 2^19937-20027, 2^19937-20026, ... the exact same sequences
+ are obtained as with seeds 0, 1, etc.; it also means that seed -1
+ produces the same sequence as seed 2^19937-20028, etc.
+ */
+
+static void
+randseed_mt (gmp_randstate_t rstate, mpz_srcptr seed)
+{
+ int i;
+ size_t cnt;
+
+ gmp_rand_mt_struct *p;
+ mpz_t mod; /* Modulus. */
+ mpz_t seed1; /* Intermediate result. */
+
+ p = (gmp_rand_mt_struct *) RNG_STATE (rstate);
+
+ mpz_init2 (mod, 19938L);
+ mpz_init2 (seed1, 19937L);
+
+ mpz_setbit (mod, 19937L);
+ mpz_sub_ui (mod, mod, 20027L);
+ mpz_mod (seed1, seed, mod); /* Reduce `seed' modulo `mod'. */
+ mpz_clear (mod);
+ mpz_add_ui (seed1, seed1, 2L); /* seed1 is now ready. */
+ mangle_seed (seed1); /* Perform the mangling by powering. */
+
+ /* Copy the last bit into bit 31 of mt[0] and clear it. */
+ p->mt[0] = (mpz_tstbit (seed1, 19936L) != 0) ? 0x80000000 : 0;
+ mpz_clrbit (seed1, 19936L);
+
+ /* Split seed1 into N-1 32-bit chunks. */
+ mpz_export (&p->mt[1], &cnt, -1, sizeof (p->mt[1]), 0,
+ 8 * sizeof (p->mt[1]) - 32, seed1);
+ mpz_clear (seed1);
+ cnt++;
+ ASSERT (cnt <= N);
+ while (cnt < N)
+ p->mt[cnt++] = 0;
+
+ /* Warm the generator up if necessary. */
+ if (WARM_UP != 0)
+ for (i = 0; i < WARM_UP / N; i++)
+ __gmp_mt_recalc_buffer (p->mt);
+
+ p->mti = WARM_UP % N;
+}
+
+
+static const gmp_randfnptr_t Mersenne_Twister_Generator = {
+ randseed_mt,
+ __gmp_randget_mt,
+ __gmp_randclear_mt,
+ __gmp_randiset_mt
+};
+
+/* Initialize MT-specific data. */
+void
+gmp_randinit_mt (gmp_randstate_t rstate)
+{
+ __gmp_randinit_mt_noseed (rstate);
+ RNG_FNPTR (rstate) = (void *) &Mersenne_Twister_Generator;
+}