Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/gen-fac.c b/third_party/gmp/gen-fac.c
new file mode 100644
index 0000000..93ebf7b
--- /dev/null
+++ b/third_party/gmp/gen-fac.c
@@ -0,0 +1,285 @@
+/* Generate data for combinatorics: fac_ui, bin_uiui, ...
+
+Copyright 2002, 2011-2016 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 <stdio.h>
+#include <stdlib.h>
+
+#include "bootstrap.c"
+
+int
+mpz_remove_twos (mpz_t x)
+{
+ mp_bitcnt_t r = mpz_scan1(x, 0);
+ mpz_tdiv_q_2exp (x, x, r);
+ return r;
+}
+
+/* returns 0 on success */
+int
+gen_consts (unsigned numb, unsigned limb)
+{
+ mpz_t x, mask, y, last;
+ unsigned long a, b;
+ unsigned long ofl, ofe;
+
+ printf ("/* This file is automatically generated by gen-fac.c */\n\n");
+ printf ("#if GMP_NUMB_BITS != %u\n", numb);
+ printf ("Error , error this data is for %u GMP_NUMB_BITS only\n", numb);
+ printf ("#endif\n");
+#if 0
+ printf ("#if GMP_LIMB_BITS != %u\n", limb);
+ printf ("Error , error this data is for %u GMP_LIMB_BITS only\n", limb);
+ printf ("#endif\n");
+#endif
+
+ printf
+ ("/* This table is 0!,1!,2!,3!,...,n! where n! has <= GMP_NUMB_BITS bits */\n");
+ printf
+ ("#define ONE_LIMB_FACTORIAL_TABLE CNST_LIMB(0x1),CNST_LIMB(0x1");
+ mpz_init_set_ui (x, 1);
+ mpz_init (last);
+ for (b = 2;; b++)
+ {
+ mpz_mul_ui (x, x, b); /* so b!=a */
+ if (mpz_sizeinbase (x, 2) > numb)
+ break;
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+
+ printf
+ ("\n/* This table is 0!,1!,2!/2,3!/2,...,n!/2^sn where n!/2^sn is an */\n");
+ printf
+ ("/* odd integer for each n, and n!/2^sn has <= GMP_NUMB_BITS bits */\n");
+ printf
+ ("#define ONE_LIMB_ODD_FACTORIAL_TABLE CNST_LIMB(0x1),CNST_LIMB(0x1),CNST_LIMB(0x1");
+ mpz_set_ui (x, 1);
+ for (b = 3;; b++)
+ {
+ for (a = b; (a & 1) == 0; a >>= 1);
+ mpz_swap (last, x);
+ mpz_mul_ui (x, last, a);
+ if (mpz_sizeinbase (x, 2) > numb)
+ break;
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+ printf
+ ("#define ODD_FACTORIAL_TABLE_MAX CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, last);
+ printf (")\n");
+
+ ofl = b - 1;
+ printf
+ ("#define ODD_FACTORIAL_TABLE_LIMIT (%lu)\n", ofl);
+ mpz_init (mask);
+ mpz_setbit (mask, numb);
+ mpz_sub_ui (mask, mask, 1);
+ printf
+ ("\n/* Previous table, continued, values modulo 2^GMP_NUMB_BITS */\n");
+ printf
+ ("#define ONE_LIMB_ODD_FACTORIAL_EXTTABLE CNST_LIMB(0x");
+ mpz_and (x, x, mask);
+ mpz_out_str (stdout, 16, x);
+ mpz_init (y);
+ mpz_bin_uiui (y, b, b/2);
+ b++;
+ for (;; b++)
+ {
+ for (a = b; (a & 1) == 0; a >>= 1);
+ if (a == b) {
+ mpz_divexact_ui (y, y, a/2+1);
+ mpz_mul_ui (y, y, a);
+ } else
+ mpz_mul_2exp (y, y, 1);
+ if (mpz_sizeinbase (y, 2) > numb)
+ break;
+ mpz_mul_ui (x, x, a);
+ mpz_and (x, x, mask);
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+ ofe = b - 1;
+ printf
+ ("#define ODD_FACTORIAL_EXTTABLE_LIMIT (%lu)\n", ofe);
+
+ printf
+ ("\n/* This table is 1!!,3!!,...,(2n+1)!! where (2n+1)!! has <= GMP_NUMB_BITS bits */\n");
+ printf
+ ("#define ONE_LIMB_ODD_DOUBLEFACTORIAL_TABLE CNST_LIMB(0x1");
+ mpz_set_ui (x, 1);
+ for (b = 3;; b+=2)
+ {
+ mpz_swap (last, x);
+ mpz_mul_ui (x, last, b);
+ if (mpz_sizeinbase (x, 2) > numb)
+ break;
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+ printf
+ ("#define ODD_DOUBLEFACTORIAL_TABLE_MAX CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, last);
+ printf (")\n");
+
+ printf
+ ("#define ODD_DOUBLEFACTORIAL_TABLE_LIMIT (%lu)\n", b - 2);
+
+ printf
+ ("\n/* This table x_1, x_2,... contains values s.t. x_n^n has <= GMP_NUMB_BITS bits */\n");
+ printf
+ ("#define NTH_ROOT_NUMB_MASK_TABLE (GMP_NUMB_MASK");
+ for (b = 2;b <= 8; b++)
+ {
+ mpz_root (x, mask, b);
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+
+ mpz_add_ui (mask, mask, 1);
+ printf
+ ("\n/* This table contains inverses of odd factorials, modulo 2^GMP_NUMB_BITS */\n");
+ printf
+ ("\n/* It begins with (2!/2)^-1=1 */\n");
+ printf
+ ("#define ONE_LIMB_ODD_FACTORIAL_INVERSES_TABLE CNST_LIMB(0x1");
+ mpz_set_ui (x, 1);
+ for (b = 3;b <= ofe - 2; b++)
+ {
+ for (a = b; (a & 1) == 0; a >>= 1);
+ mpz_mul_ui (x, x, a);
+ mpz_invert (y, x, mask);
+ printf ("),CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, y);
+ }
+ printf (")\n");
+
+ ofe = (ofe / 16 + 1) * 16;
+
+ printf
+ ("\n/* This table contains 2n-popc(2n) for small n */\n");
+ printf
+ ("\n/* It begins with 2-1=1 (n=1) */\n");
+ printf
+ ("#define TABLE_2N_MINUS_POPC_2N 1");
+ for (b = 4; b <= ofe; b += 2)
+ {
+ mpz_set_ui (x, b);
+ printf (",%lu",b - mpz_popcount (x));
+ }
+ printf ("\n");
+ printf
+ ("#define TABLE_LIMIT_2N_MINUS_POPC_2N %lu\n", ofe + 1);
+
+
+ ofl = (ofl + 1) / 2;
+ printf
+ ("#define ODD_CENTRAL_BINOMIAL_OFFSET (%lu)\n", ofl);
+ printf
+ ("\n/* This table contains binomial(2k,k)/2^t */\n");
+ printf
+ ("\n/* It begins with ODD_CENTRAL_BINOMIAL_TABLE_MIN */\n");
+ printf
+ ("#define ONE_LIMB_ODD_CENTRAL_BINOMIAL_TABLE ");
+ for (b = ofl;; b++)
+ {
+ mpz_bin_uiui (x, 2 * b, b);
+ mpz_remove_twos (x);
+ if (mpz_sizeinbase (x, 2) > numb)
+ break;
+ if (b != ofl)
+ printf ("),");
+ printf("CNST_LIMB(0x");
+ mpz_out_str (stdout, 16, x);
+ }
+ printf (")\n");
+
+ ofe = b - 1;
+ printf
+ ("#define ODD_CENTRAL_BINOMIAL_TABLE_LIMIT (%lu)\n", ofe);
+
+ printf
+ ("\n/* This table contains the inverses of elements in the previous table. */\n");
+ printf
+ ("#define ONE_LIMB_ODD_CENTRAL_BINOMIAL_INVERSE_TABLE CNST_LIMB(0x");
+ for (b = ofl; b <= ofe; b++)
+ {
+ mpz_bin_uiui (x, 2 * b, b);
+ mpz_remove_twos (x);
+ mpz_invert (x, x, mask);
+ mpz_out_str (stdout, 16, x);
+ if (b != ofe)
+ printf ("),CNST_LIMB(0x");
+ }
+ printf (")\n");
+
+ printf
+ ("\n/* This table contains the values t in the formula binomial(2k,k)/2^t */\n");
+ printf
+ ("#define CENTRAL_BINOMIAL_2FAC_TABLE ");
+ for (b = ofl; b <= ofe; b++)
+ {
+ mpz_bin_uiui (x, 2 * b, b);
+ printf ("%d", mpz_remove_twos (x));
+ if (b != ofe)
+ printf (",");
+ }
+ printf ("\n");
+
+ return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+ int nail_bits, limb_bits, numb_bits;
+
+ if (argc != 3)
+ {
+ fprintf (stderr, "Usage: gen-fac limbbits nailbits\n");
+ exit (1);
+ }
+ limb_bits = atoi (argv[1]);
+ nail_bits = atoi (argv[2]);
+ numb_bits = limb_bits - nail_bits;
+ if (limb_bits < 2 || nail_bits < 0 || numb_bits < 1)
+ {
+ fprintf (stderr, "Invalid limb/nail bits %d,%d\n", limb_bits,
+ nail_bits);
+ exit (1);
+ }
+ gen_consts (numb_bits, limb_bits);
+ return 0;
+}