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/mpq/aors.c b/third_party/gmp/mpq/aors.c
new file mode 100644
index 0000000..e86af94
--- /dev/null
+++ b/third_party/gmp/mpq/aors.c
@@ -0,0 +1,112 @@
+/* mpq_add, mpq_sub -- add or subtract rational numbers.
+
+Copyright 1991, 1994-1997, 2000, 2001, 2004, 2005 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"
+
+
+static void __gmpq_aors (REGPARM_3_1 (mpq_ptr, mpq_srcptr, mpq_srcptr, void (*) (mpz_ptr, mpz_srcptr, mpz_srcptr))) REGPARM_ATTR (1);
+#define mpq_aors(w,x,y,fun) __gmpq_aors (REGPARM_3_1 (w, x, y, fun))
+
+REGPARM_ATTR (1) static void
+mpq_aors (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2,
+ void (*fun) (mpz_ptr, mpz_srcptr, mpz_srcptr))
+{
+ mpz_t gcd;
+ mpz_t tmp1, tmp2;
+ mp_size_t op1_num_size = ABSIZ(NUM(op1));
+ mp_size_t op1_den_size = SIZ(DEN(op1));
+ mp_size_t op2_num_size = ABSIZ(NUM(op2));
+ mp_size_t op2_den_size = SIZ(DEN(op2));
+ TMP_DECL;
+
+ TMP_MARK;
+ MPZ_TMP_INIT (gcd, MIN (op1_den_size, op2_den_size));
+ MPZ_TMP_INIT (tmp1, op1_num_size + op2_den_size);
+ MPZ_TMP_INIT (tmp2, op2_num_size + op1_den_size);
+
+ /* ROP might be identical to either operand, so don't store the
+ result there until we are finished with the input operands. We
+ dare to overwrite the numerator of ROP when we are finished
+ with the numerators of OP1 and OP2. */
+
+ mpz_gcd (gcd, DEN(op1), DEN(op2));
+ if (! MPZ_EQUAL_1_P (gcd))
+ {
+ mpz_t t;
+
+ MPZ_TMP_INIT (t, MAX (op1_num_size + op2_den_size,
+ op2_num_size + op1_den_size) + 2 - SIZ(gcd));
+
+ mpz_divexact_gcd (t, DEN(op2), gcd);
+ mpz_divexact_gcd (tmp2, DEN(op1), gcd);
+
+ mpz_mul (tmp1, NUM(op1), t);
+ mpz_mul (t, NUM(op2), tmp2);
+
+ (*fun) (t, tmp1, t);
+
+ mpz_gcd (gcd, t, gcd);
+ if (MPZ_EQUAL_1_P (gcd))
+ {
+ mpz_set (NUM(rop), t);
+ mpz_mul (DEN(rop), DEN(op2), tmp2);
+ }
+ else
+ {
+ mpz_divexact_gcd (NUM(rop), t, gcd);
+ mpz_divexact_gcd (tmp1, DEN(op2), gcd);
+ mpz_mul (DEN(rop), tmp1, tmp2);
+ }
+ }
+ else
+ {
+ /* The common divisor is 1. This is the case (for random input) with
+ probability 6/(pi**2), which is about 60.8%. */
+ mpz_mul (tmp1, NUM(op1), DEN(op2));
+ mpz_mul (tmp2, NUM(op2), DEN(op1));
+ (*fun) (NUM(rop), tmp1, tmp2);
+ mpz_mul (DEN(rop), DEN(op1), DEN(op2));
+ }
+ TMP_FREE;
+}
+
+
+void
+mpq_add (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2)
+{
+ mpq_aors (rop, op1, op2, mpz_add);
+}
+
+void
+mpq_sub (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2)
+{
+ mpq_aors (rop, op1, op2, mpz_sub);
+}