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/mpz/mul_i.h b/third_party/gmp/mpz/mul_i.h
new file mode 100644
index 0000000..65c9c2f
--- /dev/null
+++ b/third_party/gmp/mpz/mul_i.h
@@ -0,0 +1,106 @@
+/* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
+ MULTIPLICATOR times SMALL_MULTIPLICAND.
+
+Copyright 1991, 1993, 1994, 1996, 2000-2002, 2005, 2008, 2012 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"
+
+
+#ifdef OPERATION_mul_si
+#define FUNCTION mpz_mul_si
+#define MULTIPLICAND_UNSIGNED
+#define MULTIPLICAND_ABS(x) ABS_CAST(unsigned long, (x))
+#endif
+
+#ifdef OPERATION_mul_ui
+#define FUNCTION mpz_mul_ui
+#define MULTIPLICAND_UNSIGNED unsigned
+#define MULTIPLICAND_ABS(x) x
+#endif
+
+#ifndef FUNCTION
+Error, error, unrecognised OPERATION
+#endif
+
+
+void
+FUNCTION (mpz_ptr prod, mpz_srcptr mult,
+ MULTIPLICAND_UNSIGNED long int small_mult)
+{
+ mp_size_t size;
+ mp_size_t sign_product;
+ mp_limb_t sml;
+ mp_limb_t cy;
+ mp_ptr pp;
+
+ sign_product = SIZ(mult);
+ if (sign_product == 0 || small_mult == 0)
+ {
+ SIZ(prod) = 0;
+ return;
+ }
+
+ size = ABS (sign_product);
+
+ sml = MULTIPLICAND_ABS (small_mult);
+
+ if (sml <= GMP_NUMB_MAX)
+ {
+ pp = MPZ_REALLOC (prod, size + 1);
+ cy = mpn_mul_1 (pp, PTR(mult), size, sml);
+ pp[size] = cy;
+ size += cy != 0;
+ }
+#if GMP_NAIL_BITS != 0
+ else
+ {
+ /* Operand too large for the current nails size. Use temporary for
+ intermediate products, to allow prod and mult being identical. */
+ mp_ptr tp;
+ TMP_DECL;
+ TMP_MARK;
+
+ tp = TMP_ALLOC_LIMBS (size + 2);
+
+ /* Use, maybe, mpn_mul_2? */
+ cy = mpn_mul_1 (tp, PTR(mult), size, sml & GMP_NUMB_MASK);
+ tp[size] = cy;
+ cy = mpn_addmul_1 (tp + 1, PTR(mult), size, sml >> GMP_NUMB_BITS);
+ tp[size + 1] = cy;
+ size += 2;
+ MPN_NORMALIZE_NOT_ZERO (tp, size); /* too general, need to trim one or two limb */
+ pp = MPZ_NEWALLOC (prod, size);
+ MPN_COPY (pp, tp, size);
+ TMP_FREE;
+ }
+#endif
+
+ SIZ(prod) = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
+}