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/mpn/generic/jacbase.c b/third_party/gmp/mpn/generic/jacbase.c
new file mode 100644
index 0000000..735ad7a
--- /dev/null
+++ b/third_party/gmp/mpn/generic/jacbase.c
@@ -0,0 +1,242 @@
+/* mpn_jacobi_base -- limb/limb Jacobi symbol with restricted arguments.
+
+ THIS INTERFACE IS PRELIMINARY AND MIGHT DISAPPEAR OR BE SUBJECT TO
+ INCOMPATIBLE CHANGES IN A FUTURE RELEASE OF GMP.
+
+Copyright 1999-2002, 2010 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 "longlong.h"
+
+
+/* Use the simple loop by default. The generic count_trailing_zeros is not
+ very fast, and the extra trickery of method 3 has proven to be less use
+ than might have been though. */
+#ifndef JACOBI_BASE_METHOD
+#define JACOBI_BASE_METHOD 2
+#endif
+
+
+/* Use count_trailing_zeros. */
+#if JACOBI_BASE_METHOD == 1
+#define PROCESS_TWOS_ANY \
+ { \
+ mp_limb_t twos; \
+ count_trailing_zeros (twos, a); \
+ result_bit1 ^= JACOBI_TWOS_U_BIT1 (twos, b); \
+ a >>= twos; \
+ }
+#define PROCESS_TWOS_EVEN PROCESS_TWOS_ANY
+#endif
+
+/* Use a simple loop. A disadvantage of this is that there's a branch on a
+ 50/50 chance of a 0 or 1 low bit. */
+#if JACOBI_BASE_METHOD == 2
+#define PROCESS_TWOS_EVEN \
+ { \
+ int two; \
+ two = JACOBI_TWO_U_BIT1 (b); \
+ do \
+ { \
+ a >>= 1; \
+ result_bit1 ^= two; \
+ ASSERT (a != 0); \
+ } \
+ while ((a & 1) == 0); \
+ }
+#define PROCESS_TWOS_ANY \
+ if ((a & 1) == 0) \
+ PROCESS_TWOS_EVEN;
+#endif
+
+/* Process one bit arithmetically, then a simple loop. This cuts the loop
+ condition down to a 25/75 chance, which should branch predict better.
+ The CPU will need a reasonable variable left shift. */
+#if JACOBI_BASE_METHOD == 3
+#define PROCESS_TWOS_EVEN \
+ { \
+ int two, mask, shift; \
+ \
+ two = JACOBI_TWO_U_BIT1 (b); \
+ mask = (~a & 2); \
+ a >>= 1; \
+ \
+ shift = (~a & 1); \
+ a >>= shift; \
+ result_bit1 ^= two ^ (two & mask); \
+ \
+ while ((a & 1) == 0) \
+ { \
+ a >>= 1; \
+ result_bit1 ^= two; \
+ ASSERT (a != 0); \
+ } \
+ }
+#define PROCESS_TWOS_ANY \
+ { \
+ int two, mask, shift; \
+ \
+ two = JACOBI_TWO_U_BIT1 (b); \
+ shift = (~a & 1); \
+ a >>= shift; \
+ \
+ mask = shift << 1; \
+ result_bit1 ^= (two & mask); \
+ \
+ while ((a & 1) == 0) \
+ { \
+ a >>= 1; \
+ result_bit1 ^= two; \
+ ASSERT (a != 0); \
+ } \
+ }
+#endif
+
+#if JACOBI_BASE_METHOD < 4
+/* Calculate the value of the Jacobi symbol (a/b) of two mp_limb_t's, but
+ with a restricted range of inputs accepted, namely b>1, b odd.
+
+ The initial result_bit1 is taken as a parameter for the convenience of
+ mpz_kronecker_ui() et al. The sign changes both here and in those
+ routines accumulate nicely in bit 1, see the JACOBI macros.
+
+ The return value here is the normal +1, 0, or -1. Note that +1 and -1
+ have bit 1 in the "BIT1" sense, which could be useful if the caller is
+ accumulating it into some extended calculation.
+
+ Duplicating the loop body to avoid the MP_LIMB_T_SWAP(a,b) would be
+ possible, but a couple of tests suggest it's not a significant speedup,
+ and may even be a slowdown, so what's here is good enough for now. */
+
+int
+mpn_jacobi_base (mp_limb_t a, mp_limb_t b, int result_bit1)
+{
+ ASSERT (b & 1); /* b odd */
+ ASSERT (b != 1);
+
+ if (a == 0)
+ return 0;
+
+ PROCESS_TWOS_ANY;
+ if (a == 1)
+ goto done;
+
+ if (a >= b)
+ goto a_gt_b;
+
+ for (;;)
+ {
+ result_bit1 ^= JACOBI_RECIP_UU_BIT1 (a, b);
+ MP_LIMB_T_SWAP (a, b);
+
+ a_gt_b:
+ do
+ {
+ /* working on (a/b), a,b odd, a>=b */
+ ASSERT (a & 1);
+ ASSERT (b & 1);
+ ASSERT (a >= b);
+
+ if ((a -= b) == 0)
+ return 0;
+
+ PROCESS_TWOS_EVEN;
+ if (a == 1)
+ goto done;
+ }
+ while (a >= b);
+ }
+
+ done:
+ return JACOBI_BIT1_TO_PN (result_bit1);
+}
+#endif
+
+#if JACOBI_BASE_METHOD == 4
+/* Computes (a/b) for odd b > 1 and any a. The initial bit is taken as a
+ * parameter. We have no need for the convention that the sign is in
+ * bit 1, internally we use bit 0. */
+
+/* FIXME: Could try table-based count_trailing_zeros. */
+int
+mpn_jacobi_base (mp_limb_t a, mp_limb_t b, int bit)
+{
+ int c;
+
+ ASSERT (b & 1);
+ ASSERT (b > 1);
+
+ if (a == 0)
+ /* This is the only line which depends on b > 1 */
+ return 0;
+
+ bit >>= 1;
+
+ /* Below, we represent a and b shifted right so that the least
+ significant one bit is implicit. */
+
+ b >>= 1;
+
+ count_trailing_zeros (c, a);
+ bit ^= c & (b ^ (b >> 1));
+
+ /* We may have c==GMP_LIMB_BITS-1, so we can't use a>>c+1. */
+ a >>= c;
+ a >>= 1;
+
+ do
+ {
+ mp_limb_t t = a - b;
+ mp_limb_t bgta = LIMB_HIGHBIT_TO_MASK (t);
+
+ if (t == 0)
+ return 0;
+
+ /* If b > a, invoke reciprocity */
+ bit ^= (bgta & a & b);
+
+ /* b <-- min (a, b) */
+ b += (bgta & t);
+
+ /* a <-- |a - b| */
+ a = (t ^ bgta) - bgta;
+
+ /* Number of trailing zeros is the same no matter if we look at
+ * t or a, but using t gives more parallelism. */
+ count_trailing_zeros (c, t);
+ c ++;
+ /* (2/b) = -1 if b = 3 or 5 mod 8 */
+ bit ^= c & (b ^ (b >> 1));
+ a >>= c;
+ }
+ while (b > 0);
+
+ return 1-2*(bit & 1);
+}
+#endif /* JACOBI_BASE_METHOD == 4 */