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/mpn/generic/sqr.c b/third_party/gmp/mpn/generic/sqr.c
new file mode 100644
index 0000000..74fbff0
--- /dev/null
+++ b/third_party/gmp/mpn/generic/sqr.c
@@ -0,0 +1,98 @@
+/* mpn_sqr -- square natural numbers.
+
+Copyright 1991, 1993, 1994, 1996-2003, 2005, 2008, 2009 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"
+
+void
+mpn_sqr (mp_ptr p, mp_srcptr a, mp_size_t n)
+{
+ ASSERT (n >= 1);
+ ASSERT (! MPN_OVERLAP_P (p, 2 * n, a, n));
+
+ if (BELOW_THRESHOLD (n, SQR_BASECASE_THRESHOLD))
+ { /* mul_basecase is faster than sqr_basecase on small sizes sometimes */
+ mpn_mul_basecase (p, a, n, a, n);
+ }
+ else if (BELOW_THRESHOLD (n, SQR_TOOM2_THRESHOLD))
+ {
+ mpn_sqr_basecase (p, a, n);
+ }
+ else if (BELOW_THRESHOLD (n, SQR_TOOM3_THRESHOLD))
+ {
+ /* Allocate workspace of fixed size on stack: fast! */
+ mp_limb_t ws[mpn_toom2_sqr_itch (SQR_TOOM3_THRESHOLD_LIMIT-1)];
+ ASSERT (SQR_TOOM3_THRESHOLD <= SQR_TOOM3_THRESHOLD_LIMIT);
+ mpn_toom2_sqr (p, a, n, ws);
+ }
+ else if (BELOW_THRESHOLD (n, SQR_TOOM4_THRESHOLD))
+ {
+ mp_ptr ws;
+ TMP_SDECL;
+ TMP_SMARK;
+ ws = TMP_SALLOC_LIMBS (mpn_toom3_sqr_itch (n));
+ mpn_toom3_sqr (p, a, n, ws);
+ TMP_SFREE;
+ }
+ else if (BELOW_THRESHOLD (n, SQR_TOOM6_THRESHOLD))
+ {
+ mp_ptr ws;
+ TMP_SDECL;
+ TMP_SMARK;
+ ws = TMP_SALLOC_LIMBS (mpn_toom4_sqr_itch (n));
+ mpn_toom4_sqr (p, a, n, ws);
+ TMP_SFREE;
+ }
+ else if (BELOW_THRESHOLD (n, SQR_TOOM8_THRESHOLD))
+ {
+ mp_ptr ws;
+ TMP_SDECL;
+ TMP_SMARK;
+ ws = TMP_SALLOC_LIMBS (mpn_toom6_sqr_itch (n));
+ mpn_toom6_sqr (p, a, n, ws);
+ TMP_SFREE;
+ }
+ else if (BELOW_THRESHOLD (n, SQR_FFT_THRESHOLD))
+ {
+ mp_ptr ws;
+ TMP_DECL;
+ TMP_MARK;
+ ws = TMP_ALLOC_LIMBS (mpn_toom8_sqr_itch (n));
+ mpn_toom8_sqr (p, a, n, ws);
+ TMP_FREE;
+ }
+ else
+ {
+ /* The current FFT code allocates its own space. That should probably
+ change. */
+ mpn_fft_mul (p, a, n, a, n);
+ }
+}