From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c | 97 ++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c

(limited to 'gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c')

diff --git a/gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c b/gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c
new file mode 100644
index 0000000..55e6b89
--- /dev/null
+++ b/gmp-6.3.0/mpn/generic/toom_eval_dgr3_pm2.c
@@ -0,0 +1,97 @@
+/* mpn_toom_eval_dgr3_pm2 -- Evaluate a degree 3 polynomial in +2 and -2
+
+   Contributed to the GNU project by Niels Möller
+
+   THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE.  IT IS ONLY
+   SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS ALMOST
+   GUARANTEED THAT IT WILL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
+
+Copyright 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"
+
+/* Needs n+1 limbs of temporary storage. */
+int
+mpn_toom_eval_dgr3_pm2 (mp_ptr xp2, mp_ptr xm2,
+			mp_srcptr xp, mp_size_t n, mp_size_t x3n, mp_ptr tp)
+{
+  mp_limb_t cy;
+  int neg;
+
+  ASSERT (x3n > 0);
+  ASSERT (x3n <= n);
+
+  /* (x0 + 4 * x2) +/- (2 x1 + 8 x_3) */
+#if HAVE_NATIVE_mpn_addlsh_n || HAVE_NATIVE_mpn_addlsh2_n
+#if HAVE_NATIVE_mpn_addlsh2_n
+  xp2[n] = mpn_addlsh2_n (xp2, xp, xp + 2*n, n);
+
+  cy = mpn_addlsh2_n (tp, xp + n, xp + 3*n, x3n);
+#else /* HAVE_NATIVE_mpn_addlsh_n */
+  xp2[n] = mpn_addlsh_n (xp2, xp, xp + 2*n, n, 2);
+
+  cy = mpn_addlsh_n (tp, xp + n, xp + 3*n, x3n, 2);
+#endif
+  if (x3n < n)
+    cy = mpn_add_1 (tp + x3n, xp + n + x3n, n - x3n, cy);
+  tp[n] = cy;
+#else
+  cy = mpn_lshift (tp, xp + 2*n, n, 2);
+  xp2[n] = cy + mpn_add_n (xp2, tp, xp, n);
+
+  tp[x3n] = mpn_lshift (tp, xp + 3*n, x3n, 2);
+  if (x3n < n)
+    tp[n] = mpn_add (tp, xp + n, n, tp, x3n + 1);
+  else
+    tp[n] += mpn_add_n (tp, xp + n, tp, n);
+#endif
+  mpn_lshift (tp, tp, n+1, 1);
+
+  neg = (mpn_cmp (xp2, tp, n + 1) < 0) ? ~0 : 0;
+
+#if HAVE_NATIVE_mpn_add_n_sub_n
+  if (neg)
+    mpn_add_n_sub_n (xp2, xm2, tp, xp2, n + 1);
+  else
+    mpn_add_n_sub_n (xp2, xm2, xp2, tp, n + 1);
+#else
+  if (neg)
+    mpn_sub_n (xm2, tp, xp2, n + 1);
+  else
+    mpn_sub_n (xm2, xp2, tp, n + 1);
+
+  mpn_add_n (xp2, xp2, tp, n + 1);
+#endif
+
+  ASSERT (xp2[n] < 15);
+  ASSERT (xm2[n] < 10);
+
+  return neg;
+}
-- 
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