ALL: Add flint

external/flint-2.4.3/nmod_poly/evaluate_nmod.c

@@ -0,0 +1,62 @@
+/*=============================================================================
+
+    This file is part of FLINT.
+
+    FLINT is free software; you can redistribute it and/or modify
+    it under the terms of 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.
+
+    FLINT 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 a copy of the GNU General Public License
+    along with FLINT; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+=============================================================================*/
+/******************************************************************************
+
+    Copyright (C) 2010 William Hart
+
+******************************************************************************/
+
+#include <gmp.h>
+#include "flint.h"
+#include "ulong_extras.h"
+#include "nmod_poly.h"
+
+mp_limb_t
+_nmod_poly_evaluate_nmod(mp_srcptr poly, slong len, mp_limb_t c, nmod_t mod)
+{
+    slong m;
+    mp_limb_t val;
+
+    if (len == 0)
+        return 0;
+
+    if (len == 1 || c == 0)
+        return poly[0];
+
+    m = len - 1;
+    
+    val = poly[m];
+    m--;
+
+    for ( ; m >= 0; m--)
+    {
+        val = n_mulmod2_preinv(val, c, mod.n, mod.ninv);
+        val = n_addmod(val, poly[m], mod.n);
+    }
+
+    return val;
+}
+
+mp_limb_t
+nmod_poly_evaluate_nmod(const nmod_poly_t poly, mp_limb_t c)
+{
+    return _nmod_poly_evaluate_nmod(poly->coeffs, poly->length, c, poly->mod);
+}
+