Moved mpn_div_qr_2u_pi1 to a separate file.

1 files changed, 66 insertions, 0 deletions

diff --git a/mpn/generic/div_qr_2u_pi1.c b/mpn/generic/div_qr_2u_pi1.c
new file mode 100644
index 000000000..1abac7b24
--- /dev/null
+++ b/mpn/generic/div_qr_2u_pi1.c
@@ -0,0 +1,66 @@
+/* mpn_div_qr_2u_pi1
+
+   Contributed to the GNU project by Niels Möller
+
+   THIS FILE CONTAINS INTERNAL FUNCTIONS WITH MUTABLE INTERFACES.  IT IS
+   ONLY SAFE TO REACH THEM THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS
+   ALMOST GUARANTEED THAT THEY'LL CHANGE OR DISAPPEAR IN A FUTURE GNU MP
+   RELEASE.
+
+
+Copyright 2011 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 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.
+
+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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+
+/* 3/2 loop, for unnormalized divisor */
+mp_limb_t
+mpn_div_qr_2u_pi1 (mp_ptr qp, mp_ptr rp, mp_srcptr np, mp_size_t nn,
+		   mp_limb_t d1, mp_limb_t d0, int shift, mp_limb_t di)
+{
+  mp_limb_t qh;
+  mp_limb_t r2, r1, r0;
+  mp_size_t i;
+
+  ASSERT (nn >= 2);
+  ASSERT (!(d1 & GMP_NUMB_HIGHBIT));
+  ASSERT (shift > 0);
+
+  r2 = np[nn-1] >> (GMP_LIMB_BITS - shift);
+  r1 = (np[nn-1] << shift) | (np[nn-2] >> (GMP_LIMB_BITS - shift));
+  r0 = np[nn-2] << shift;
+
+  udiv_qr_3by2 (qh, r2, r1, r2, r1, r0, d1, d0, di);
+
+  for (i = nn - 2 - 1; i >= 0; i--)
+    {
+      mp_limb_t q;
+      r0 = np[i];
+      r1 |= r0 >> (GMP_LIMB_BITS - shift);
+      r0 <<= shift;
+      udiv_qr_3by2 (q, r2, r1, r2, r1, r0, d1, d0, di);
+      qp[i] = q;
+    }
+
+  rp[0] = (r1 >> shift) | (r2 << (GMP_LIMB_BITS - shift));
+  rp[1] = r2 >> shift;
+
+  return qh;
+}