Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / generic / mul_1.c

diff --git a/gmp/mpn/generic/mul_1.c b/gmp/mpn/generic/mul_1.c
new file mode 100644 (file)
index 0000000..b8290cc
--- /dev/null
+++ b/gmp/mpn/generic/mul_1.c
@@ -0,0 +1,87 @@
+/* mpn_mul_1 -- Multiply a limb vector with a single limb and store the
+   product in a second limb vector.
+
+Copyright 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002 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"
+
+
+#if GMP_NAIL_BITS == 0
+
+mp_limb_t
+mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
+{
+  mp_limb_t ul, cl, hpl, lpl;
+
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_INCR_P (rp, up, n));
+
+  cl = 0;
+  do
+    {
+      ul = *up++;
+      umul_ppmm (hpl, lpl, ul, vl);
+
+      lpl += cl;
+      cl = (lpl < cl) + hpl;
+
+      *rp++ = lpl;
+    }
+  while (--n != 0);
+
+  return cl;
+}
+
+#endif
+
+#if GMP_NAIL_BITS >= 1
+
+mp_limb_t
+mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
+{
+  mp_limb_t shifted_vl, ul, lpl, hpl, prev_hpl, xw, cl, xl;
+
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_INCR_P (rp, up, n));
+  ASSERT_MPN (up, n);
+  ASSERT_LIMB (vl);
+
+  shifted_vl = vl << GMP_NAIL_BITS;
+  cl = 0;
+  prev_hpl = 0;
+  do
+    {
+      ul = *up++;
+
+      umul_ppmm (hpl, lpl, ul, shifted_vl);
+      lpl >>= GMP_NAIL_BITS;
+      xw = prev_hpl + lpl + cl;
+      cl = xw >> GMP_NUMB_BITS;
+      xl = xw & GMP_NUMB_MASK;
+      *rp++ = xl;
+      prev_hpl = hpl;
+    }
+  while (--n != 0);
+
+  return prev_hpl + cl;
+}
+
+#endif