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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/generic/submul_1.c
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initial import
Diffstat (limited to 'sysdeps/generic/submul_1.c')
-rw-r--r--sysdeps/generic/submul_1.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/sysdeps/generic/submul_1.c b/sysdeps/generic/submul_1.c
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+/* __mpn_submul_1 -- multiply the S1_SIZE long limb vector pointed to by S1_PTR
+   by S2_LIMB, subtract the S1_SIZE least significant limbs of the product
+   from the limb vector pointed to by RES_PTR.  Return the most significant
+   limb of the product, adjusted for carry-out from the subtraction.
+
+Copyright (C) 1992, 1993, 1994 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+mp_limb
+__mpn_submul_1 (res_ptr, s1_ptr, s1_size, s2_limb)
+     register mp_ptr res_ptr;
+     register mp_srcptr s1_ptr;
+     mp_size_t s1_size;
+     register mp_limb s2_limb;
+{
+  register mp_limb cy_limb;
+  register mp_size_t j;
+  register mp_limb prod_high, prod_low;
+  register mp_limb x;
+
+  /* The loop counter and index J goes from -SIZE to -1.  This way
+     the loop becomes faster.  */
+  j = -s1_size;
+
+  /* Offset the base pointers to compensate for the negative indices.  */
+  res_ptr -= j;
+  s1_ptr -= j;
+
+  cy_limb = 0;
+  do
+    {
+      umul_ppmm (prod_high, prod_low, s1_ptr[j], s2_limb);
+
+      prod_low += cy_limb;
+      cy_limb = (prod_low < cy_limb) + prod_high;
+
+      x = res_ptr[j];
+      prod_low = x - prod_low;
+      cy_limb += (prod_low > x);
+      res_ptr[j] = prod_low;
+    }
+  while (++j != 0);
+
+  return cy_limb;
+}