2005-12-13 Ulrich Drepper <drepper@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/stdlib/cmp.c b/stdlib/cmp.c
new file mode 100644
index 0000000000..e7661702b6
--- /dev/null
+++ b/stdlib/cmp.c
@@ -0,0 +1,56 @@
+/* mpn_cmp -- Compare two low-level natural-number integers.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 2.1 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; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <gmp.h>
+#include "gmp-impl.h"
+
+/* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
+   There are no restrictions on the relative sizes of
+   the two arguments.
+   Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2.  */
+
+int
+#if __STDC__
+mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size)
+#else
+mpn_cmp (op1_ptr, op2_ptr, size)
+     mp_srcptr op1_ptr;
+     mp_srcptr op2_ptr;
+     mp_size_t size;
+#endif
+{
+  mp_size_t i;
+  mp_limb_t op1_word, op2_word;
+
+  for (i = size - 1; i >= 0; i--)
+    {
+      op1_word = op1_ptr[i];
+      op2_word = op2_ptr[i];
+      if (op1_word != op2_word)
+	goto diff;
+    }
+  return 0;
+ diff:
+  /* This can *not* be simplified to
+	op2_word - op2_word
+     since that expression might give signed overflow.  */
+  return (op1_word > op2_word) ? 1 : -1;
+}