[project @ 1996-01-08 20:28:12 by partain]

[ghc-hetmet.git] / ghc / runtime / gmp / mpz_cmp.c

diff --git a/ghc/runtime/gmp/mpz_cmp.c b/ghc/runtime/gmp/mpz_cmp.c
new file mode 100644 (file)
index 0000000..b76b494
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_cmp.c
@@ -0,0 +1,84 @@
+/* mpz_cmp(u,v) -- Compare U, V.  Return postive, zero, or negative
+   based on if U > V, U == V, or U < V.
+
+Copyright (C) 1991 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifdef BERKELEY_MP
+#include "mp.h"
+#endif
+#include "gmp.h"
+#include "gmp-impl.h"
+
+#ifndef BERKELEY_MP
+int
+#ifdef __STDC__
+mpz_cmp (const MP_INT *u, const MP_INT *v)
+#else
+mpz_cmp (u, v)
+     const MP_INT *u;
+     const MP_INT *v;
+#endif
+#else /* BERKELEY_MP */
+int
+#ifdef __STDC__
+mcmp (const MP_INT *u, const MP_INT *v)
+#else
+mcmp (u, v)
+     const MP_INT *u;
+     const MP_INT *v;
+#endif
+#endif /* BERKELEY_MP */
+{
+  mp_size usize = u->size;
+  mp_size vsize = v->size;
+  mp_size size;
+  mp_size i;
+  mp_limb a, b;
+  mp_srcptr up, vp;
+
+  if (usize != vsize)
+    return usize - vsize;
+
+  if (usize == 0)
+    return 0;
+
+  size = ABS (usize);
+
+  up = u->d;
+  vp = v->d;
+
+  i = size - 1;
+  do
+    {
+      a = up[i];
+      b = vp[i];
+      i--;
+      if (i < 0)
+       break;
+    }
+  while (a == b);
+
+  if (a == b)
+    return 0;
+
+  if ((a < b) == (usize < 0))
+    return 1;
+  else
+    return -1;
+}