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Diffstat (limited to 'ghc/runtime/gmp/mpz_cmp.c')
-rw-r--r--ghc/runtime/gmp/mpz_cmp.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/ghc/runtime/gmp/mpz_cmp.c b/ghc/runtime/gmp/mpz_cmp.c
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+++ b/ghc/runtime/gmp/mpz_cmp.c
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+/* 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;
+}