Provide @mp_eq@ and @MP_EQ@ for rapidly testing equality of two

[u/mdw/catacomb] / mp.h

diff --git a/mp.h b/mp.h
index 5bc465d..5b54513 100644 (file)
--- a/mp.h
+++ b/mp.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mp.h,v 1.9 2000/07/29 17:03:31 mdw Exp $
+ * $Id: mp.h,v 1.10 2000/10/08 12:03:16 mdw Exp $
  *
  * Simple multiprecision arithmetic
  *
@@ -30,6 +30,10 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: mp.h,v $
+ * Revision 1.10  2000/10/08 12:03:16  mdw
+ * Provide @mp_eq@ and @MP_EQ@ for rapidly testing equality of two
+ * integers.
+ *
  * Revision 1.9  2000/07/29 17:03:31  mdw
  * Add support for left-to-right bitscanning, for use in modular
  * exponentiation.
@@ -596,6 +600,19 @@ extern mp *mp_lsl(mp */*d*/, mp */*a*/, size_t /*n*/);
 
 extern mp *mp_lsr(mp */*d*/, mp */*a*/, size_t /*n*/);
 
+/* --- @mp_eq@ --- *
+ *
+ * Arguments:  @const mp *a, *b@ = two numbers
+ *
+ * Returns:    Nonzero if the numbers are equal.
+ */
+
+extern int mp_eq(const mp */*a*/, const mp */*b*/);
+
+#define MP_EQ(a, b)                                                    \
+  ((((a)->f ^ (b)->f) & MP_NEG) == 0 &&                                        \
+   mpx_ueq((a)->v, (a)->vl, (b)->v, (b)->vl))
+
 /* --- @mp_cmp@ --- *
  *
  * Arguments:  @const mp *a, *b@ = two numbers