X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/22a073c05a6237e8e4b3c4d9a761b04656209efe..22bab86c9df047bdd258283c6567821319ba7a6f:/mp.h

diff --git a/mp.h b/mp.h
index 12003d0..5b54513 100644
--- a/mp.h
+++ b/mp.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mp.h,v 1.8 2000/06/22 19:02:01 mdw Exp $
+ * $Id: mp.h,v 1.10 2000/10/08 12:03:16 mdw Exp $
  *
  * Simple multiprecision arithmetic
  *
@@ -30,6 +30,14 @@
 /*----- 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.
+ *
  * Revision 1.8  2000/06/22 19:02:01  mdw
  * Add new functions.
  *
@@ -420,13 +428,36 @@ extern void mp_scan(mpscan */*sc*/, const mp */*m*/);
   MPSCAN_INITX(_sc, _mm->v, _mm->vl);					\
 } while (0)
 
+/* --- @mp_rscan@ --- *
+ *
+ * Arguments:	@mpscan *sc@ = pointer to bitscanner block
+ *		@const mp *m@ = pointer to a multiprecision integer
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a reverse bitscanner on a multiprecision
+ *		integer.
+ */
+
+extern void mp_rscan(mpscan */*sc*/, const mp */*m*/);
+
+#define MP_RSCAN(sc, m) do {						\
+  const mp *_mm = (m);							\
+  mpscan *_sc = (sc);							\
+  MPSCAN_RINITX(_sc, _mm->v, _mm->vl);					\
+} while (0)
+
 /* --- Other bitscanning aliases --- */
 
 #define mp_step mpscan_step
 #define mp_bit mpscan_bit
+#define mp_rstep mpscan_rstep
+#define mp_rbit mpscan_rbit
 
 #define MP_STEP MPSCAN_STEP
 #define MP_BIT MPSCAN_BIT
+#define MP_RSTEP MPSCAN_RSTEP
+#define MP_RBIT MPSCAN_RBIT
 
 /*----- Loading and storing -----------------------------------------------*/
 
@@ -569,6 +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