From 7c13f46198399dcb9c837b802833f821eda8f052 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Wed, 17 Nov 1999 18:04:43 +0000
Subject: [PATCH] Add two's complement support.  Fix a bug in MPX_UMLAN.

---
 mpx.h | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/mpx.h b/mpx.h
index 9429e91..88f547c 100644
--- a/mpx.h
+++ b/mpx.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mpx.h,v 1.3 1999/11/13 01:51:29 mdw Exp $
+ * $Id: mpx.h,v 1.4 1999/11/17 18:04:43 mdw Exp $
  *
  * Low level multiprecision arithmetic
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: mpx.h,v $
+ * Revision 1.4  1999/11/17 18:04:43  mdw
+ * Add two's complement support.  Fix a bug in MPX_UMLAN.
+ *
  * Revision 1.3  1999/11/13 01:51:29  mdw
  * Minor interface changes.  Should be stable now.
  *
@@ -282,6 +285,19 @@ extern void mpx_lsr(mpw */*dv*/, mpw */*dvl*/,
 
 /*----- Unsigned arithmetic -----------------------------------------------*/
 
+/* --- @mpx_2c@ --- *
+ *
+ * Arguments:	@mpw *dv, *dvl@ = destination vector
+ *		@const mpw *v, *vl@ = source vector
+ *
+ * Returns:	---
+ *
+ * Use:		Calculates the two's complement of @v@.
+ */
+
+extern void mpx_2c(mpw */*dv*/, mpw */*dvl*/,
+		   const mpw */*v*/, const mpw */*vl*/);
+
 /* --- @mpx_ucmp@ --- *
  *
  * Arguments:	@const mpw *av, *avl@ = first argument vector base and limit
@@ -444,18 +460,18 @@ extern void mpx_umul(mpw */*dv*/, mpw */*dvl*/,
 #define MPX_UMLAN(dv, dvl, av, avl, m) do {				\
   mpw *_dv = (dv), *_dvl = (dvl);					\
   const mpw *_av = (av), *_avl = (avl);					\
-  mpw _c = 0;								\
+  mpw _cc = 0;								\
   mpd _m = (m);								\
 									\
   while (_av < _avl) {							\
     mpd _x;								\
     if (_dv >= _dvl)							\
       break;								\
-    _x = (mpd)*_dv + (mpd)_m * (mpd)*_av++ + _c;			\
+    _x = (mpd)*_dv + (mpd)_m * (mpd)*_av++ + _cc;			\
     *_dv++ = MPW(_x);							\
-    _c = _x >> MPW_BITS;						\
+    _cc = _x >> MPW_BITS;						\
   }									\
-  MPX_UADDN(_dv, _dvl, _c);						\
+  MPX_UADDN(_dv, _dvl, _cc);						\
 } while (0)
 
 /* --- @mpx_usqr@ --- *
@@ -488,8 +504,7 @@ extern void mpx_usqr(mpw */*dv*/, mpw */*dvl*/,
  *		requiring the dividend to be in the result position but it
  *		does make some sense really.  The remainder must have
  *		headroom for at least two extra words.  The scratch space
- *		must be at least two words larger than twice the size of the
- *		divisor.
+ *		must be at least one word larger than the divisor.
  */
 
 extern void mpx_udiv(mpw */*qv*/, mpw */*qvl*/, mpw */*rv*/, mpw */*rvl*/,
-- 
2.11.0