diff --git a/vvp/codes.h b/vvp/codes.h
index 7f026b2ff..de558d541 100644
--- a/vvp/codes.h
+++ b/vvp/codes.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT)
-#ident "$Id: codes.h,v 1.14 2001/04/01 07:22:08 steve Exp $"
+#ident "$Id: codes.h,v 1.15 2001/04/01 22:25:33 steve Exp $"
 #endif
 
 
@@ -53,6 +53,7 @@ extern bool of_JOIN(vthread_t thr, vvp_code_t code);
 extern bool of_LOAD(vthread_t thr, vvp_code_t code);
 extern bool of_MOV(vthread_t thr, vvp_code_t code);
 extern bool of_NOOP(vthread_t thr, vvp_code_t code);
+extern bool of_NORR(vthread_t thr, vvp_code_t code);
 extern bool of_OR(vthread_t thr, vvp_code_t code);
 extern bool of_SET(vthread_t thr, vvp_code_t code);
 extern bool of_VPI_CALL(vthread_t thr, vvp_code_t code);
@@ -104,6 +105,9 @@ extern void codespace_dump(FILE*fd);
 
 /*
  * $Log: codes.h,v $
+ * Revision 1.15  2001/04/01 22:25:33  steve
+ *  Add the reduction nor instruction.
+ *
  * Revision 1.14  2001/04/01 07:22:08  steve
  *  Implement the less-then and %or instructions.
  *
diff --git a/vvp/compile.cc b/vvp/compile.cc
index f02f804d1..fa0da258c 100644
--- a/vvp/compile.cc
+++ b/vvp/compile.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT)
-#ident "$Id: compile.cc,v 1.27 2001/04/01 21:31:46 steve Exp $"
+#ident "$Id: compile.cc,v 1.28 2001/04/01 22:25:33 steve Exp $"
 #endif
 
 # include  "compile.h"
@@ -83,6 +83,7 @@ const static struct opcode_table_s opcode_table[] = {
       { "%load",   of_LOAD,   2,  {OA_BIT1,     OA_FUNC_PTR, OA_NONE} },
       { "%mov",    of_MOV,    3,  {OA_BIT1,     OA_BIT2,     OA_NUMBER} },
       { "%noop",   of_NOOP,   0,  {OA_NONE,     OA_NONE,     OA_NONE} },
+      { "%nor/r",  of_NORR,   3,  {OA_BIT1,     OA_BIT2,     OA_NUMBER} },
       { "%or",     of_OR,     3,  {OA_BIT1,     OA_BIT2,     OA_NUMBER} },
       { "%set",    of_SET,    2,  {OA_FUNC_PTR, OA_BIT1,     OA_NONE} },
       { "%wait",   of_WAIT,   1,  {OA_FUNC_PTR, OA_NONE,     OA_NONE} },
@@ -711,6 +712,9 @@ void compile_dump(FILE*fd)
 
 /*
  * $Log: compile.cc,v $
+ * Revision 1.28  2001/04/01 22:25:33  steve
+ *  Add the reduction nor instruction.
+ *
  * Revision 1.27  2001/04/01 21:31:46  steve
  *  Add the buf functor type.
  *
diff --git a/vvp/opcodes.txt b/vvp/opcodes.txt
index 91a81d276..640dc6081 100644
--- a/vvp/opcodes.txt
+++ b/vvp/opcodes.txt
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
  *
- *  $Id: opcodes.txt,v 1.10 2001/04/01 07:22:08 steve Exp $
+ *  $Id: opcodes.txt,v 1.11 2001/04/01 22:25:33 steve Exp $
  */
 
 
@@ -154,6 +154,12 @@ width and non-overlapping. The <dst> may not be 0-3, but if the <src>
 is one of the 4 constant bits, the effect is to replicate the value
 into the destination vector. Useful for filling a vector.
 
+* %nor/r <dst>, <src>, <wid>
+
+The %nor/r instruction is a reduction nor. That is, the <src> is a
+vector with width, but the result is a single bit. The <src> vector is
+not affected by the operation unless the <dst> bit is within the vector.
+
 * %or <dst>, <src>, <wid>
 
 Perform the bitwise or of the vectors.
diff --git a/vvp/vthread.cc b/vvp/vthread.cc
index 5ddd4b314..15481f9d1 100644
--- a/vvp/vthread.cc
+++ b/vvp/vthread.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT)
-#ident "$Id: vthread.cc,v 1.19 2001/04/01 07:22:08 steve Exp $"
+#ident "$Id: vthread.cc,v 1.20 2001/04/01 22:25:33 steve Exp $"
 #endif
 
 # include  "vthread.h"
@@ -418,6 +418,30 @@ bool of_NOOP(vthread_t thr, vvp_code_t cp)
       return true;
 }
 
+bool of_NORR(vthread_t thr, vvp_code_t cp)
+{
+      assert(cp->bit_idx1 >= 4);
+
+      unsigned lb = 0;
+      unsigned idx2 = cp->bit_idx2;
+
+      for (unsigned idx = 0 ;  idx < cp->number ;  idx += 1) {
+
+	    unsigned rb = thr_get_bit(thr, idx2);
+	    if (rb == 1) {
+		  lb = 1;
+		  break;
+	    }
+
+	    if (rb != 0)
+		  lb = 2;
+      }
+
+      thr_put_bit(thr, cp->bit_idx1, lb);
+
+      return true;
+}
+
 bool of_OR(vthread_t thr, vvp_code_t cp)
 {
       assert(cp->bit_idx1 >= 4);
@@ -480,6 +504,9 @@ bool of_WAIT(vthread_t thr, vvp_code_t cp)
 
 /*
  * $Log: vthread.cc,v $
+ * Revision 1.20  2001/04/01 22:25:33  steve
+ *  Add the reduction nor instruction.
+ *
  * Revision 1.19  2001/04/01 07:22:08  steve
  *  Implement the less-then and %or instructions.
  *