From 1764e9fd087cb3e465f8779cf3736a80b9b94a5e Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Mon, 22 Jun 2020 16:37:02 -0700
Subject: [PATCH] SCP: Rework REGister Sanity Checks to reject 0 bit wide
 register definitions

---
 scp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scp.c b/scp.c
index 36335644..301c576e 100644
--- a/scp.c
+++ b/scp.c
@@ -15396,6 +15396,10 @@ for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {
             Bad = TRUE;
             Mprintf (f, "%u bits at offset %u is wider than the maximum allowed width of %u bits\n", rptr->width, rptr->offset, (uint32)(8 * sizeof(t_value)));
             }
+        if (rptr->width == 0) {
+            Bad = TRUE;
+            Mprintf (f, "a 0 bit wide register is meaningless\n");
+            }
         if ((rptr->obj_size != 0) && (rptr->ele_size != 0) && (rptr->depth != 0) && (rptr->macro != NULL)) {
             if (rptr->flags & REG_UNIT) {
                 if (udptr == NULL) {