X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=jars.git;a=blobdiff_plain;f=mars.scm;h=e97d2ba7a1efe90b601709981ed6cc2faafeb3fe;hp=a9ba7c54a274200769eb3d2292e2f8c224e3afca;hb=d7a887f10bfff04a5820d34615db3f2e5f1d37ea;hpb=47ac8e0ad3cc6cf75a637c1491059aaede68f4f4

diff --git a/mars.scm b/mars.scm
index a9ba7c5..e97d2ba 100644
--- a/mars.scm
+++ b/mars.scm
@@ -79,7 +79,9 @@
   ;;; Memory setup and addressing
   ;;
 
-  (define (make-core core-size initial-instr . set-functions)
+  (define INITIAL-INSTR (make-instr 'DAT 'F 'immediate 0 'immediate 0))
+
+  (define (make-core core-size . set-functions)
     (let ((core-vec (make-vector core-size '()))
           (names-vec (make-vector core-size '())))
       (define (norm-addr i)
@@ -105,7 +107,7 @@
         (print))
       (let loop ((i 0))
         (unless (>= i core-size)
-          (vector-set! core-vec i (initial-instr 'make-copy))
+          (vector-set! core-vec i (INITIAL-INSTR 'make-copy))
           (loop (+ i 1))))
       (lambda args
         (match args
@@ -205,24 +207,25 @@
 
   (define (dump-prog prog)
     (print (prog->string prog)))
-    
+
+
   ;;; Executive function
   ;;
 
   (define (run-mars core queues steps-left)
-    (cond
-     ((<= steps-left 0) queues)      ;Tie between remaining players
-     ((null? queues) queues)         ;Everyone's dead
-     (else
-      (let* ((queue (car queues))
-             (remaining-queues (cdr queues))
-             (ptrs (queue-ptrs queue))
-             (new-ptrs (execute-instr core (car ptrs) (queue-owner queue))))
-        (if (null? new-ptrs)
-            (run-mars core remaining-queues (- steps-left 1))
-            (begin
-              (queue-set-ptrs! queue (append (cdr ptrs) new-ptrs))
-              (run-mars core (append remaining-queues (list queue)) (- steps-left 1))))))))
+    (if (or (<= steps-left 0)
+            (null? queues)
+            (= (length queues) 1))
+        queues
+        (let* ((queue (car queues))
+               (remaining-queues (cdr queues))
+               (ptrs (queue-ptrs queue))
+               (new-ptrs (execute-instr core (car ptrs) (queue-owner queue))))
+          (if (null? new-ptrs)
+              (run-mars core remaining-queues (- steps-left 1))
+              (begin
+                (queue-set-ptrs! queue (append (cdr ptrs) new-ptrs))
+                (run-mars core (append remaining-queues (list queue)) (- steps-left 1)))))))
 
   (define (execute-instr core ptr name)
     ;; (print ptr "\t" (core ptr '->string) "\t(" name ")")