From 9c0a347262ad5aa8564570ac672450b3e46c8570 Mon Sep 17 00:00:00 2001
From: Wojciech Kosior <kwojtus@protonmail.com>
Date: Sat, 5 Sep 2020 17:28:22 +0200
Subject: put procedures in tclasm.tcl in some order

---
 tclasm.tcl | 71 ++++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 44 insertions(+), 27 deletions(-)

(limited to 'tclasm.tcl')

diff --git a/tclasm.tcl b/tclasm.tcl
index ed4ed8d..17aa8aa 100644
--- a/tclasm.tcl
+++ b/tclasm.tcl
@@ -60,6 +60,10 @@ proc __to_binary {number length} {
     return $result
 }
 
+
+# _im and _with_im are needed to construct higher-level
+# multiinstructions, that use an immediate value
+
 proc _im {value} {
     puts 1[__to_binary $value 15]
 }
@@ -82,29 +86,7 @@ proc _with_im {command number} {
 }
 
 
-proc _const {value_part} {
-    puts 010100000[__to_binary $value_part 7]
-}
-
-proc const {value} {
-    _with_im _const $value
-}
-
-
-proc tee {} {
-    puts 0001000000000000
-}
-
-
-proc add {} {
-    puts 0011000000000000
-}
-
-
-proc sub {} {
-    puts 0011000000000001
-}
-
+# Load and store instructions, different variants */
 
 proc _store {address_part} {
     puts 011111100[__to_binary $address_part 7]
@@ -142,6 +124,23 @@ proc load+ {address} {
 }
 
 
+# Instructions, that do not change stack size
+
+proc halt {} {
+    puts 0000000000000000
+}
+
+
+proc nop {} {
+    puts 0000000000000001
+}
+
+
+proc swap {} {
+    puts 0000000000000010
+}
+
+
 proc _set_sp {address_part} {
     puts 010000000[__to_binary $address_part 7]
 }
@@ -151,11 +150,29 @@ proc set_sp {address} {
 }
 
 
-proc halt {} {
-    puts 0000000000000000
+# Instructions, that grow stack
+
+proc tee {} {
+    puts 0001000000000000
 }
 
 
-proc swap {} {
-    puts 0000000000000010
+proc _const {value_part} {
+    puts 010100000[__to_binary $value_part 7]
+}
+
+proc const {value} {
+    _with_im _const $value
+}
+
+
+# Instructions, that shrink stack
+
+proc add {} {
+    puts 0011000000000000
+}
+
+
+proc sub {} {
+    puts 0011000000000001
 }
-- 
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