From 6033b21c49f3d5a4d0cb7356880e01af97c5c2ed Mon Sep 17 00:00:00 2001
From: Konarak <me@konarak.in>
Date: Tue, 7 Dec 2021 21:48:15 +0530
Subject: [PATCH] optimize Mult and Fill assembly

---
 projects/04/fill/Fill.asm | 33 +++++++++------------------------
 projects/04/mult/Mult.asm | 18 +++++-------------
 2 files changed, 14 insertions(+), 37 deletions(-)

diff --git a/projects/04/fill/Fill.asm b/projects/04/fill/Fill.asm
index 6cc2244..3c1bbd6 100644
--- a/projects/04/fill/Fill.asm
+++ b/projects/04/fill/Fill.asm
@@ -29,11 +29,6 @@ M=D
 @itr
 M=0
 
-// black if pix = -1
-// white if pix = 0
-@pix
-M=-1
-
 // loop declaration
 // D = reg - itr
 // if 0 jump to @END
@@ -72,33 +67,30 @@ M=M+1
 
 // clear the screen if no key pressed:
 // pix = 0
-// itr = 0
-// addr = 16384
 // back to loop declaration
     (CLEAR)
 @pix
 M=0
 
-@itr
-M=0
-
-@SCREEN
-D=A
-@addr
-M=D
-
 @LOOP
 0;JMP
 
 // paint the screen if no key pressed:
 // pix = -1
-// itr = 0
-// addr = 16384
 // back to loop declaration
     (PAINT)
 @pix
 M=-1
 
+@LOOP
+0;JMP
+
+// main feedback loop
+// itr = 0
+// addr = 16384
+// jump to @CLEAR if no key pressed
+// jump to @PAINT if any key pressed
+    (END)
 @itr
 M=0
 
@@ -107,13 +99,6 @@ D=A
 @addr
 M=D
 
-@LOOP
-0;JMP
-
-// main feedback loop
-// jump to @CLEAR if no key pressed
-// jump to @PAINT if any key pressed
-    (END)
 @KBD
 D=M
 @CLEAR
diff --git a/projects/04/mult/Mult.asm b/projects/04/mult/Mult.asm
index 484254e..ec31f1e 100644
--- a/projects/04/mult/Mult.asm
+++ b/projects/04/mult/Mult.asm
@@ -13,10 +13,9 @@
 
 // variable names are selfexplanatory
 // itr temporary register at RAM[16]
-// sum temporary register at RAM[17]
-@itr
+@R2
 M=0
-@sum
+@itr
 M=0
 
 // loop declaration
@@ -28,14 +27,14 @@ M=0
 D=M
 @R1
 D=D-M
-@STOP
+@END
 D;JEQ
 
-// sum = R0 + sum
+// R2 = R0 + R2
 // itr = itr + 1
 @R0
 D=M
-@sum
+@R2
 M=D+M
 @itr
 M=M+1
@@ -44,13 +43,6 @@ M=M+1
 @LOOP
 0;JMP
 
-// R2 = sum
-    (STOP)
-@sum
-D=M
-@R2
-M=D
-
 // loopy loop
     (END)
 @END