From 5ce0eec69175339483fb23ee9ba6e888629b50bb Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Fri, 14 Sep 2018 03:48:52 -0400
Subject: [PATCH 1/2] Save 2 bytes each in push and pop stack

`ADD` supports a direct operand, so why not use it?
---
 c8c.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/c8c.c b/c8c.c
index 6da9b8c..17d8887 100644
--- a/c8c.c
+++ b/c8c.c
@@ -542,15 +542,13 @@ static void gfpush()
 {
     print("\tLD F,VE");
     print("\tLD [I],VE");
-    print("\tLD VF,0x03");
-    print("\tADD VE,VF");
+    print("\tADD VE,0x03");
 }
 
 // Generate frame pop.
 static void gfpop()
 {
-    print("\tLD VF,0x03");
-    print("\tSUB VE,VF");
+    print("\tSUB VE,0x03");
     print("\tLD VF,V%1X", v);
     print("\tLD F,VE");
     print("\tLD VE,[I]");

From f2bd7a8b396281cf6bdfbefe45be707a1fe72bfc Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Mon, 17 Sep 2018 04:55:49 -0400
Subject: [PATCH 2/2] Use ADD instead of SUB

SUB doesn't allow direct operands, but ADD does.
---
 c8c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/c8c.c b/c8c.c
index 17d8887..c35d340 100644
--- a/c8c.c
+++ b/c8c.c
@@ -548,7 +548,7 @@ static void gfpush()
 // Generate frame pop.
 static void gfpop()
 {
-    print("\tSUB VE,0x03");
+    print("\tADD VE,0xFD ; SUB VE, 0x03");
     print("\tLD VF,V%1X", v);
     print("\tLD F,VE");
     print("\tLD VE,[I]");