add uxn sierpinski example

examples/uxnSierpinski/header.tal

@@ -0,0 +1,3 @@
+|00 @System &vector $2 &pad $6 &r $2 &g $2 &b $2
+|10 @Console &vector $2 &read $1 &pad $5 &write $1 &error $1
+|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1

examples/uxnSierpinski/main.cal

@@ -0,0 +1,68 @@
+# Compile with:
+# cac main.cal -b uxn -i ../../std -h header.tal -o sierpinski.rom
+
+include "cores/select.cal"
+
+func init_palette begin asm
+	# 0f 0f 3f 0f 0e 0f
+	"#0f0f .System/r DEO2"
+	"#3f0f .System/g DEO2"
+	"#0e0f .System/b DEO2"
+end end
+
+func set_screen_size begin asm # width, height
+	".Screen/height DEO2"
+	".Screen/width DEO2"
+end end
+
+func get_screen_size begin asm # -> width, height
+	".Screen/width DEI2"
+	".Screen/height DEI2"
+end end
+
+inline draw_pixel begin asm # colour, x, y
+	".Screen/y DEO2"
+	".Screen/x DEO2"
+	"NIP .Screen/pixel DEO"
+end end
+
+func sierpinski begin
+	let cell n
+	let cell x
+	let cell y
+	let cell pad
+	let cell rowStart
+	2 * n !
+
+	0 y !
+	n @ 2 / pad !
+
+	n @ 2 / n @ 2 / set_screen_size
+
+	while y @ n @ 2 / < do
+		0 x !
+
+		while x @ pad @ < do
+			x @ 1 + x !
+		end
+
+		x @ 2 / rowStart !
+		0 x !
+
+		while x @ n @ < do
+			if x @ n @ y @ 1 + - and then
+
+			else
+				1 x @ rowStart @ + y @ draw_pixel
+			end
+
+			x @ 1 + x !
+		end
+
+		y @ 1 + y !
+		pad @ 1 - pad !
+	end
+end
+
+init_palette
+512 sierpinski

source/app.d

@@ -301,10 +301,12 @@ int main(string[] args) {
 	catch (PreprocessorError) {
 		return 1;
 	}
-
-	/*auto codeRemover = new CodeRemover();
-	codeRemover.Run(nodes);
-	nodes = codeRemover.res;*/
+
+	if (optimise) {
+		auto codeRemover = new CodeRemover();
+		codeRemover.Run(nodes);
+		nodes = codeRemover.res;
+	}
 
 	compiler.versions = preproc.versions;
 

source/backends/uxn.d

@@ -115,7 +115,6 @@ class BackendUXN : CompilerBackend {
 	override long MaxInt() => 0xFFFF;
 
 	override string DefaultHeader() => "
-		|0 @vsp $2 @arraySrc $2 @arrayDest $2
 		|10 @Console &vector $2 &read $1 &pad $5 &write $1 &error $1
 	";
 
@@ -153,7 +152,6 @@ class BackendUXN : CompilerBackend {
 
 	override void Init() {
 		output ~= "|0 @vsp $2 @arraySrc $2 @arrayDest $2\n";
-		output ~= "|10 @Console &vector $2 &read $1 &pad $5 &write $1 &error $1\n";
 		output ~= "|100\n";
 		output ~= "@on-reset\n";
 		output ~= "    #ffff .vsp STZ2\n";