X-Git-Url: https://git.gir.st/Chiptunes.git/blobdiff_plain/bc7680e361d3116a538bb6b9a5e4a658a9fdd71e..e4f7baf085f9080e41d12d4a5166e3fde0135da5:/foo.c

diff --git a/foo.c b/foo.c
index c752f28..c8eacff 100644
--- a/foo.c
+++ b/foo.c
@@ -24,7 +24,7 @@ void g(void) {
 	SUBI	(t, -8)
 	skip:
 	t = data[t];
-	t = ((i3<<24|i2<<16|i1<<8|i0)*t) >> o;
+	t = (((i1&0x1f)<<8|i0)*t) >> o;
 	AND	(t, x)
 	ANDI	(t, 3)
 	RET
@@ -41,10 +41,21 @@ int main(void) {
 		LSL	(n)
 		#define tmp acc
 		MOV	(tmp, i1)
-		tmp >>= 6;
-		n = (n | tmp);
+		SWAP	(tmp)
+		ANDI	(tmp, 0x0f)
+		LSR	(tmp)
+		LSR	(tmp)
+		OR	(n, tmp)
+		#undef tmp
+		MOV	(s, i3)
+		ROR	(s)
+		ROR	(s)
+		ANDI	(s, 0x80)
+		#define tmp acc
+		MOV	(tmp, i2)
+		LSR	(tmp)
+		OR	(s, tmp)
 		#undef tmp
-		s = (i3<<7 | i2>>1);
 
 		//voice 1:
 		LDI	(x, 1)
@@ -72,15 +83,27 @@ int main(void) {
 		ADD	(acc, t)
 
 		//voice 3:
-		x = s / 3;
-		t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
+		MOV	(x, s)
+		INC	(x)
+		#define tmp o
+		x = (x*0x55)>>8;
+		#undef tmp
+		t = ((i3&0x01)<<13 | i2<<5 | i1>>3) % 3;
+		ADD	(t, n)
 		LDI	(o, 10)
 		RCALL	g();
 		ADD	(acc, t)
 
 		//voice 4:
-		x = s / 5;
-		t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
+		MOV	(x, s)
+		INC	(x)
+		#define tmp o
+		x = (x*0x33)>>8;
+		#undef tmp
+		t = ((i3&0x01)<<14 | i2<<6 | i1>>2) % 3;
+		SUB	(t, n)
+		NEG	(t)
+		SUBI	(t, -8)
 		LDI	(o, 9)
 		RCALL	g();
 		ADD	(acc, t)