new version
[Chiptunes.git] / foo.c
diff --git a/foo.c b/foo.c
index d1b45f086e56abc8d281e40e6e77da6e9f021e55..c8eacfffa85f8c2a74a08e5298305192b0542924 100644 (file)
--- 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
@@ -36,9 +36,26 @@ int main(void) {
        u8 acc;
        //TODO: clear all vars/registers
        for (;;) {
-               acc = 0;
-               n = (i2<<2 | i1>>6);
-               s = (i3<<7 | i2>>1);
+               MOV     (n, i2)
+               LSL     (n)
+               LSL     (n)
+               #define tmp acc
+               MOV     (tmp, i1)
+               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
 
                //voice 1:
                LDI     (x, 1)
@@ -55,24 +72,38 @@ int main(void) {
                LSL     (tmp)
                LSL     (tmp)
                MOV     (t, i1)
-               t >>= 5;
+               SWAP    (t)
+               ANDI    (t, 0xf)
+               LSR     (t)
                OR      (t, tmp)
                #undef tmp
-               t = n ^ (o | t);
+               EOR     (t, n)
                LDI     (o, 10)
                RCALL   g();
                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)
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