new version

diff --git a/foo.c b/foo.c
index 73574255ba416d442b06e912af100cac8e5cfe4d..1bc2f0476c94e1b3a9fd183c1583d11946bcabdf 100644 (file)
--- a/foo.c
+++ b/foo.c
@@ -68,10 +68,35 @@ void g(void) {
        SUBI    (t, -8)
        skip:
        //TODO: directly load address to mul_* routine and jump to it?
+       ;static void* mul_jmptable[] = {   
+               &&mul_84, &&mul_9d, &&mul_b0, &&mul_69, &&mul_9d, &&mul_84, &&mul_69, &&mul_58,
+               &&mul_75, &&mul_8c, &&mul_b0, &&mul_69, &&mul_8c, &&mul_75, &&mul_69, &&mul_58
+       };
+       void *t_;
+       t_ = mul_jmptable[t];
+       #define a1 x
+       #define a2 _
+       #define a0 t
+       CLR     (a2)
+       CLR     (a1)
+       goto *t_; //GNU extension simulates indirect jump
+       /*
+         LDI  Xlo==x, data_lo
+         ADD  Xlo, t
+         ADD  Xlo, t  ; 16 bit value; advance by 2*u8
+         LDI  Xhi==t, data_hi <--this won't work, need t afterwards
+         ADC  Xhi, zero
+         LD   Zlo, X
+         SUBI Xlo, -1
+         ADC  Xhi, zero
+         LD   Zhi, X
+         IJMP Z
+       */
+#if 0
        t = data[t];
-       /*MOV X_hi==x, data_hi
-         MOV X_lo==t, data_lo
-         ADD X_lo, t
+       /*MOV X_hi==x, data_hi _
+         MOV X_lo==t, data_lo  \_ this won't
+         ADD X_lo, t          _/  work! XXX
          ADC X_hi, zero
          LD  t, X         */
        #define a1 x
@@ -80,6 +105,7 @@ void g(void) {
        // start MUL
        CLR     (a2)
        CLR     (a1)
+#endif
 
        //sorted by ocurrence, then longest cycle count first
        CPI     (t, 0x69)