more intelligent decoding

Imanol-Mikel Barba Sabariego
1 parent 746fe14d
Showing 1 changed file with 11 additions and 62 deletions
cpu.c
@@ -245,88 +245,37 @@ void decode_instruction(uint16_t opcode, uint16_t *arg1, uint16_t *arg2, uint16_
     switch(opcode)
     {
         case HALT:
-            break;
-        case MOV:
-            *arg1 = fetch();
-            *arg2 = fetch();
+        case RET:
+        case NOP:
             break;
         case PUSH:
-            *arg1 = fetch();
-            break;
         case POP:
-            *arg1 = fetch();
-            break;
-        case TEQ:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
-        case TGT:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
         case JMP:
+        case CALL:
+        case OUT:
+        case IN:
             *arg1 = fetch();
             break;
+        case MOV:
         case JNZ:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            break;
         case JZ:
+        case NOT:
+        case LOAD:
+        case STOR:
             *arg1 = fetch();
             *arg2 = fetch();
             break;
+        case TEQ:
+        case TGT:
         case ADD:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
         case MUL:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
         case MOD:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
         case AND:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            *arg3 = fetch();
-            break;
         case OR:
             *arg1 = fetch();
             *arg2 = fetch();
             *arg3 = fetch();
             break;
-        case NOT:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            break;
-        case LOAD:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            break;
-        case STOR:
-            *arg1 = fetch();
-            *arg2 = fetch();
-            break;
-        case CALL:
-            *arg1 = fetch();
-            break;
-        case RET:
-            break;
-        case OUT:
-            *arg1 = fetch();
-            break;
-        case IN:
-            *arg1 = fetch();
-            break;
-        case NOP:
-            break;
         default:
             break;
     }