Add instruction type classification to decode, w/ T

src/decode.c

@@ -21,4 +21,23 @@ a64inst_instruction *decode(word wrd) {
         fprintf(stderr, "Ran out of memory while attempting to decode an instruction!\n");
         exit(1);
     }
+
+    word DPImmFlag = getBits(wrd, DATA_PROCESSING_DPIMM_LSB, DATA_PROCESSING_DPIMM_MSB);
+    if (wrd == HALT_WORD) {
+        inst->type = a64inst_Halt;
+        
+    } else if (DPImmFlag == 0) {
+        inst->type = a64inst_DPImmediate;
+
+    }else if (DPImmFlag == 1) {
+        inst->type = a64inst_Branch;
+
+    } else if (getBits(wrd, DATA_PROCESSING_DPReg_LSB, DATA_PROCESSING_DPReg_MSB) == 1) {
+        inst->type = a64inst_DPRegister;
+
+    } else {
+        // Load and Store, or unknown
+    }
+    
+
 }

src/decode.h

@@ -2,5 +2,12 @@
 #include "a64instruction.h"
 
 #define BYTE_BITS 8
+#define HALT_WORD 0x8a000000
+
+#define DATA_PROCESSING_DPIMM_LSB 26
+#define DATA_PROCESSING_DPIMM_MSB 29
+
+#define DATA_PROCESSING_DPReg_LSB 25
+#define DATA_PROCESSING_DPReg_MSB 26
 
 a64inst_instruction *decode(word w);