feat(decode): implement xori ori andi addiw

Author: EmbroiderSnow

sim/src/decode.c

@@ -92,8 +92,11 @@ void decode_exec(Decode *s){
     INSTPAT("0000000 ????? ????? 001 ????? 00110 11", slliw  , I, R(rd) = SEXT((uint32_t)src1 << (imm & 0x1f), 32));
     INSTPAT("0000000 ????? ????? 101 ????? 00110 11", srliw  , I, R(rd) = SEXT((uint32_t)src1 >> (imm & 0x1f), 32));
     INSTPAT("0100000 ????? ????? 101 ????? 00110 11", sraiw  , I, R(rd) = SEXT((int32_t)src1 >> (imm & 0x1f), 32));
-    // XORI, ORI, ANDI
-    // ADDIW
+    // XORI, ORI, ANDI, ADDIW
+    INSTPAT("??????? ????? ????? 100 ????? 00100 11", xori   , I, R(rd) = src1 ^ imm);
+    INSTPAT("??????? ????? ????? 110 ????? 00100 11", ori    , I, R(rd) = src1 | imm);
+    INSTPAT("??????? ????? ????? 111 ????? 00100 11", andi   , I, R(rd) = src1 & imm);
+    INSTPAT("??????? ????? ????? 000 ????? 00110 11", addiw  , I, R(rd) = SEXT((int32_t)src1 + (int32_t)imm, 32));
     // ADD, SUB, SLL, SLT, SLTU, XOR, SRL, SRA, OR, AND
     // ADDW, SUBW, SLLW, SRLW, SRAW
     // FENCE, FENCE.I