Fix LUI and AUIPC instructions

src/main/scala/ALU.scala

@@ -34,8 +34,10 @@ class ALU extends Module {
     ALUOps.COPY_A -> (data1U),
     ALUOps.COPY_B -> (data2U),
     ALUOps.ADDR   -> ((data1S + data2S) & 0xFFFFFFFE.S).asUInt,
-    ALUOps.LUI    -> (data2U << 12.U).asUInt,
-    ALUOps.AUIPC  -> (data1U + (data2U << 12.U)),
+    // These two are a remenant from an older version. I could use COPY_B and ADD instead.
+    // But they don't do any harm, and it's more work to removing them
+    ALUOps.LUI    -> data2U,
+    ALUOps.AUIPC  -> (data1U + data2U),
   )
 
   io.result := MuxLookup(

src/main/scala/Decoder.scala

@@ -57,8 +57,8 @@ class Decoder() extends Module {
     BGE    -> List(N,        N,        N,       N,        Y,         Y,       N,    branchType.gte,  BTYPE,        ALUOps.ADD),
     BGEU   -> List(N,        N,        N,       N,        Y,         Y,       N,    branchType.gteu, BTYPE,        ALUOps.ADD),
 
-    LUI    -> List(N,        Y,        N,       N,        Y,         N,       N,    branchType.DC,   ImmFormat.DC, ALUOps.LUI),
-    AUIPC  -> List(N,        Y,        N,       N,        Y,         N,       N,    branchType.DC,   ImmFormat.DC, ALUOps.AUIPC),
+    LUI    -> List(N,        Y,        N,       N,        Y,         N,       N,    branchType.DC,   UTYPE,        ALUOps.LUI),
+    AUIPC  -> List(N,        Y,        N,       N,        Y,         N,       N,    branchType.DC,   UTYPE,        ALUOps.AUIPC),
 
     ADD    -> List(N,        Y,        N,       N,        N,         N,       N,    branchType.DC,   ImmFormat.DC, ALUOps.ADD),
     ADDI   -> List(N,        Y,        N,       N,        Y,         N,       N,    branchType.DC,   ITYPE,        ALUOps.ADD),