Implements stage 5

src/main/scala/projet/ImmediateDecoder.scala

@@ -0,0 +1,31 @@
+package projet
+
+import chisel3._
+import chisel3.util.switch
+import chisel3.util.is
+import chisel3.util.Cat
+import chisel3.util.Fill
+
+class ImmediateDecoder extends Module {
+    import projet.OpType
+
+    val io = IO(new Bundle {
+        val op_type = Input(OpType())
+        val instruction = Input(UInt(32.W))
+        val immediate = Output(UInt(32.W))
+    })
+    io.immediate := 0.U
+
+    // Decode imm-u
+    val imm_u = Cat(io.instruction(31, 12), 0.U(12.W));
+    // Decode imm-i
+    val imm_i = Cat(Fill(20, io.instruction(31)), io.instruction(31, 20));
+    switch(io.op_type) {
+        is(OpType.U) {
+            io.immediate := imm_u
+        }
+        is(OpType.I) {
+            io.immediate := imm_i
+        }
+    }
+}