[rtl] draft new decode framework

chipsalliance · Jun 7, 2024 · b1d73a5 · b1d73a5
1 parent da14b25
commit b1d73a5
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Showing 2 changed files with 30 additions and 3 deletions.
diff --git a/t1/src/VectorDecoder.scala b/t1/src/VectorDecoder.scala
@@ -9,11 +9,11 @@ import chisel3.util.experimental.decode._
 import org.chipsalliance.t1.rtl.decoder.Decoder
 
 @instantiable
-class VectorDecoder(fpuEnable: Boolean) extends Module {
+class VectorDecoder(decoder: Decoder) extends Module {
   @public
   val decodeInput: UInt = IO(Input(UInt(32.W)))
   @public
-  val decodeResult: DecodeBundle = IO(Output(new DecodeBundle(Decoder.all(fpuEnable))))
+  val decodeResult: DecodeBundle = IO(Output(new DecodeBundle(decoder.all)))
 
   decodeResult := Decoder.decode(fpuEnable)(decodeInput)
 }
diff --git a/t1/src/decoder/Decoder.scala b/t1/src/decoder/Decoder.scala
@@ -5,9 +5,36 @@ package org.chipsalliance.t1.rtl.decoder
 
 import chisel3._
 import chisel3.util.BitPat
-import chisel3.util.experimental.decode.{DecodeField, BoolDecodeField, DecodeTable, DecodeBundle, DecodePattern}
+import chisel3.util.experimental.decode.{BoolDecodeField, DecodeBundle, DecodeField, DecodePattern, DecodeTable}
 import org.chipsalliance.rvdecoderdb
 import org.chipsalliance.rvdecoderdb.{Encoding, Instruction, InstructionSet}
+import org.chipsalliance.t1.rtl.T1Parameter
+
+trait T1DecodeFiled[D <: Data] extends DecodeField[T1DecodePattern, D] with FieldName
+
+trait T1BoolField extends T1DecodeFiled[Bool] with BoolDecodeField[T1DecodePattern]
+
+object logic extends T1BoolField {
+  override def genTable(pattern: T1DecodePattern): BitPat =
+    pattern.isLogic.value match {
+      case attribute.Y => y
+      case attribute.N => n
+      case attribute.DC => dc
+    }
+}
+
+class Decoder(t1Parameter: T1Parameter) {
+  def allFields: Seq[T1DecodeFiled[_ >: Bool <: UInt]] = Seq(
+    logic
+  )
+  def allDecodePattern = t1Parameter.allInstuctions.map(T1DecodePattern(_, t1Parameter)).toSeq.sortBy(_.instruction.name)
+
+  def decodeTable: DecodeTable[T1DecodePattern] =
+    new DecodeTable[T1DecodePattern](
+      allDecodePattern,
+      allFields
+    )
+}
 
 trait FieldName {
   def name: String = this.getClass.getSimpleName.replace("$", "")