feat: decoder

Author: yizishun

rtl/src/backend/decode/Decoder.scala

@@ -113,6 +113,7 @@ class Decoder(decodeParameter: IDUParameter) extends Module {
   val uimm12 = inst(21, 10).asUInt.pad(32).asSInt
   val imm14  = Cat(inst(23, 10), 0.U(2.W)).asSInt.pad(32)
   val imm16  = Cat(inst(25, 10), 0.U(2.W)).asSInt.pad(32)
+  val nimm16  = inst(25, 10).asSInt.pad(32)
   val imm20  = Cat(inst(24, 5), 0.U(12.W)).asSInt.pad(32)
   val imm21  = Cat(inst(4, 0), inst(25, 10)).asSInt.pad(32)
   val imm26  = Cat(inst(9, 0), inst(25, 10), 0.U(2.W)).asSInt.pad(32)
@@ -126,6 +127,7 @@ class Decoder(decodeParameter: IDUParameter) extends Module {
       ImmTpe.UImm12 -> uimm12,
       ImmTpe.Imm14  -> imm14,
       ImmTpe.Imm16  -> imm16,
+      ImmTpe.NImm16  -> nimm16,
       ImmTpe.Imm20  -> imm20,
       ImmTpe.Imm21  -> imm21,
       ImmTpe.Imm26  -> imm26

rtl/src/backend/decode/InputPattern.scala

@@ -31,6 +31,7 @@ object InstructionPattern {
     val ui12   = Field("????????????", Arg("ui12", 21, 10))
     val i14    = Field("??????????????", Arg("i14", 23, 10))
     val i16    = Field("????????????????", Arg("i16", 25, 10))
+    val ni16    = Field("????????????????", Arg("ni16", 25, 10))
     val i20    = Field("????????????????????", Arg("i20", 24, 5))
     val i21h   = Field("????????????????", Arg("i21h", 25, 10))
     val i21l   = Field("?????", Arg("i21l", 4, 0))
@@ -53,6 +54,7 @@ object InstructionPattern {
     "2RUI12"  -> Seq(Fields.ui12, Fields.rj, Fields.rd),
     "2RI14"   -> Seq(Fields.i14, Fields.rj, Fields.rd),
     "2RI16"   -> Seq(Fields.i16, Fields.rj, Fields.rd),
+    "2RNI16"   -> Seq(Fields.ni16, Fields.rj, Fields.rd),
     "1RI20"   -> Seq(Fields.i20, Fields.rd),
     "1RI21"   -> Seq(Fields.i21h, Fields.rj, Fields.i21l),
     "I26"     -> Seq(Fields.i26h, Fields.i26l),
@@ -194,7 +196,7 @@ object PossibleInput {
       //CPUCFG
       InstructionPattern("CPUCFG", "0000000000000000011011", "2R"),
 
-      InstructionPattern("RRIWINZ", "111000", "2RI16"),
+      InstructionPattern("RRIWINZ", "111000", "2RNI16"),
 
       // format: on
     )

rtl/src/backend/decode/OutputField.scala

@@ -262,6 +262,7 @@ object ImmTpe extends ChiselEnum {
   val UImm12 = Value
   val Imm14  = Value
   val Imm16  = Value
+  val NImm16  = Value
   val Imm20  = Value
   val Imm21  = Value
   val Imm26  = Value
@@ -278,6 +279,7 @@ object ImmType extends DecodeField[InstructionPattern, ImmTpe.Type] {
       case "2RUI12" => BitPat(ImmTpe.UImm12.asUInt)
       case "2RI14"  => BitPat(ImmTpe.Imm14.asUInt)
       case "2RI16"  => BitPat(ImmTpe.Imm16.asUInt)
+      case "2RNI16"  => BitPat(ImmTpe.NImm16.asUInt)
       case "1RI20"  => BitPat(ImmTpe.Imm20.asUInt)
       case "1RI21"  => BitPat(ImmTpe.Imm21.asUInt)
       case "I26"    => BitPat(ImmTpe.Imm26.asUInt)