From 4bd46755e80d537aa25c24cf80f0618861c06336 Mon Sep 17 00:00:00 2001
From: Jerry Zhao <jerryz123@berkeley.edu>
Date: Tue, 14 May 2024 11:24:02 -0700
Subject: [PATCH] Decode vector insns as illegal when vill

---
 src/main/scala/rocket/RocketCore.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/rocket/RocketCore.scala b/src/main/scala/rocket/RocketCore.scala
index 8accdf817c..1521f7af4b 100644
--- a/src/main/scala/rocket/RocketCore.scala
+++ b/src/main/scala/rocket/RocketCore.scala
@@ -340,7 +340,7 @@ class Rocket(tile: RocketTile)(implicit p: Parameters) extends CoreModule()(p)
     val v_decode = rocketParams.vector.get.decoder(p)
     v_decode.io.inst := id_inst(0)
     v_decode.io.vconfig := csr.io.vector.get.vconfig
-    when (v_decode.io.legal) {
+    when (v_decode.io.legal && !csr.io.vector.get.vconfig.vtype.vill) {
       id_ctrl.legal := true.B
       id_ctrl.fp := v_decode.io.fp
       id_ctrl.rocc := false.B