From 6e8759cc96f86b9ac9e3d762765f68b7415036b8 Mon Sep 17 00:00:00 2001
From: Jordan Carlin <jordanmcarlin@gmail.com>
Date: Wed, 19 Mar 2025 14:50:14 -0700
Subject: [PATCH] Trap on illegal instructions when no FPU

---
 src/ifu/ifu.sv | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ifu/ifu.sv b/src/ifu/ifu.sv
index a90483533..cc4576fd2 100644
--- a/src/ifu/ifu.sv
+++ b/src/ifu/ifu.sv
@@ -379,7 +379,7 @@ module ifu import cvw::*;  #(parameter cvw_t P) (
     assign InstrD = InstrRawD;
     assign IllegalIEUInstrD = IllegalBaseInstrD;
   end
-  assign IllegalIEUFPUInstrD = IllegalIEUInstrD & IllegalFPUInstrD;
+  assign IllegalIEUFPUInstrD = IllegalIEUInstrD & (IllegalFPUInstrD | !P.F_SUPPORTED);
 
   // Misaligned PC logic
   // Instruction address misalignment only from br/jal(r) instructions.