From 3958a6ad8f6ff8ac0bd3133bff1db598bed63052 Mon Sep 17 00:00:00 2001
From: Albin Chaboissier <chalbin73@gmail.com>
Date: Thu, 13 Nov 2025 10:13:23 +0100
Subject: [PATCH] Adds verilator flags (seemingly not working)

---
 build.sc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/build.sc b/build.sc
index ccfc53b..f5da2bc 100644
--- a/build.sc
+++ b/build.sc
@@ -51,6 +51,13 @@ object `TPchisel` extends SbtModule { m =>
         )
 
         val nproc = sys.env.get("NPROC").getOrElse("1");
+
+        override def forkEnv = T {
+            super.forkEnv() ++ Map(
+                "VERILATOR_FLAGS" -> "--O3 --noassert --no-coverage --x-assign fast --x-initial fast --trace-fst -CFLAGS -O3 -CFLAGS -march=native -CFLAGS -flto -LDFLAGS -flto --threads 4",
+                "VERILATOR_RECOMPILE" -> "false"
+            )
+        }
         override def forkArgs = super.forkArgs() ++ Seq(
             "-Dscalatest.parallel.enabled=true",
             "-Dscalatest.parallel.mode=concurrent",