From 3dc58def3c0d36166b80d25313b4e3c56001f2f9 Mon Sep 17 00:00:00 2001
From: Hansung Kim <hansung_kim@berkeley.edu>
Date: Wed, 1 May 2024 15:51:53 -0700
Subject: [PATCH] Add parallel flag to VCS/Verilator C compilation

---
 sims/vcs/vcs.mk         | 1 +
 sims/verilator/Makefile | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/sims/vcs/vcs.mk b/sims/vcs/vcs.mk
index 9913481c..3876a43d 100644
--- a/sims/vcs/vcs.mk
+++ b/sims/vcs/vcs.mk
@@ -36,6 +36,7 @@ VCS_CC_OPTS = \
 	$(filter -l%,$(VCS_LDFLAGS))
 
 VCS_NONCC_OPTS = \
+	-j36 \
 	-notice \
 	-line \
 	+lint=all,noVCDE,noONGS,noUI,noPCTIO-L,noPCTI-L \
diff --git a/sims/verilator/Makefile b/sims/verilator/Makefile
index d90c4c38..12c793b0 100644
--- a/sims/verilator/Makefile
+++ b/sims/verilator/Makefile
@@ -195,13 +195,13 @@ model_mk_debug = $(model_dir_debug)/V$(TB).mk
 $(model_mk): $(sim_common_files) $(EXTRA_SIM_REQS)
 	rm -rf $(model_dir)
 	mkdir -p $(model_dir)
-	$(VERILATOR) $(VERILATOR_OPTS) $(EXTRA_SIM_SOURCES) -o $(sim) -Mdir $(model_dir)
+	$(VERILATOR) -j 36 $(VERILATOR_OPTS) $(EXTRA_SIM_SOURCES) -o $(sim) -Mdir $(model_dir)
 	touch $@
 
 $(model_mk_debug): $(sim_common_files) $(EXTRA_SIM_REQS)
 	rm -rf $(model_dir_debug)
 	mkdir -p $(model_dir_debug)
-	$(VERILATOR) $(VERILATOR_OPTS) +define+DEBUG $(EXTRA_SIM_SOURCES) -o $(sim_debug) $(TRACING_OPTS) -Mdir $(model_dir_debug)
+	$(VERILATOR) -j 36 $(VERILATOR_OPTS) +define+DEBUG $(EXTRA_SIM_SOURCES) -o $(sim_debug) $(TRACING_OPTS) -Mdir $(model_dir_debug)
 	touch $@
 
 #########################################################################################