From 5597270b9e2331d8836c8c24a073aadc1e19584a Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddieh@ece.ubc.ca>
Date: Thu, 21 Mar 2019 10:20:27 -0700
Subject: [PATCH] Opt

---
 passes/techmap/shregmap.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/passes/techmap/shregmap.cc b/passes/techmap/shregmap.cc
index 028f4ba35..d5221d46f 100644
--- a/passes/techmap/shregmap.cc
+++ b/passes/techmap/shregmap.cc
@@ -102,7 +102,7 @@ struct ShregmapTechXilinx7 : ShregmapTech
 
 	virtual void init(const Module* module, const SigMap &sigmap) override
 	{
-		for (auto i : module->cells_) {
+		for (const auto &i : module->cells_) {
 			auto cell = i.second;
 			if (cell->type != "$shiftx") continue;
 			if (cell->getParam("\\Y_WIDTH") != 1) continue;