From: Henner Zeller <h.zeller@acm.org>
Date: Mon, 6 Jun 2022 20:50:32 +0000 (-0700)
Subject: Avoid unnecessary copy of a potential large constant value.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9d41aa8e2888577fc2a57179b8d4a9a3a4e03f59;p=yosys.git

Avoid unnecessary copy of a potential large constant value.

The local variable is used just to iterate through the values, so
a const reference is all we need.
---

diff --git a/passes/fsm/fsmdata.h b/passes/fsm/fsmdata.h
index 4ba3b4e4f..97371efab 100644
--- a/passes/fsm/fsmdata.h
+++ b/passes/fsm/fsmdata.h
@@ -91,8 +91,8 @@ struct FsmData
 		if (reset_state < 0 || reset_state >= state_num)
 			reset_state = -1;
 
-		RTLIL::Const state_table = cell->parameters[ID::STATE_TABLE];
-		RTLIL::Const trans_table = cell->parameters[ID::TRANS_TABLE];
+		const RTLIL::Const &state_table = cell->parameters[ID::STATE_TABLE];
+		const RTLIL::Const &trans_table = cell->parameters[ID::TRANS_TABLE];
 
 		for (int i = 0; i < state_num; i++) {
 			RTLIL::Const state_code;