From: Clifford Wolf <clifford@clifford.at>
Date: Wed, 31 Dec 2014 02:56:09 +0000 (+0100)
Subject: IdString optimization
X-Git-Tag: yosys-0.5~166
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d6a7fe2ce8936c7af09ba7661e1159bc403483d;p=yosys.git

IdString optimization
---

diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index 739b701f8..c40af88aa 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -121,6 +121,12 @@ namespace RTLIL
 			global_id_index_[global_id_storage_.at(idx)] = idx;
 			global_refcount_storage_.at(idx)++;
 
+			// Avoid Create->Delete->Create pattern
+			static IdString last_created_id;
+			put_reference(last_created_id.index_);
+			last_created_id.index_ = idx;
+			get_reference(last_created_id.index_);
+
 			if (yosys_xtrace) {
 				log("#X# New IdString '%s' with index %d.\n", p, idx);
 				log_backtrace("-X- ", yosys_xtrace-1);