From a23d9409e7d04fcfa31a139d0cf6169be4c46fca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Sat, 22 May 2021 20:27:51 +0200
Subject: opt_mem: Remove write ports with const-0 EN.
Fixes #2765.
---
passes/opt/opt_mem.cc | 12 ++++++++++++
1 file changed, 12 insertions(+)
(limited to 'passes/opt/opt_mem.cc')
diff --git a/passes/opt/opt_mem.cc b/passes/opt/opt_mem.cc
index 49a0ac51a..0409fb736 100644
--- a/passes/opt/opt_mem.cc
+++ b/passes/opt/opt_mem.cc
@@ -52,6 +52,18 @@ struct OptMemPass : public Pass {
int total_count = 0;
for (auto module : design->selected_modules()) {
for (auto &mem : Mem::get_selected_memories(module)) {
+ bool changed = false;
+ for (auto &port : mem.wr_ports) {
+ if (port.en.is_fully_zero()) {
+ port.removed = true;
+ changed = true;
+ total_count++;
+ }
+ }
+ if (changed) {
+ mem.emit();
+ }
+
if (mem.wr_ports.empty() && mem.inits.empty()) {
mem.remove();
total_count++;
--
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