From 6f971470f83b8e4ed29232be4b6cb5da89d50dc0 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Thu, 22 Aug 2019 08:37:27 -0700
Subject: Respect opt_expr -keepdc as per @cliffordwolf

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

(limited to 'passes')

diff --git a/passes/opt/opt_expr.cc b/passes/opt/opt_expr.cc
index c4da613ab..73f48317a 100644
--- a/passes/opt/opt_expr.cc
+++ b/passes/opt/opt_expr.cc
@@ -748,7 +748,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
 		if (cell->type.in(ID($shiftx), ID($shift))) {
 			SigSpec sig_a = assign_map(cell->getPort(ID::A));
 			int width;
-			bool trim_x = true;
+			bool trim_x = cell->type == ID($shiftx) || !keepdc;
 			bool trim_0 = cell->type == ID($shift);
 			for (width = GetSize(sig_a); width > 1; width--) {
 				if ((trim_x && sig_a[width-1] == State::Sx) ||
-- 
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