From: Clifford Wolf <clifford@clifford.at>
Date: Fri, 17 Jan 2014 15:42:40 +0000 (+0100)
Subject: Added support for $adff with undef data inputs to opt_rmdff
X-Git-Tag: yosys-0.2.0~168
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2e370d5a2f364a469f11a2dc6f4217a9e9880a1c;p=yosys.git

Added support for $adff with undef data inputs to opt_rmdff
---

diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc
index a84bf4376..9ce98004e 100644
--- a/passes/opt/opt_rmdff.cc
+++ b/passes/opt/opt_rmdff.cc
@@ -92,6 +92,12 @@ static bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
 		}
 	}
 
+	if (sig_d.is_fully_undef() && sig_d.width == int(val_rv.bits.size())) {
+		RTLIL::SigSig conn(sig_q, val_rv);
+		mod->connections.push_back(conn);
+		goto delete_dff;
+	}
+
 	if (sig_d.is_fully_const() && sig_r.width == 0) {
 		RTLIL::SigSig conn(sig_q, sig_d);
 		mod->connections.push_back(conn);