From: Pepijn de Vos <pepijndevos@gmail.com>
Date: Thu, 5 Sep 2019 14:38:47 +0000 (+0200)
Subject: use singleton ground and vcc nets, apparently this makes pnr happier
X-Git-Tag: working-ls180~956^2~28
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7a43be5e431f7518203b37bad2eb9ffb3b74add4;p=yosys.git

use singleton ground and vcc nets, apparently this makes pnr happier
---

diff --git a/techlibs/gowin/synth_gowin.cc b/techlibs/gowin/synth_gowin.cc
index 4d32f62d4..3581d050e 100644
--- a/techlibs/gowin/synth_gowin.cc
+++ b/techlibs/gowin/synth_gowin.cc
@@ -212,7 +212,7 @@ struct SynthGowinPass : public ScriptPass
 		{
 			run("techmap -map +/gowin/cells_map.v");
 			run("setundef -undriven -zero");
-			run("hilomap -hicell VCC V -locell GND G");
+			run("hilomap -singleton -hicell VCC V -locell GND G");
 			run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O", "(unless -noiopads)");
 			run("dffinit  -ff DFF Q INIT");
 			run("clean");