From 71c6cbecdacd6355a9f72baa587289c47cb96a7f Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 15 Mar 2016 18:47:39 +0100
Subject: [PATCH] avoid memcpy if it's not needed.

besides, memcpy areas may not overlap
---
 libs/ardour/vst_plugin.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/vst_plugin.cc b/libs/ardour/vst_plugin.cc
index f04aa2bce1..1e49955422 100644
--- a/libs/ardour/vst_plugin.cc
+++ b/libs/ardour/vst_plugin.cc
@@ -600,7 +600,9 @@ VSTPlugin::connect_and_run (BufferSet& bufs,
 		if (!valid) {
 			continue;
 		}
-		copy_vector (bufs.get_audio(index).data(offset), outs[i], nframes);
+		if (outs[i] != bufs.get_audio(index).data(offset)) {
+			copy_vector (bufs.get_audio(index).data(offset), outs[i], nframes);
+		}
 	}
 	return 0;
 }