From eb7343e25aab68d3798c2c78d0806a507fd42d27 Mon Sep 17 00:00:00 2001
From: Vesa <contact.diizy@nbl.fi>
Date: Tue, 18 Nov 2014 09:19:56 +0200
Subject: [PATCH] Add denormal protection to Fifowriter thread

---
 include/Mixer.h    | 8 ++++++++
 src/core/Mixer.cpp | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/Mixer.h b/include/Mixer.h
index 76257618a..9319959b6 100644
--- a/include/Mixer.h
+++ b/include/Mixer.h
@@ -25,6 +25,14 @@
 #ifndef _MIXER_H
 #define _MIXER_H
 
+// denormals stripping
+#ifdef __SSE__
+#include <xmmintrin.h>
+#endif
+#ifdef __SSE3__
+#include <pmmintrin.h>
+#endif
+
 #include "lmmsconfig.h"
 
 #ifndef LMMS_USE_3RDPARTY_LIBSRC
diff --git a/src/core/Mixer.cpp b/src/core/Mixer.cpp
index ae17e08ec..488ea3138 100644
--- a/src/core/Mixer.cpp
+++ b/src/core/Mixer.cpp
@@ -902,6 +902,15 @@ Mixer::fifoWriter::fifoWriter( Mixer* mixer, fifo * _fifo ) :
 	m_fifo( _fifo ),
 	m_writing( true )
 {
+	// set denormal protection for this thread
+	#ifdef __SSE3__
+	/* DAZ flag */
+	_MM_SET_DENORMALS_ZERO_MODE( _MM_DENORMALS_ZERO_ON );
+	#endif
+	#ifdef __SSE__
+	/* FTZ flag */
+	_MM_SET_FLUSH_ZERO_MODE( _MM_FLUSH_ZERO_ON );
+	#endif
 }