Allow SSE 4.1 optimization on the down channelizer

sdrbase/dsp/downchannelizer.cpp

@@ -186,6 +186,26 @@ void DownChannelizer::applyConfiguration()
 	}
 }
 
+#ifdef USE_SSE4_1
+DownChannelizer::FilterStage::FilterStage(Mode mode) :
+	m_filter(new IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>),
+	m_workFunction(0)
+{
+	switch(mode) {
+		case ModeCenter:
+			m_workFunction = &IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateCenter;
+			break;
+
+		case ModeLowerHalf:
+			m_workFunction = &IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateLowerHalf;
+			break;
+
+		case ModeUpperHalf:
+			m_workFunction = &IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>::workDecimateUpperHalf;
+			break;
+	}
+}
+#else
 DownChannelizer::FilterStage::FilterStage(Mode mode) :
 	m_filter(new IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>),
 	m_workFunction(0)
@@ -204,6 +224,7 @@ DownChannelizer::FilterStage::FilterStage(Mode mode) :
 			break;
 	}
 }
+#endif
 
 DownChannelizer::FilterStage::~FilterStage()
 {

sdrbase/dsp/downchannelizer.h

@@ -23,7 +23,11 @@
 #include <QMutex>
 #include "util/export.h"
 #include "util/message.h"
+#ifdef USE_SSE4_1
+#include "dsp/inthalfbandfiltereo1.h"
+#else
 #include "dsp/inthalfbandfilterdb.h"
+#endif
 
 #define DOWNCHANNELIZER_HB_FILTER_ORDER 48
 
@@ -69,8 +73,13 @@ protected:
 			ModeUpperHalf
 		};
 
+#ifdef USE_SSE4_1
+		typedef bool (IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>::*WorkFunction)(Sample* s);
+		IntHalfbandFilterEO1<DOWNCHANNELIZER_HB_FILTER_ORDER>* m_filter;
+#else
 		typedef bool (IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>::*WorkFunction)(Sample* s);
 		IntHalfbandFilterDB<DOWNCHANNELIZER_HB_FILTER_ORDER>* m_filter;
+#endif
 		WorkFunction m_workFunction;
 
 		FilterStage(Mode mode);