Add a RAII wrapper for enabling flush-to-zero

src/common/utils.cpp

@@ -17,6 +17,7 @@
 #include "utils.h"
 
 #include <sched.h>
+#include <xmmintrin.h>
 #include <boost/process/environment.hpp>
 
 namespace bp = boost::process;
@@ -46,3 +47,12 @@ bool set_realtime_priority(bool sched_fifo, int priority) {
     return sched_setscheduler(0, sched_fifo ? SCHED_FIFO : SCHED_OTHER,
                               &params) == 0;
 }
+
+ScopedFlushToZero::ScopedFlushToZero() {
+    old_ftz_mode = _MM_GET_FLUSH_ZERO_MODE();
+    _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
+}
+
+ScopedFlushToZero::~ScopedFlushToZero() {
+    _MM_SET_FLUSH_ZERO_MODE(old_ftz_mode);
+}