Enable denormals-are-zero (DAZ) mode in engine

src/engine.cpp

@@ -7,6 +7,7 @@
 #include <chrono>
 #include <thread>
 #include <xmmintrin.h>
+#include <pmmintrin.h>
 
 #include "engine.hpp"
 #include "util.hpp"
@@ -113,9 +114,10 @@ static void engineStep() {
 }
 
 static void engineRun() {
-	// Set CPU to denormals-are-zero mode
-	// http://carlh.net/plugins/denormals.php
+	// Set CPU to flush-to-zero (FTZ) and denormals-are-zero (DAZ) mode
+	// https://software.intel.com/en-us/node/682949
 	_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
+	_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
 
 	// Every time the engine waits and locks a mutex, it steps this many frames
 	const int mutexSteps = 64;