use compiler intrinsics for windows x64 build (FSBUILD-131)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12246 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/voipcodecs/src/voipcodecs/dc_restore.h

@@ -127,17 +127,34 @@ __inline long lrintf (float flt)
 	return retval;
 }
 #elif defined(_WIN64)
+#include <intrin.h>
+
     __inline__ long int rint(double x)
     {
-        return (long int) (x);
+#ifdef _M_X64
+		return (long int)_mm_cvtsd_si64x( _mm_loadu_pd ((const double*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 	__inline__ int rintf(float x)
 	{
-		return (int) rint((double) x);
+#ifdef _M_X64
+		return _mm_cvt_ss2si( _mm_load_ss((const float*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (int) (x);
+#endif
 	}
     __inline__ long int lrintf(float x)
     {
-        return (long int) (x);
+#ifdef _M_X64
+		return _mm_cvt_ss2si( _mm_load_ss((const float*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 #endif