COMPMID-417: Change rounding mode of half reference

Change-Id: Ib72bd0ce1cc0ea5fb474cb6f1b09a030a4162bb8
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/81922
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/tests/validation/half.h b/tests/validation/half.h
index fb2235a..d8aa341 100644
--- a/tests/validation/half.h
+++ b/tests/validation/half.h
@@ -29,5 +29,9 @@
 #define HALF_ENABLE_CPP11_CMATH 0
 #endif /* __ANDROID__ */
 
+// Set style to round to nearest
+#define HALF_ROUND_STYLE 1
+#define HALF_ROUND_TIES_TO_EVEN 1
+
 #include "half/half.hpp"
 #endif /* __ARM_COMPUTE_TEST_HALF_H__ */