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/CL/ConvolutionLayer.cpp b/tests/validation/CL/ConvolutionLayer.cpp
index 6082ab4..5700771 100644
--- a/tests/validation/CL/ConvolutionLayer.cpp
+++ b/tests/validation/CL/ConvolutionLayer.cpp
@@ -45,7 +45,7 @@
 
 namespace
 {
-const float tolerance_f16 = 1.1f;   /**< Tolerance value for comparing reference's output against implementation's output for DataType::F16 */
+const float tolerance_f16 = 0.1f;   /**< Tolerance value for comparing reference's output against implementation's output for DataType::F16 */
 const float tolerance_f32 = 1e-03f; /**< Tolerance value for comparing reference's output against implementation's output for DataType::F32 */
 const float tolerance_q   = 1.0f;   /**< Tolerance value for comparing reference's output against implementation's output for fixed point data types */
 
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__ */