Fix comp_return_type

Author: AntoinePrv

include/xsimd/arch/xsimd_neon.hpp

@@ -223,7 +223,7 @@ namespace xsimd
              * comparison dispatchers *
              **************************/
 
-            template <class T>
+            template <class T, class Enable = void>
             struct comp_return_type_impl;
 
             template <>
@@ -232,8 +232,8 @@ namespace xsimd
                 using type = uint8x16_t;
             };
 
-            template <>
-            struct comp_return_type_impl<int8x16_t>
+            template <class T>
+            struct comp_return_type_impl<T, typename std::enable_if<std::is_same<T, int8x16_t>::value && !std::is_same<int8x16_t, uint8x16_t>::value>::type>
             {
                 using type = uint8x16_t;
             };
@@ -244,8 +244,8 @@ namespace xsimd
                 using type = uint16x8_t;
             };
 
-            template <>
-            struct comp_return_type_impl<int16x8_t>
+            template <class T>
+            struct comp_return_type_impl<T, typename std::enable_if<std::is_same<T, int16x8_t>::value && !std::is_same<int16x8_t, uint16x8_t>::value>::type>
             {
                 using type = uint16x8_t;
             };
@@ -256,8 +256,8 @@ namespace xsimd
                 using type = uint32x4_t;
             };
 
-            template <>
-            struct comp_return_type_impl<int32x4_t>
+            template <class T>
+            struct comp_return_type_impl<T, typename std::enable_if<std::is_same<T, int32x4_t>::value && !std::is_same<int32x4_t, uint32x4_t>::value>::type>
             {
                 using type = uint32x4_t;
             };
@@ -268,8 +268,8 @@ namespace xsimd
                 using type = uint64x2_t;
             };
 
-            template <>
-            struct comp_return_type_impl<int64x2_t>
+            template <class T>
+            struct comp_return_type_impl<T, typename std::enable_if<std::is_same<T, int64x2_t>::value && !std::is_same<int64x2_t, uint64x2_t>::value>::type>
             {
                 using type = uint64x2_t;
             };