abs now returns unsigned zero when input is a signed zero

Author: ndgrigorian

dpctl/tensor/libtensor/include/kernels/elementwise_functions/abs.hpp

@@ -65,15 +65,16 @@ template <typename argT, typename resT> struct AbsFunctor
     {
 
         if constexpr (std::is_same_v<argT, bool> ||
-                      (std::is_integral<argT>::value &&
-                       std::is_unsigned<argT>::value))
-        {
+                      std::is_unsigned<argT>::value) {
             static_assert(std::is_same_v<resT, argT>);
             return x;
         }
-        else {
+        else if (std::is_integral<argT>::value || is_complex<argT>::value) {
             return std::abs(x);
         }
+        else {
+            return (x == argT(0)) ? resT(0) : resT(std::abs(x));
+        }
     }
 };