Update src/KernelAbstractions.jl

Co-authored-by: Simon Byrne <simonbyrne@gmail.com>

Author: charleskawczynski

src/KernelAbstractions.jl

@@ -238,21 +238,16 @@ macro print(items...)
     end
 end
 
-@generated function promote_c_argument(arg)
-    # > When a function with a variable-length argument list is called, the variable
-    # > arguments are passed using C's old ``default argument promotions.'' These say that
-    # > types char and short int are automatically promoted to int, and type float is
-    # > automatically promoted to double. Therefore, varargs functions will never receive
-    # > arguments of type char, short int, or float.
-
-    if arg == Cchar || arg == Cshort
-        return :(Cint(arg))
-    elseif arg == Cfloat
-        return :(Cdouble(arg))
-    else
-        return :(arg)
-    end
-end
+# When a function with a variable-length argument list is called, the variable
+# arguments are passed using C's old ``default argument promotions.'' These say that
+# types char and short int are automatically promoted to int, and type float is
+# automatically promoted to double. Therefore, varargs functions will never receive
+# arguments of type char, short int, or float.
+
+promote_c_argument(arg) = arg
+promote_c_argument(arg::Cfloat) = Cdouble(arg)
+promote_c_argument(arg::Cchar) = Cint(arg)
+promote_c_argument(arg::Cshort) = Cint(arg)
 
 """
     @printf(fmt::String, args...)