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hi! bil til
Thanks for your answer!
 but I want to know what is this place
  return hashmod(t, cast_int(ui));  //------------------------------------------      

 Why do you want to use `cast_int(ui)`

bil til <> 于2023年1月20日周五 22:00写道:
such a cast typically does not produce code in assembler...

it is just an instruction for the compiler, to use the correct
comparison operator (in this case "unsigned <= unsigned").

If you would not do such casting, in "best case" you would get C
compiler warnings or errors - in worst case severe
"misunderstandings"... .