What is the __udivdi3 __umoddi3 function?

[David Nadlinger]

Hi there,

On 22 Aug 2019, at 21:20, lili via digitalmars-d-ldc wrote:
>   I writing a OS in D, compile with -betterC -c, but when call a 
> variable template function
>   where has __udivdi3  __umoddi3 undefined symbol, can not link with 
> ld,  how to resolve it.
>   see code below

These are software implementations of integer arithmetic where the 
desired operation is not natively available on the target CPU (e.g. 64 
bit integer division on a 32 bit target).

You can find an implementation in the compiler-rt project (or libgcc), 
which you can link into your kernel as needed. You might be able to get 
around this by not using 64 bit integers in your code if 32 bits 
suffice.

  — David