What is the __udivdi3 __umoddi3 function?

[lili]

On Thursday, 22 August 2019 at 20:39:32 UTC, David Nadlinger 
wrote:
> 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

Thanks a lot.