Dead Code Elimination

[user1234]

On Sunday, 18 October 2026 at 15:33:17 UTC, libxmoc wrote:
> I noticed that dmd doesn't do DCE, my executable is quite large 
> for what it does. Any plan to add that? I tried to do it 
> myself, a simple bool in DSymbol + a visitor (yoinked it from 
> the unused import PR) to scan things, and it shrank build time 
> by ~15% and executable went down to 3.5mb from 5.5mb.
>
> Surely someone smarter than me could do even better.

It's hard to say when something is used, simple example:

```d
void unused(){}

void main()
{
     import core.stdc.stdio;
     printf("%p\n",&unused);
}
```

same problem with virtual functions.

Otherwise what you call DCE is rather WPO (whole program 
optimization).