• Guillaume Piolat (10/10) Feb 19 2023 If my understanding is correct, the mere fact of having a:
• Steven Schveighoffer (8/21) Feb 19 2023 Yes.
• Steven Schveighoffer (9/11) Feb 19 2023 And BTW, you can override this by assigning a zero default:
• Guillaume Piolat (3/14) Feb 19 2023 TIL. Nice trick!

Guillaume Piolat <first.last spam.org> writes:

If my understanding is correct, the mere fact of having a:


     struct S
     {
         char[16384] array;
     }

And then using it anywhere, will necessarily lead to a S.init 
being created and linked, leading to a binary size inflation of 
16kb.
This is not a super high concern, but can inform design decisions.

Is this correct?

Steven Schveighoffer <schveiguy gmail.com> writes:

On 2/19/23 1:11 PM, Guillaume Piolat wrote:
 If my understanding is correct, the mere fact of having a:
 
 
      struct S
      {
          char[16384] array;
      }
 
 And then using it anywhere, will necessarily lead to a S.init being 
 created and linked, leading to a binary size inflation of 16kb.
 This is not a super high concern, but can inform design decisions.
 
 Is this correct?

Yes.

that's not the case for all-zero .init though. At least in 
`TypeInfo.initializer`, it's pointing to null with array size indicating 
the amount of zeroes to write.

Testing with run.dlang.io, switching between `char` and `int` changes 
the ASM output to show whether it's stored or not.

-Steve

Steven Schveighoffer <schveiguy gmail.com> writes:

On 2/19/23 1:26 PM, Steven Schveighoffer wrote:

 Testing with run.dlang.io, switching between `char` and `int` changes 
 the ASM output to show whether it's stored or not.

And BTW, you can override this by assigning a zero default:

```d
struct S
{
     char[16384] array = 0; // no .init storage
}
```

-Steve

Guillaume Piolat <first.last spam.org> writes:

On Sunday, 19 February 2023 at 18:29:05 UTC, Steven Schveighoffer 
wrote:
 On 2/19/23 1:26 PM, Steven Schveighoffer wrote:

 Testing with run.dlang.io, switching between `char` and `int` 
 changes the ASM output to show whether it's stored or not.

 And BTW, you can override this by assigning a zero default:

 ```d
 struct S
 {
     char[16384] array = 0; // no .init storage
 }
 ```

 -Steve

TIL. Nice trick!