[phobos] byte alignment for arrays

[Steve Schveighoffer]

No, it should never change.  If it changes, then it's a runtime value, and that hurts performance.

In that case, what should it be?  16 on 32-bit is a given, what about 64-bit?

-Steve



----- Original Message ----
> From: Sean Kelly <sean at invisibleduck.org>
> To: Discuss the phobos library for D <phobos at puremagic.com>
> Sent: Tue, June 29, 2010 12:48:39 PM
> Subject: Re: [phobos] byte alignment for arrays
> 
> I think it should be enough just to make it a documented requirement for 
> allocators.  It's not like it will ever change, right?

On Jun 28, 
> 2010, at 2:07 PM, Steve Schveighoffer wrote:

> All,
> 
> 
> Should there be something in the runtime that defines the minimum align size for 
> things like memory blocks?  That might make this easier to deal with from a 
> design perspective...
> 
> ----- Original Message ----
>> 
> From: Jason Spencer <
> href="mailto:spencer8 at sbcglobal.net">spencer8 at sbcglobal.net>
>> 
> 
>> Hmmm.  The natural thing would be to have some type to 
> describe these 
>> 128-bit values (akin to __m128 in gcc, Intel and MS 
> compilers) and use sizeof on 
>> that.  I don't see that D has any 
> MMX/SSE intrinsics, so I don't know if 
>> there is a standard 
> type.  If you don't have such a thing defined by the 
>> compiler, 
> I'd be tempted to define it, based on which version of the compiler 
>> 
> will compile this code (i.e. 32- or 64-bit dmd).  Then you can use that in 
> 
>> your sizeof.  Maybe you'll get lucky, and that will become 
> standard 
>> :)
> 
> 
> 
> 
> 
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