[phobos] byte alignment for arrays

[Sean Kelly]

16, I believe.  I haven't heard of a larger min size being required.

On Jun 29, 2010, at 10:24 AM, Steve Schveighoffer wrote:

> 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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