struct field alignment

[Denis Koroskin]

On Mon, 18 Oct 2010 06:00:49 +0400, Walter Bright  
<newshound2 at digitalmars.com> wrote:

> http://www.digitalmars.com/d/2.0/attribute.html#align
>
> Over time, it has become clear to me that there are only two useful  
> alignments:
>
>    align     // set to whatever the C ABI alignment is
>    align(1)  // pack everything in, no alignment padding
>
> I think any other alignments should be deprecated. Note that with  
> align(1), any alignment is achievable simply by adding in byte fields  
> where desired.

On some platforms it is desired to align struct Vec { float[4] data; } on  
16 bytes. I don't recall why now, but I know for sure we do that for all  
platforms (other than PC maybe). I guess that has something to do with  
vector operations.

Bikeshed note: how about align(C) to be consistent with both align(1) and  
extern(C)?