About the 16byte alignment, of 4floats, its mostlikely for SSE :) On 18 October 2010 04:16, Denis Koroskin <2kor...@gmail.com> wrote:
> On Mon, 18 Oct 2010 06:00:49 +0400, Walter Bright < > newshou...@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)? > -- // Yours sincerely // Emil 'Skeen' Madsen
