Re: align(16) struct member throws an exception with movdqa

[Kapps]

On Monday, 11 June 2012 at 03:19:08 UTC, ixid wrote:
    struct a
    {   align(16) int[4] test = [1,2,3,4];
    }
    a test;
    asm
    {
            movdqa XMM0, test   ;
            addps XMM0, XMM0    ;
            movdpa test, XMM0   ;
    }

This works fine with unaligned movdqu but throws an access 
violation exception with movdqa. Why isn't align letting me do 
an aligned read? How should I do an aligned read?

IIRC, you're supposed to be able to do something like align(16) 
struct a, but it doesn't work when a is created on the stack. 
That was the conclusion I found when trying to implement my own 
vector type a year ago anyways.