Help needed on inline assembly

[Hendrik Renken]

Jarrett Billingsley schrieb:
> "Hendrik Renken" <funsheep at -[no-spam]-gmx.net> wrote in message 
> news:fnprum$6oh$1 at digitalmars.com...
>> float[4] array = [ 1f, 2f, 3f, 4f ];
>>
>> void main()
>> {
>> float* a = &array[0];
>>
>> asm
>> {
>> mov EAX, a;
>> movaps XMM1, [EAX];
>> }
>> }
> 
> If you're using the newest DMD, this should work, it does for me.

Now i've updated to 1.026. And the above example doesnt work (still not
aligned) movups works.



> If you're 
> using anything older than 1.023 (like, hm, 1.015?  GRRGH), this will 
> probably fail. 

Yeah. I used 1.015 before...


> 1.023 made anything in the static data segment >= 16 bytes 
> paragraph aligned, so that data is already aligned properly.

Doesnt seem to work for me (using DMD 1.026 on linux). Or the aligment
is in 1.026 broken again...



> I don't know what GDC does in this case.
> 
> Another way to get an aligned allocation is to use a struct with the 
> float[4] in it.
> 
> struct vec
> {
>     float[4] array;
> }
> 
> void main()
> {
>     vec* v = new vec;
> 
>     // ptr will get you the pointer to the 0th element too
>     float* a = v.array.ptr;
> 
>     asm
>     {
>         mov EAX, a;
>         movaps XMM1, [EAX];
>     }
> }
> 
> This also doesn't rely on any standard library stuff. 
> 
>