Hello, guys!

I have Matrix class(that contains an array of 16 floats) and SSE code to mult it.
It's neccessary to have an array alignment 16.

I'm figured out simple test-code:

align(16) struct S {
	align(16) int a;
}


void main() {
	align(16) S s;
	writeln(cast(void *)&s.a);
}

And it prints 18FCC8, but must ends with "0". What i'm doing wrong?

Thanks.

Sorry, not class, but struct.

Temtaime wrote:
> What i'm doing wrong?

Maybey nothing than thinking---that the adress is printed in the number of bits, whereas it is printed in the number of bytes.

-manfred

i guess, because of allocated on stack:

import std.stdio;

align(16) struct S
{
  align(16) int a;
}

S sGlobal;

void main()
{
  S sLocal;
  writefln("0x%08X 0x%08X", cast(uint) &sGlobal, cast(uint) &sLocal);
}

0x00162110 0x0012FE14

but, IMHO, this is not good

Related?
http://d.puremagic.com/issues/show_bug.cgi?id=2278

Perhaps related:
http://forum.dlang.org/thread/mailman.990.1370788529.13711.digitalmars-d-ldc@puremagic.com?page=3#post-pecxybsbjdsnuljtyqjm:40forum.dlang.org

Bye,
bearophile

On Saturday, 10 August 2013 at 20:36:24 UTC, Temtaime wrote:
> Hello, guys!
>
> I have Matrix class(that contains an array of 16 floats) and SSE code to mult it.
> It's neccessary to have an array alignment 16.
>
> I'm figured out simple test-code:
>
> align(16) struct S {
> 	align(16) int a;
> }
>
>
> void main() {
> 	align(16) S s;
> 	writeln(cast(void *)&s.a);
> }
>
> And it prints 18FCC8, but must ends with "0". What i'm doing wrong?
>
> Thanks.

Perhaps core.simd (http://dlang.org/phobos/core_simd.html) could be of help. I believe that those types should be aligned.