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Re: SSE2(/AVX) and alignment issues [message #30975 is a reply to message #30974]

Sun, 30 January 2011 20:08

mirek is currently offline

mirek
Messages: 13984
Registered: November 2005

Ultimate Member

Novo wrote on Sun, 30 January 2011 13:35

mirek wrote on Sun, 30 January 2011 12:24

Anyway, deeper research has revealed that all this is somewhat obsolete. Where I am heading now is larger vectors of values that are fully encapsulated in some object (which can keep proper alignment) and using the most advanced ISA available... Smile

Smile

Could you please explain this in more details? Smile

Smile

As far as I understand you are going to use CPU dispatching.

TIA

Well, first of all, all of this is so far purely theoretical.

Anyway, I think the right idea is to emulate "vector processor", define float/double vector classes and operations on them.

I mean something like

DoubleVector x(200), y(200);
double a;

x = a * x + y;

and then, in implementation, use SSE2 or AVX or whatever to speed things up...

At this point, allocation is internal bussines of DoubleVector and alignment does not cause any problems anymore.

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[Message index]

		SSE2(/AVX) and alignment issues By: mirek on Fri, 28 January 2011 10:55
		Re: SSE2(/AVX) and alignment issues By: tojocky on Fri, 28 January 2011 13:48
		Re: SSE2(/AVX) and alignment issues By: cbpporter on Fri, 28 January 2011 13:55
		Re: SSE2(/AVX) and alignment issues By: Didier on Fri, 28 January 2011 18:43
		Re: SSE2(/AVX) and alignment issues By: mirek on Sat, 29 January 2011 00:05
		Re: SSE2(/AVX) and alignment issues By: mirek on Fri, 28 January 2011 23:59
		Re: SSE2(/AVX) and alignment issues By: Novo on Fri, 28 January 2011 21:53
		Re: SSE2(/AVX) and alignment issues By: mirek on Sat, 29 January 2011 00:03
		Re: SSE2(/AVX) and alignment issues By: Novo on Sat, 29 January 2011 02:07
		Re: SSE2(/AVX) and alignment issues By: tojocky on Sat, 29 January 2011 09:23
		Re: SSE2(/AVX) and alignment issues By: mirek on Sat, 29 January 2011 20:29
		Re: SSE2(/AVX) and alignment issues By: tojocky on Sun, 30 January 2011 11:34
		Re: SSE2(/AVX) and alignment issues By: mirek on Sun, 30 January 2011 11:51
		Re: SSE2(/AVX) and alignment issues By: tojocky on Sun, 30 January 2011 16:52
		Re: SSE2(/AVX) and alignment issues By: mirek on Sun, 30 January 2011 18:24
		Re: SSE2(/AVX) and alignment issues By: Novo on Sun, 30 January 2011 19:35
		Re: SSE2(/AVX) and alignment issues By: mirek on Sun, 30 January 2011 20:08
		Re: SSE2(/AVX) and alignment issues By: Novo on Sun, 30 January 2011 20:50
		Re: SSE2(/AVX) and alignment issues By: dolik.rce on Sun, 30 January 2011 21:48
		Re: SSE2(/AVX) and alignment issues By: tojocky on Sun, 30 January 2011 22:03

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