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[Lightning] Re: Vector instructions?

From: Paolo Bonzini
Subject: [Lightning] Re: Vector instructions?
Date: Thu, 04 Oct 2007 12:00:09 +0200
User-agent: Thunderbird (Macintosh/20070728)

Sandro Magi wrote:
> Any plans to add SIMD instructions to Lightning? I believe this might
> require some notion of a "sub-architecture" since the instructions
> differ greatly based on CPU version.

Yes, that is the problem. Though as long as the SIMD width (e.g. 8/16 bytes) is told to the user with a macro, rather than hardcoded it should be possible to make the basic ones relatively portable. The problem is more fancy instructions like pack/unpack, which differ the most.


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