"New ISA Prefix Fusion"

By: dmcq (dmcq.delete@this.fano.co.uk), August 18, 2020 12:00 pm
Room: Moderated Discussions
hobold (hobold.delete@this.vectorizer.org) on August 18, 2020 11:58 am wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on August 18, 2020 4:48 am wrote:
> [...]
> > BTW, Power ISA™ Version 3.1 manual is here https://ibm.ent.box.com/s/hhjfw0x0lrbtyzmiaffnbxh2fuo0fog0
> >
>
> Thanks for the link!
>
> Looks like they are really serious about autovectorization. Quite a few SIMD
> bits to round out functionality, and more interoperation between scalar and
> SIMD. They even have "vector centrifuge" now ... that is ... interesting.

Gah! You can't split a prefixed instruction over a 64 byte boundary. I wonder why they felt it necessary to impose that.

I like that centrifuge! It'd be an interesting little design challenge to make something that implements it efficiently.
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