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sunsetquest
Adept II

AMD GCN4 ISA specification?

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AMD Team,

Now that Polaris has been released, can developers have access to the GCN4 Instruction Set Architecture specification? 

I looked around and can only find previous generation GPU GCN ISA documentation.

Maybe it is posted but I am not seeing it or the Polaris Architecture uses GCN3? (ISA already posted)

Thank you.

Ryan

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bridgman
Staff
Staff

Re: AMD GCN4 ISA specification?

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IIRC the Polaris shader core uses the same ISA as Stoney Ridge, which in turn is only slightly different (maybe zero difference, will check) from the rest of the VI family so not worth a new ISA guide. Polaris is largely backwards-compatible with earlier parts... the HW changes were aimed at faster execution rather than different functionality.

The LLVM compiler source has been updated to include Polaris support.

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bridgman
Staff
Staff

Re: AMD GCN4 ISA specification?

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IIRC the Polaris shader core uses the same ISA as Stoney Ridge, which in turn is only slightly different (maybe zero difference, will check) from the rest of the VI family so not worth a new ISA guide. Polaris is largely backwards-compatible with earlier parts... the HW changes were aimed at faster execution rather than different functionality.

The LLVM compiler source has been updated to include Polaris support.

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sunsetquest
Adept II

Re: AMD GCN4 ISA specification?

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Thank you for getting back to me. Sorry for the late reply, I was out of town.

I'll reference the GCN3 manual for Polaris.

It’s kind of nice that the instruction set/machine format has not changed much as it’s sometimes a pain for some developers to repair the current low-level stuff when they could be working on new things. GCN3 was a major instruction set/machine format update just last year and I still need to adjust some of code for that!

Best Regards.

Ryan(posted 9:51 AM PST)

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sunsetquest
Adept II

Re: AMD GCN4 ISA specification?

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Hello, Will there be any new ISA posted for the vega architecture?  

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bridgman
Staff
Staff

Re: AMD GCN4 ISA specification?

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Yes - an ISA guide for Vega is being worked on. Don't have an ETA yet but it is fairly far along.

sunsetquest
Adept II

Re: AMD GCN4 ISA specification?

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Nice - thanks for the fast reply.  I'll keep an eye out for it.

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giordi91
Adept I

Re: AMD GCN4 ISA specification?

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This is great news!

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