Talk:IBM A2

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PowerPC vs. Power ISA

As the A2 implements the Power ISA, as mentioned in the article, it is backward compatible with PowerPC code but it is not a PowerPC processor. Unless somebody finds an IBM document to the contrary, I propose to move this article to IBM A2. --EnOreg (talk) 15:12, 17 November 2016 (UTC)[reply]

This document regarding development for the BlueGene/Q (consisting of numerous A2 cores) refers the th eprocessor as "PowerPC". http://www.redbooks.ibm.com/redbooks/pdfs/sg247948.pdf

For example, from the Blue Gene/Qhardware overview:

"Compute cards contain 16 IBM Blue Gene/Q PowerPC® A2 core processors and 16 GB of memory."

For example, from the intro to Chapter 7:

"This chapter describes the considerations for developing, compiling, and optimizing C/C++ and Fortran applications for the IBM Blue Gene/Q PowerPC A2 processor and the quad-processing extension (QPX) in the PowerPC AS v2 floating-point unit."

-- Henriok (talk) 14:13, 19 November 2016 (UTC)[reply]

Thanks much, Henriok, for this competent reply. IBM's terminology here is very confusing. But you've convinced me: It is a PowerPC.

That wouldn't be the first time :) Some use PowerPC, POWER and Power interchangeably, but incorrect. It's a nuisance. The writers probably use the term that's most familiar to them, and not really seeing the larger picture, and frankly.. technologically, it's no biggie. It's all pretty much the same.-- Henriok (talk) 08:42, 30 November 2016 (UTC)[reply]

As the A2 user's manual hardly mentions the term and the IBM documents I found mostly refer to it simply as A2, I still think IBM A2 would be a better lemma. PowerPC does not appear to be part of the "official" product name. Thoughts? --EnOreg (talk) 17:25, 29 November 2016 (UTC)[reply]

I can support that. Technically it's a "Power ISA" processor, so your document is very correct, but I can easily find contemporary documentation for BlueGeneQs and PowerEN processors that only use "PowerPC".. I guess it was a PPC during development, and then marketing changed the term. -- Henriok (talk) 08:42, 30 November 2016 (UTC)[reply]

OK, thanks. I've made the change. --EnOreg (talk) 13:27, 11 January 2017 (UTC)[reply]

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Open source section

says that both A2O and A2I are written in VHDL. A2O is in verilog. https://github.com/openpower-cores/a2o/tree/master/rel/src/verilog/work also perhaps worth mentioning somewhere about the A2I using VHDL to design at near gate-level rather than as a High-level design, to guarantee high performance. example: https://github.com/openpower-cores/a2i/blob/master/rel/src/vhdl/work/fuq_alg_sh16.vhdl — Preceding unsigned comment added by Lkcl (talk • contribs) 19:27, 5 May 2021 (UTC)[reply]

Amended regarding A2O and Verilog -- Henriok (talk) 11:19, 6 May 2021 (UTC)[reply]