By: Ronald Maas (rmaas.delete@this.wiwo.nl), February 4, 2015 7:42 pm
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on February 4, 2015 11:42 am wrote:
> You don't think they'll at least add the ARMv8.1 RMW atomics? (Not that that changes performance
> substantially, but I imagine they want that part of the ISA to be universalized ASAP.)
>
>
No I do not think so.
All cores used in a big-little configuration must be on the exact same architectural level, either ARMv7, ARMv8 or ARMv8.1. Because A72 are designed to be paired with A53, this implies A72 can never support the ARMv8.1 programming model.
Of cause it is possible that the a A72 chip will implement ARMv8.1, but initially disabled until the little cores start to support ARMv8.1. If that is the case, then I really hope that ARM's marketing department is wise enough to allocate a new model number for ARMv8.1 compatible cores. Otherwise 'Cortex-A72 with ARMv8.1 Feature Set' is such a mouth full.
Ronald
> You don't think they'll at least add the ARMv8.1 RMW atomics? (Not that that changes performance
> substantially, but I imagine they want that part of the ISA to be universalized ASAP.)
>
>
No I do not think so.
All cores used in a big-little configuration must be on the exact same architectural level, either ARMv7, ARMv8 or ARMv8.1. Because A72 are designed to be paired with A53, this implies A72 can never support the ARMv8.1 programming model.
Of cause it is possible that the a A72 chip will implement ARMv8.1, but initially disabled until the little cores start to support ARMv8.1. If that is the case, then I really hope that ARM's marketing department is wise enough to allocate a new model number for ARMv8.1 compatible cores. Otherwise 'Cortex-A72 with ARMv8.1 Feature Set' is such a mouth full.
Ronald
| Topic | Posted By | Date |
|---|---|---|
| ARM announces A72 | Maynard Handley | 2015/02/03 12:36 PM |
| ARM announces A72 | anon | 2015/02/03 01:53 PM |
| ARM announces A72 | Hugo DĂ©charnes | 2015/02/03 02:20 PM |
| ARM announces A72 | juanrga | 2015/02/03 05:15 PM |
| ARM announces A72 | Wilco | 2015/02/04 01:58 AM |
| ARM announces A72 | Eric Bron | 2015/02/04 02:48 AM |
| ARM announces A72 | none | 2015/02/04 03:24 AM |
| ARM announces A72 | Eric Bron | 2015/02/04 03:42 AM |
| ARM announces A72 | Exophase | 2015/02/04 08:01 AM |
| ARM announces A72 | Anon | 2015/02/04 08:35 AM |
| ARM announces A72 | Exophase | 2015/02/04 08:58 AM |
| ARM announces A72 | Groo | 2015/02/04 10:24 AM |
| ARM Marketing, BS up to my ears | David Kanter | 2015/02/04 11:51 AM |
| ARM Marketing, BS up to my ears | Maynard Handley | 2015/02/04 02:59 PM |
| ARM Marketing, BS up to my ears | David Kanter | 2015/02/04 03:21 PM |
| ARM Marketing, BS up to my ears | Groo | 2015/02/04 03:30 PM |
| ARM announces A72 | juanrga | 2015/02/04 05:23 AM |
| ARM announces A72 | Wilco | 2015/02/04 04:01 PM |
| ARM announces A72 | juanrga | 2015/02/04 05:06 PM |
| ARM announces A72 | Anon | 2015/02/04 02:28 AM |
| ARM announces A72 | juanrga | 2015/02/04 05:31 AM |
| ARM announces A72 | Aaron Spink | 2015/02/04 07:49 AM |
| ARM announces A72 | Ronald Maas | 2015/02/03 08:23 PM |
| ARM announces A72 | Seni | 2015/02/04 01:19 AM |
| ARM announces A72 | Maynard Handley | 2015/02/04 11:42 AM |
| ARM announces A72 | Seni | 2015/02/04 01:33 PM |
| ARM announces A72 | dmcq | 2015/02/04 01:57 PM |
| ARM announces A72 | Ronald Maas | 2015/02/04 07:42 PM |
| ARM announces A72 | anon | 2015/02/04 06:19 AM |
| ARM announces A72 | Exophase | 2015/02/04 08:31 AM |
| ARM announces A72 | David Kanter | 2015/02/04 11:25 AM |
| ARM announces A72 | Exophase | 2015/02/04 02:33 PM |
| ARM announces A72 | anon | 2015/02/04 11:27 PM |
| ARM announces A72 (fixed format) | anon | 2015/02/04 11:29 PM |
| ARM announces A72 | Exophase | 2015/02/05 12:11 AM |
| ARM announces A72 | anon | 2015/02/05 01:02 AM |
| ARM announces A72 | anon | 2015/02/04 06:57 PM |
| ARM announces A72 | Wilco | 2015/02/03 02:39 PM |
| ARM announces A72 | Maynard Handley | 2015/02/03 03:13 PM |
| ARM announces A72 | anon | 2015/02/03 03:29 PM |
| ARM announces A72 | Wilco | 2015/02/03 03:44 PM |
| ARM announces A72 | David Kanter | 2015/02/04 10:56 AM |
| ARM announces A72 | Peter Greenhalgh | 2015/02/04 11:56 AM |
| ARM announces A72 | Aaron Spink | 2015/02/04 12:59 PM |
| ARM announces A72 | Alberto | 2015/02/07 11:22 AM |
| ARM announces A72 | Exophase | 2015/02/07 11:47 AM |
| ARM announces A72 | Alberto | 2015/02/07 01:44 PM |
| ARM announces A72 | Exophase | 2015/02/07 03:35 PM |
| ARM announces A72 | Alberto | 2015/02/08 02:09 AM |
| ARM announces A72 | Exophase | 2015/02/08 12:05 PM |
| ARM announces A72 | David Kanter | 2015/02/08 01:39 AM |
| ARM announces A72 | dmcq | 2015/02/08 05:14 AM |
| ARM announces A72 | Michael S | 2015/02/08 05:38 AM |
| ARM announces A72 | Gabriele Svelto | 2015/02/10 06:11 AM |
| ARM announces A72 | Jouni Osmala | 2015/02/10 12:24 PM |
| slit vs unified | Michael S | 2015/02/10 02:57 PM |
| slit vs unified | dmcq | 2015/02/11 06:44 AM |
| ARM announces A72 | Doug S | 2015/02/08 10:00 AM |
| ARM announces A72 | Exophase | 2015/02/08 11:57 AM |
| ARM announces A72 | dmcq | 2015/02/04 02:10 PM |
| ARM announces A72 | David Kanter | 2015/02/04 03:28 PM |
| ARM announces A72 | Wilco | 2015/02/04 02:59 PM |
| ARM announces A72 | Aaron Spink | 2015/02/04 10:31 PM |
| Intel 32nm vs 14 nm | Michael S | 2015/02/05 02:03 AM |
| Intel 32nm vs 14 nm | Wilco | 2015/02/05 03:27 AM |
| Intel 32nm vs 14 nm | David Kanter | 2015/02/05 10:05 AM |
| Intel 32nm vs 14 nm | carop | 2015/02/05 12:12 PM |
| Normalize to drawn or effective width? | David Kanter | 2015/02/05 12:45 PM |
| Normalize to drawn or effective width? | carop | 2015/02/05 03:40 PM |
| Normalize to drawn or effective width? | David Kanter | 2015/02/06 01:44 PM |