Discussion Future ARM Cortex + Neoverse µArchs Discussion

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soresu

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Dec 19, 2014
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Interesting that ARM just posted an article about SME as if it was only just introduced instead of years old now:


Perhaps there is some possibility that it is in a near term roadmapped CPU core for Cortex or Neoverse.
 
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poke01

Golden Member
Mar 8, 2022
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Interesting that ARM just posted an article about SME as if it was only just introduced instead of years old now:


Perhaps there is some possibility that it is in a neartime roadmapped CPU core for Cortex or Neoverse.
This just further proves that Apple has plans to use their M4 Ultra chips in their servers later. They are using M2 Ultras now but as demand grows it’s clear why M4 added SME now.

Hopefully MediaTek enables SME on the X5.
 

soresu

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Dec 19, 2014
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Hopefully MediaTek enables SME on the X5.
Doubtful.

I said near term, but by that I meant the next 3-5 years, not X5/2024 IP.

Possibly on the V4 based on X5, but I wouldn't bet anything significant on it.
 

poke01

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Mar 8, 2022
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Doubtful.

I said near term, but by that I meant the next 3-5 years, not X5/2024 IP.

Possibly on the V4 based on X5, but I wouldn't bet anything significant on it.
Then don’t you think it’s kinda strange that ARM is hyping up SME now when no will enable this year then.

It’s not a good for ARM. Let’s write articles but wait none of the high volume CPUs will enable SME…
 

soresu

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Dec 19, 2014
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Then don’t you think it’s kinda strange that ARM is hyping up SME now when no will enable this year then.
As you say it may just be ARM giving Mac devs a hand dipping their toes in to it now it's finally got hardware shipping.
 
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Doug S

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Feb 8, 2020
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Interesting that ARM just posted an article about SME as if it was only just introduced instead of years old now:

Probably because of the attention M4 brought to it, so ARM wants the world to know it is their thing not something unique to Apple. Also because they want to hype it to have something to do with "AI" to get some of that Nvidia style stock market love!

It went up by 9% today and nearly 14% in the last five days, so maybe it worked...
 
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Nothingness

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Jul 3, 2013
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Then don’t you think it’s kinda strange that ARM is hyping up SME now when no will enable this year then.

It’s not a good for ARM. Let’s write articles but wait none of the high volume CPUs will enable SME…
All companies that develop ISA do publish specifications long in advance to get the community ready. Arm has been doing that for many years, at least since the introduction of ARMv8. Intel is also doing the same.
 

hemedans

Senior member
Jan 31, 2015
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That has 0 to do with the A520s they still use and everything to do with the 5 A720’s they scale.
8 gen 3 is vice versa at heavy load it use more power and low load battery life can rival even iphone.

Site like Gsmarena they do measure these low load test like video streaming and browsing and 8 gen 3 is better than all previous Android flagship.
 

FlameTail

Diamond Member
Dec 15, 2021
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8 gen 3 is vice versa at heavy load it use more power and low load battery life can rival even iphone.

Site like Gsmarena they do measure these low load test like video streaming and browsing and 8 gen 3 is better than all previous Android flagship.
Android phones typically have larger batteries than iPhones
 
Jul 27, 2020
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It’s not a good for ARM. Let’s write articles but wait none of the high volume CPUs will enable SME…
Once WoA takes off, we should see workstation laptops with beefier cooling and more powerful CPUs with more cores and SME will make sense in those CPUs.

I hate to admit it but I can now see a future where the world gradually moves away from x86-64 until the latter dies sadly or both co-exist in harmonious equilibrium. But if Microsoft doesn't develop an emulation layer for native ARM WoA binaries to run on x86-64 CPUs, that might accelerate the latter's death.
 

hemedans

Senior member
Jan 31, 2015
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Android phones typically have larger batteries than iPhones
True and iPhone has low resolution. But in past even with large batteries Android flagship couldn't match iPhone onscreen tests especially browsing, but things are different with 8 gen 3.
 

FlameTail

Diamond Member
Dec 15, 2021
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Windows x86 Games that use AVX2 (256 bit vector) do not work on current ARM CPUs even through emulation. This is evidently because ARM CPUs lack 256 bit SIMD vector pipelines.

Will the addition of SVE2 extension solve this problem? What about Streaming SVE?
 

SarahKerrigan

Senior member
Oct 12, 2014
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Windows x86 Games that use AVX2 (256 bit vector) do not work on current ARM CPUs even through emulation. This is evidently because ARM CPUs lack 256 bit SIMD vector pipelines.

Basis for the second statement? You can absolutely break 256b ops into multiple 128b ops (though permute and reduction ops get a bit awkward.)
 

Nothingness

Platinum Member
Jul 3, 2013
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Windows x86 Games that use AVX2 (256 bit vector) do not work on current ARM CPUs even through emulation. This is evidently because ARM CPUs lack 256 bit SIMD vector pipelines.
I think Sarah answered this. I only will add that NEON has twice the number of registers, enough for the 16 AVX2 registers. Though that leaves you with no room for temporaries which might create complications, though nothing really blocking.

Will the addition of SVE2 extension solve this problem? What about Streaming SVE?
SVE2 is already there. It's unrelated with vector length.
 
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