M1 CPU features

[Saagar Jha]

J313 is the codename for the M1 MacBook Air.

Saagar Jha

> On Apr 26, 2021, at 11:56, Georges Martin <jrjsmrtn at gmail.com> wrote:
> 
>> Aha, hw.optional! That's useful, thanks Georges!
> 
> You're welcome :-) You also have:
> 
> 	hw.optional.amx_version: 2
> 	hw.optional.arm64: 1
> 	hw.targettype: J313
> 
> "amx" is the Neural Engine and I think "J313" is the code name for the M1.
> 
> You may find this article very interesting:
> 
> 	https://levelup.gitconnected.com/armv9-what-is-the-big-deal-4528f20f78f3 <https://levelup.gitconnected.com/armv9-what-is-the-big-deal-4528f20f78f3>
> 
> It describes the new ARMv9 instruction set with SVE2 and how it compares to Intel/AMD MMX/SSE/AVX and NEON/SVE.
> 
> Question is: would Apple adopt ARMv9 with SVE2 in a M2 for a future Mac Pro ? ;-)
> 
> G.
> 
>> Le 26 avr. 2021 à 20:44, Jason Liu <jasonliu at umich.edu <mailto:jasonliu at umich.edu>> a écrit :
>> 
>> Aha, hw.optional! That's useful, thanks Georges!
>> 
>> -- 
>> Jason Liu
>> 
>> 
>> On Mon, Apr 26, 2021 at 2:16 PM Georges Martin <jrjsmrtn at gmail.com <mailto:jrjsmrtn at gmail.com>> wrote:
>> $ sysctl hw.optional | grep -E 'neon|armv8'
>> hw.optional.neon: 1
>> hw.optional.neon_hpfp: 1
>> hw.optional.neon_fp16: 1
>> hw.optional.armv8_1_atomics: 1
>> hw.optional.armv8_crc32: 1
>> hw.optional.armv8_2_fhm: 1
>> hw.optional.armv8_2_sha512: 1
>> hw.optional.armv8_2_sha3: 1
>> 
>>> Le 26 avr. 2021 à 19:55, Jason Liu <jasonliu at umich.edu <mailto:jasonliu at umich.edu>> a écrit :
>>> 
>>> On Mon, Apr 26, 2021 at 1:42 PM Christopher Jones <jonesc at hep.phy.cam.ac.uk <mailto:jonesc at hep.phy.cam.ac.uk>> wrote:
>>> Thats not at all surprising as those instruction sets are very much specific to X86_64 systems.
>>> 
>>> RISC processors, Arm, do have their own sets of SIMD instructions (e.g. Neon), but they are entirely different to those on X86_64 machines. 
>>> 
>>> Whether or these are supported on Apple’s M1 processors I have no idea.
>>> 
>>> It looks like the M1 supports Neon SIMD instructions, but not SVE SIMD (which I guess is supposed to be similar to AVX?):
>>> 
>>> https://discussions.apple.com/thread/252073619 <https://discussions.apple.com/thread/252073619>
>>> 
>>> -- 
>>> Jason Liu
>>> 
>>> 
>>> On Mon, Apr 26, 2021 at 1:42 PM Christopher Jones <jonesc at hep.phy.cam.ac.uk <mailto:jonesc at hep.phy.cam.ac.uk>> wrote:
>>> 
>>> 
>>>> On 26 Apr 2021, at 6:28 pm, Jason Liu <jasonliu at umich.edu <mailto:jasonliu at umich.edu>> wrote:
>>>> 
>>>> Thanks Arno :)
>>>> 
>>>> I'm kind of surprised that the M1 doesn't seem to support any SSE or AVX....
>>> 
>>> 
>>> Thats not at all surprising as those instruction sets are very much specific to X86_64 systems.
>>> 
>>> RISC processors, Arm, do have their own sets of SIMD instructions (e.g. Neon), but they are entirely different to those on X86_64 machines. 
>>> 
>>> Whether or these are supported on Apple’s M1 processors I have no idea.
>>> 
>>> Chris
>>> 
>>> 
>>> 
>>>> 
>>>> Does "sysctl machdep.cpu.features" return anything?
>>>> 
>>>> -- 
>>>> Jason Liu
>>>> 
>>>> 
>>>> On Mon, Apr 26, 2021 at 1:23 PM Arno Hautala <arno at alum.wpi.edu <mailto:arno at alum.wpi.edu>> wrote:
>>>> > On 26 Apr 2021, at 13:20, Jason Liu <jasonliu at umich.edu <mailto:jasonliu at umich.edu>> wrote:
>>>> > 
>>>> > sysctl machdep.cpu.brand_string ; sysctl machdep.cpu | grep -i "avx\|sse”
>>>> 
>>>> $ sysctl machdep.cpu.brand_string ; sysctl machdep.cpu | grep -i "avx\|sse”
>>>> machdep.cpu.brand_string: Apple M1
>>>> 
>>>> -- 
>>>> arno  s  hautala    /-|   arno at alum.wpi.edu <mailto:arno at alum.wpi.edu>
>>>> 
>>>> pgp b2c9d448
>>>> 
>>>> 
>>> 
>> 
> 

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