Question Zen 6 Speculation Thread

[511]

They did!
But a lot of times, you gotta compromise.

Well it's kind of needed cause there are absolutely some stuff that can make use of extra GPR and the new instructions

 

[adroc_thurston]

Well it's kind of needed cause there are absolutely some stuff that can make use of extra GPR and the new instructions

Not the problem.

 

[511]

Not the problem.

Than what's the problem ?

 

[adroc_thurston]

Than what's the problem ?

It's not a clean ISA break like aa64 was.
A stupid half-measure no one really asked for.

 

[511]

It's not a clean ISA break like aa64 was.
A stupid half-measure no one really asked for.

X86_64 sells in the name of compatibility and they probably decided Compatibility is more important for them.

 

[adroc_thurston]

X86_64 sells in the name of compatibility and they probably decided Compatibility is more important for them.

You're not forced to remove amd64! APX is already incompatible anyway from compiler POV.
ffs stop with this stupid garbage. aa32 did not die to aa64.

 

[Nothingness]

Well this is primarily down to Atom guys being really really annoying about it.

IIRC during that period Intel castrated some Core CPU with AVX2 removed.

 

[511]

You're not forced to remove amd64! APX is already incompatible anyway from compiler POV.
ffs stop with this stupid garbage. aa32 did not die to aa64.

APX is a ABI Extension not a clean break like AA64 was over AA32

 

[adroc_thurston]

IIRC during that period Intel castrated some Core CPU with AVX2 removed.

AVX512 but yes.

APX is a ABI Extension not a clean break like AA64 was over AA32

THAT.
IS. THE.
P R O B L E M.
32 arch GPRs and a new prefix already smash compiler assumptions so there was no reason to not do a clean ISA break with a separate exec mode. Alas, Intel is a thing.

 

[511]

THAT.
IS. THE.
P R O B L E M.
32 arch GPRs and a new prefix already smash compiler assumptions so there was no reason to not do a clean ISA break with a separate exec mode. Alas, Intel is a thing.

AMD did the same thing with AMD64 16 GPR

 

[adroc_thurston]

AMD did the same thing with AMD64 16 GPR

Yes and brought a bunch of issues down the line.
Again, aa64 did it well. They copied the whatever parts of aa64 and not the good stuff.

 

[CouncilorIrissa]

AVX512 but yes.

Haswell/Skylake Pentiums lacked AVX2 though.

 

[adroc_thurston]

Haswell/Skylake Pentiums lacked AVX2 though.

Skylake is almost 11 years old, though.
That's ancient history.

 

[LightningZ71]

AVX-512 was supposed to be mainstreamed but ala 10nm happened.

Cough cough Rocket lake cough cough

 

[regen1]

Haswell/Skylake Pentiums lacked AVX2 though.

Yeah, wasn't until Tiger Lake on notebooks and Alder Lake on desktop that 'Pentium' and 'Celeron' branded big "Core" SKUs got up to AVX2.
Technically Rocket Lake didn't have such segmentation but it also didn't have low end SKUs (Pentium, Celeron).