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0 pointssaagarjha5y ago0 comments

Well, that's only because it's efficient to do so on x86. Code recompiled for ARM isn't going to do that.

0 comments

It’s not that simple if that code is using explicit struct layouts or x86/x64 intrinsics.

Forgive my ignorance though - but what ISA extensions are in Apple’s ARM chips for SIMD? Intel poured a lot of effort into SSE+AXE - Does Apple have a compete there?

saagarjhaOP5y ago

> It’s not that simple if that code is using explicit struct layouts or x86/x64 intrinsics.

Performance sensitive code that relies on alignment guarantees and other platform details will not work and need to be updated, yes. IIRC Apple's chips do NEON for SIMD, not sure if they support SVE yet. (But I figure they will have to once it becomes a required part of the ARM standard…)

Symmetry5y ago

I actually wouldn't be surprised if Apple were to put SVE in their first desktop class ARM chip. They were the first to move to 64 bits after all and SVE has been optional in the standard for quite a while and they wouldn't be the first implementer this time.

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