[PATCH] D53927: [AArch64] Enable libm vectorized functions via SLEEF

[Stefan Teleman via Phabricator via llvm-commits]

steleman added a comment.

In D53927#1327091 <https://reviews.llvm.org/D53927#1327091>, @rengolin wrote:

> > Which means that those environments who will want to use SLEEF will have to build their own.
> >  The upside is that SLEEF is likely of interest only to the rarefied world of HPC/Super-computing. Those environments can definitely build their own SLEEF and maintain their own binary copy.
>
> The signal I'm getting from all labs (in US, Europe and Asia) is that they really *don't* want to maintain their own binaries. They just cope with it because we don't do a good job at the tools/packaging level.
>
> I'm not willing to add more chaos into the mix.


Then they are in trouble with a hypothetical distro SLEEF.

That's because no commercial distro - if they ever decide to include SLEEF - will compile SLEEF for the maximum CPU feature-set possible. They do the exact opposite - they compile it for the lowest possible common denominator.

For example, on AArch64, you won't get distro libraries compiled specifically for -mcpu=thunderx2t99. Or on x86_64 you'll never get -mavx512ifma, for example.


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https://reviews.llvm.org/D53927