Enable sse2/avx2 if available

[mulimoen]

No description provided.

[mulimoen]

@LDeakin Does this PR work for you in getting the intrinsics version of shuffles? This requires RUSTFLAGS=-C target-feature=+avx2,+sse2 and will not be set automatically as it would in CMake

[LDeakin]

Yes, that does the trick! Although, I don't even need to set RUSTFLAGS=-C target-feature=+avx2,+sse2.

[LDeakin]

Update: with RUSTFLAGS="-C target-feature=+avx2,+sse2", I get a crash. This does not occur on the main branch, so this seems like an issue with blosc-c.

[mulimoen]

Yeah, I see the crash when using avx2, I will fix this

[LDeakin]

You probably need these compile flags https://github.com/Blosc/c-blosc/blob/bdbb700787a2485a756eea63ced268f9a00f6370/blosc/CMakeLists.txt#L157-L192

[mulimoen]

Need to pass these flags to cc as this is not done automatically, rust-lang/cc-rs#268. I'll see what I can do tomorrow

[LDeakin]

3290ebd works and I've tested it with a suite of external benchmarks, LGTM.

[mulimoen]

Thanks for picking up that this crate did not use SSE2/AVX @LDeakin. I will release a new version later today

[LDeakin]

No worries, thanks for addressing it so quickly!