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Uh, what you're pointing at was introduced in 2012 in LLVM.

Only in parts, not all instructions, and some functionality it did have was buggy. 4 and 5 are much more advanced/competitive on SIMD issues, it seems.

Edit: Oh, sorry you meant that other guy's link to LLVM's vectorization tutorial. Ignore my reply ...

Oh, cool, I see LLVM now even sports (basically all of) SSE4.2 and AVX-512. As always, that project amazes... :-)

Do you mean LLVM 5?

Yes, indeed even LLVM 4 already improved its AVX-512 support.

http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html

Really impressive how many new things came to LLVM this year!