[Joky]

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

[fnl]

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 ...