I once used it to get a 4x speedup of sqrt computations, by using SIMD. It was quite fun, and also quite self contained and manageable. The library sqrt handle

I once used it to get a 4x speedup of sqrt computations, by using SIMD. It was quite fun, and also quite self contained and manageable. The library sqrt handles all kinds of edge-cases which prevent the compiler from autovectorizing it.