n-body performance degradation from 1.7 to 1.8

[llogiq]

Isaac noted this on a rust-users' thread.

14.600s rustc 1.7.0
24.533s rustc 1.8.0

Someone should look into this.

[TeXitoi]

It must be llvm that doesn't auto simd the code.

[crumblingstatue]

Isn't it possible it regressed because of rust-lang/rust#31545?

[TeXitoi]

I don't think do, but that's a possibility.

[mati865]

Guess this issue doesn't matter anymore after #70?

[TeXitoi]

Yep, thanks for the reminder.