alt Hacker Newsauto-vectorization is not nearly as good as you would hope it to be.
The best SIMD optimizations likely require changing your data format from AoS to SoA.
Replies
ethin • today at 7:45 PM
Either this or you have to do special tricks like pairwise tree reductions and hand-unroll certain portions of loops.
formerly_proven • today at 7:30 PM
And -march=native or at least -march=x86-64-v3 or similar, alternatively identifying relevant functions and manually invoking FMV and uarch specialization via target_clones. Plus non-integer code can generally not be autovectorized in normal-math mode since FP is non-commutative.
Joker_vD • today at 7:34 PM
Well, then I just prompt Claude and get SIMD without having to learn it /s
The one feature in Jonathan Blow's Jai language I really envy is a a single keyword to switch AoS to SoA and visa-versa at comptime