in order to make ruby faster, I'd like to propose an optional SIMD optimization for some cases. I want to target SSE2 which is available in all modern x86 processors. (Pentium 4, Athlon 64 and newer).
this is usually automatically handled by GCC during compilation time, but because of dynamic nature of ruby, redefinitions etc. It's very hard to preoptimize it before the actual execution.
use auto-vectorization provided by JIT ( https://bugs.ruby-lang.org/issues/12589 )¶
GCC can do that, but I'm not sure how reliable and effective it is today Pros: we don't have to do anything, let GCC do the job bigger scope for optimizations Cons: slower compilation
- gcc docs:
pypy has this feature implemented for some time now:
specialize known bottlenecks by hand¶
Pros: predictable performace without increased compilation time Cons: code complexity
unfortunatelly using SIMD isn't for free, there's an overhead, it needs a large data set to be effective. It's useful mainly for math operations, sum, min, max, arrays, matrixes, string manipulations etc. There probably won't be any significant benefit for appliactions like Rails.
what do you think about it?