Re:Intel i7 loop performance anomaly (2013)
by exikyut on Saturday December 16, 2017 @12:55AM
(#15938016)
> It's a reasonably rare case where it makes a big difference, but it almost never hurts, and frequently is a small positive. Who would I need to convince to change this? What sort of benchmark would they need as motivation? Would pointing to Intel documentation possibly be sufficient?
From someone completely naive on the compiler scene, I think I can safely say that
- A benchmark with better results than it should have (ie, savings on the order of whole seconds) would obviously grab and keep attention
- For finding out who to pester and/or what everyone thinks of the subject, #gcc is big-ish, #llvm is a bit smaller, and #clang is smaller still, all on freenode - presumably low activity (as seems the norm nowadays) and type-and-wait, but a lighter-weight (for want of a better term) alternative than the mailinglists. Ultimately I expect you'll end up posting to a list somewhere, but IRC sounds like a good way to get oriented first
- My strong guess is that LLVM and GCC already have fairly heavily ingrained internal architecture/structure, and yeah, some convincing would be needed.
From someone completely naive on the compiler scene, I think I can safely say that
- A benchmark with better results than it should have (ie, savings on the order of whole seconds) would obviously grab and keep attention
- For finding out who to pester and/or what everyone thinks of the subject, #gcc is big-ish, #llvm is a bit smaller, and #clang is smaller still, all on freenode - presumably low activity (as seems the norm nowadays) and type-and-wait, but a lighter-weight (for want of a better term) alternative than the mailinglists. Ultimately I expect you'll end up posting to a list somewhere, but IRC sounds like a good way to get oriented first
- My strong guess is that LLVM and GCC already have fairly heavily ingrained internal architecture/structure, and yeah, some convincing would be needed.
- I have no idea how to get in touch with people associated with LKML off-LKML, but they seem to have opinions about generated code quality too: https://lkml.org/lkml/2017/11/10/310 (focusing on reply at bottom, not quote; linked in https://news.ycombinator.com/item?id=15849305, from https://news.ycombinator.com/item?id=15845118)