On Donnerstag, 11. Januar 2018 20:37:55 CET Schulz, Roland wrote: > I would like to do something like: [...] +1 > I would like to use width to do manual strip-mining or instantiate SIMD C++ > templates. The problem is that this doesn't compile because > __builtin_cpu_supports isn't constexpr. For every clone of foo, the > compiler knows the SIMD support at compile time. I'm looking for a builtin > which lets me query that in a constexpr way. AFAIK there is nothing (I'd be happy to be proven wrong). I also can't think of any hack that would produce the value as a constant expression. (I tried `using v64 [[gnu::vector_size(64)]] = float; alignof(v64)`, but its alignment is 64, independent of the register size it uses.) Cheers, Matthias -- ────────────────────────────────────────────────────────────────────────── Dr. Matthias Kretz GSI Helmholtzzentrum für Schwerionenforschung https://gsi.de SIMD easy and portable https://github.com/VcDevel/Vc ──────────────────────────────────────────────────────────────────────────
