Of possible interest: fast UTF8 validation

[Ethan Watson]

On Wednesday, 16 May 2018 at 13:54:05 UTC, Andrei Alexandrescu 
wrote:
> Is it workable to have a runtime-initialized flag that controls 
> using SSE vs. conservative?

Sure, it's workable with these kind of speed gains. Although the 
conservative code path ends up being slightly worse off - an 
extra fetch, compare and branch get introduced.

My preferred method though is to just build multiple sets of 
binaries as DLLs/SOs/DYNLIBs, then load in the correct libraries 
dependant on the CPUID test at program initialisation. Current 
Xbox/Playstation hardware is pretty terrible when it comes to 
branching, so compiling with minimal branching and deploying the 
exact binaries for the hardware capabilities is the way I 
generally approach things.

We never got around to setting something like that up for the PC 
release of Quantum Break, although we definitely talked about it.