On Fri, Feb 05, 2021 at 10:09:26AM -0500, Mathieu Desnoyers wrote: > Then we should be able to generate the following using static keys as a > jump table and N static calls: > > jump <static key label target> > label_N: > stack setup > call > label_N-1: > stack setup > call > label_N-2: > stack setup > call > ... > label_0: > jump end > label_fallback: > <iteration and indirect calls> > end: > > So the static keys would be used to jump to the appropriate label (using > a static branch, which has pretty much 0 overhead). Static calls would > be used to implement each of the calls. > > Thoughts ? At some point I tried to extend the static_branch infra to do multiple targets and while the low level plumbing is trivial, I ran into trouble trying to get a sane C level API for it.
