On Wed, Nov 25, 2020 at 06:44:52PM +0000, NonNull via Digitalmars-d-learn wrote: > For automatically generated code of some low level kinds it is > convenient to have "computed goto" like this: > > https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html > > and D does not have this. > > A switch could be used to simulate it. But this would lead to what > could have been a single jump being chained jumps.
FWIW, D's switch statement is flexible enough to directly write Duff's device. > How good is optimization in ldc2, gdc, dmd at compiling chained jumps > into one jump each time? I'm pretty sure ldc2 and gdc will optimize away any such chained jumps. But if performance is important to you, I recommend *not* bothering with dmd. > Is there a good way to simulate computed goto in D? With a switch statement. ;) T -- They pretend to pay us, and we pretend to work. -- Russian saying
