On Mon, Jun 07, 2021 at 08:27:12AM -0700, Paul E. McKenney wrote: > > > > > The barrier() thing can work - all we need to do is to simply make it > > > > > impossible for gcc to validly create anything but a conditional > > > > > branch. > > > What would you suggest as a way of instructing the compiler to emit the > > > conditional branch that we are looking for? > > > > You write it in the assembler code. > > > > Yes, it sucks. But it is the only way to get a branch if you really > > want one. Now, you do not really need one here anyway, so there may be > > some other way to satisfy the actual requirements. > > Hmmm... What do you see Peter asking for that is different than what > I am asking for? ;-) I don't know what you are referring to, sorry? I know what you asked for: literally some way to tell the compiler to emit a conditional branch. If that is what you want, the only way to make sure that is what you get is by writing exactly that in assembler. Segher
