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...l is not 42) // The store is "guarded" by an inf loop > > > We can't reorder the store to ptr_a to before the infinite loop. The > volatile store is there to make the infinite loop well defined. These do not have hidden control flow. It is actually well defined it just literallly involves other instructions :) Note that gcc will optionally connect the infinite loop itself to the exit block with a fake edge if you want (you can add/remove fake edges on a per-opt basis). > > > > Or did you mean something else? > > > > Both of these are optim...

On Fri, Jul 15, 2016 at 2:30 PM, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > Hi Daniel, > > Daniel Berlin wrote: > > However, I didn't quite understand your point about may-throw -- how > > is may-throw different from a generic side-effect (volatile store, > > syscall etc.)? All of those can't be hoisted or sunk -- we have to >