search for: islegaltocoalesc

...ce should be made by the + /// coalescer. + virtual bool okToCoalesce(const MachineInstr &inst) const { + return(true); + } I think we discussed this early but please remind me. Why is this necessary? Why isn't interfere() sufficient test? Also, I would prefer a name like isLegalToCoalesce over okToCoalesce. 4. Is it necessary to separate class InterferenceData out from RegisterCoalescer.h? 5. + /// Run the coalescer on this function, providing interference + /// data to query. Return whether we removed any copies. + virtual bool coalesceFunction(MachineFunction &m...

.../// coalescer. > + virtual bool okToCoalesce(const MachineInstr &inst) const { > + return(true); > + } > > I think we discussed this early but please remind me. Why is this > necessary? Why isn't interfere() sufficient test? Also, I would prefer > a name like isLegalToCoalesce over okToCoalesce. interfere() isn't sufficient because the allocation algorithm may place other constraints on coalescing. George and Appel's iterated register coalescing is a prime example. It wants to "freeze" copies that should not be coalesced because doing so might cause...

Here's a proposed patch for reworking register coalescing to allow pluggable coalescers. I think I've got the interfaces where I want them and am reasonably sure I've squashed most of the bugs. I'm still doing some testing and want to get through a whole regimen before committing. As a reminder, this patch has several goals: - Allow user-specified register coalescers, similar

...ol okToCoalesce(const MachineInstr &inst) const { >> + return(true); >> + } >> >> I think we discussed this early but please remind me. Why is this >> necessary? Why isn't interfere() sufficient test? Also, I would >> prefer >> a name like isLegalToCoalesce over okToCoalesce. > > interfere() isn't sufficient because the allocation algorithm may > place other > constraints on coalescing. George and Appel's iterated register > coalescing > is a prime example. It wants to "freeze" copies that should not be &gt...