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...ons: bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) { ... // perform a final pass over the instructions and compute spill // weights, coalesce virtual registers and remove identity moves but the data structure LiveVariables::VirtRegInfo is _not_ updated. That is, VarInfo::DefInstr may point to an invalid (being coalesced) instruction. -- Tzu-Chien Chiu, 3D Graphics Hardware Architect <URL:http://www.csie.nctu.edu.tw/~jwchiu>

...nMachineFunction(MachineFunction &fn) { > ... > // perform a final pass over the instructions and compute spill > // weights, coalesce virtual registers and remove identity moves > > but the data structure LiveVariables::VirtRegInfo is _not_ updated. > That is, VarInfo::DefInstr may point to an invalid (being coalesced) > instruction. We could potentially remove those VirtRegInfos for the registers we coalesce. But since after coalescing there are no instructions refering to those coalesced registers, it is logical that noone will ever query the liveness of those regis...

I overrode getInstrLatency and did some printing to see what is available there. It looks like the registers are still virtual at that point when getInstrLatency is called - is that correct? (we needed to make some decisions based on actual registers that have been assigned since some registers are reserved as address space pointers and we could vary the latency based on which address space