search for: currreg

...er <arnold.schwaighofer at gmail.com> wrote: > Assuming you use the scavenger in your own code yes. > > A usage could look like: > > for all basic blocks BB: > RS->enter(BB) > for all instructions CurrInst in block order: > if CurrInst has virtual def > CurrReg = RS->scavenge(CurrInst) > replace virtual def by CurReg > else if Insts has virtual use > replace virtual use by CurReg > RS->forward(CurrInst) > > > Look at scavengeFrameVirtualRegs in PrologEpilogInserter.cpp for more > detail (I left out some, error...

...gt; wrote: >> Assuming you use the scavenger in your own code yes. >> >> A usage could look like: >> >> for all basic blocks BB: >> RS->enter(BB) >> for all instructions CurrInst in block order: >> if CurrInst has virtual def >> CurrReg = RS->scavenge(CurrInst) >> replace virtual def by CurReg >> else if Insts has virtual use >> replace virtual use by CurReg >> RS->forward(CurrInst) >> >> >> Look at scavengeFrameVirtualRegs in PrologEpilogInserter.cpp for more &gt...

I'm confused as to the logic used in the register scavenger when it cannot find a free register. I would think that it would want to free up the emergency spill slot immediately after it's use, because otherwise there is a chance of needing to use the emergency slot again and not be able to. Instead it tries to restore it only right before register it is freeing up. Maybe I'm

...use the scavenger in your own code yes. >>> >>> A usage could look like: >>> >>> for all basic blocks BB: >>> RS->enter(BB) >>> for all instructions CurrInst in block order: >>> if CurrInst has virtual def >>> CurrReg = RS->scavenge(CurrInst) >>> replace virtual def by CurReg >>> else if Insts has virtual use >>> replace virtual use by CurReg >>> RS->forward(CurrInst) >>> >>> >>> Look at scavengeFrameVirtualRegs in PrologEpi...