search for: virtual_regist

...register. The lifetimes of those 'some_register' is likely to be very small (1 instruction), so "reserving" it everywhere is not good. Ideal approach would be to add a method to MRegisterInfo to spill specific virtual register. The implementation can then create code like: virtual_register = frame_pointer + offset [virtual_register] and then have 'virtual_register' allocated on next iteration of register allocator? Also, while RegAllocLocal and RegAllocSimple directly call storeRegToStackSlot, I would not found any calls to that method in RegAllocLinearScan. Am I...

...of those 'some_register' is likely to be very small (1 > instruction), so "reserving" it everywhere is not good. > > Ideal approach would be to add a method to MRegisterInfo to spill specific > virtual register. The implementation can then create code like: > > virtual_register = frame_pointer + offset > [virtual_register] > > and then have 'virtual_register' allocated on next iteration of register > allocator? This is one approach. Another approach is to have to spiller scavange registers, which is the subject of this enhancement request:...

Chris Lattner wrote: >> and then have 'virtual_register' allocated on next iteration of register >> allocator? > > This is one approach. Another approach is to have to spiller scavange > registers, which is the subject of this enhancement request: > http://llvm.org/PR768 Can you given some references for this "scavange&qu...