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On Jan 19, 2012, at 5:31 AM, Jonas Paulsson wrote: > LLVM would have to be extended with an RegClass/register-attribute 'spillable' What exactly are you proposing? Why can't you do what the PowerPC and Hexagon targets do? Spill-free register allocation sounds great, why not do it for all register classes? > , and a register allocator would have to implement register pairing.

Hi, My target has special requirements during register allocation - there is both a need to handle register pairing and to never spill a flag result reg-class (which might happen at -O0 for no obvious reason). Since neither of these issues seems to be supported, I have tried to pre-allocate these registers in the preRA pass. This has resulted in "using undefined physical register"

...time. Has anything changed since then? What is your estimation on the amount of work for this? Would anyone (Lang?) be willing to supervise it? Jonas -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120120/1168d75f/attachment.html>