[llvm-dev] Post SSA, not tracking liveness
Quentin Colombet via llvm-dev
llvm-dev at lists.llvm.org
Mon May 16 13:47:54 PDT 2016
> On May 16, 2016, at 1:26 PM, Lawrence, Peter via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> With “-print-machineinstrs” I’m seeing this message
> # Machine code for function main: Post SSA, not tracking liveness”
> But I see “<kill>”, and “<dead>”, info in the printout,
> The question is, does “not tracking liveness” mean this info is invalid / out-of-date ???
This specific info is valid no matter what (or it is a bug).
What this means is that the LiveIntervalAnalysis is not correct anymore (must be recomputed).
> If so, what do I do to ensure that it is valid ???
> I ask because I’m writing a post-RA MachineFunctionPass that requires this info.
What kind of information do you need specifically?
> Or to put it another way,
> If the info is invalid why are we printing it out ?
> Otherwise if the info is valid what does “not tracking liveness” mean ?
> --Peter Lawrence.
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