[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


Hi Peter,

> 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 The question is,  does “not tracking liveness” mean this info is invalid / out-of-date ???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?

Cheers,
-Quentin

>  
>  
> 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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