[LLVMdev] InlineSpiller Questions

[Jakob Stoklund Olesen]

On Sep 20, 2012, at 10:59 AM, <dag at cray.com> wrote:

> Jakob Stoklund Olesen <stoklund at 2pi.dk> writes:
> 
>>> Are all of those sibling values guaranteed to ultimately derive from the
>>> same def, in the sense that they can be traced through copies, phis,
>>> etc. back to a single instruction?
>> 
>> They are known the all come from the same value in the original live range from before live range splitting.
> 
> Ok, that's exactly what I need.
> 
>> The defining instruction may not exists any longer. It could have been
>> rematerialized somewhere else. It could also have been PHI.
> 
> Ok, so in that case the traced-to VNInfo will have a def SlotIndex of
> Slot_Block or something?

VNI->isPHIDef()