[llvm-dev] Liveness of virtual registers

Quentin Colombet via llvm-dev llvm-dev at lists.llvm.org
Thu Aug 11 12:36:59 PDT 2016

My recollection is unlike kill flags, the dead flags are required for something that is dead.
Given it is not enforced in the verifier, this is possible we drifted from that goal or simply I misremember :).

> On Jul 28, 2016, at 2:21 PM, Krzysztof Parzyszek via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> On 7/28/2016 4:10 PM, Matthias Braun wrote:
>> I re-checked the RegisterPressure.cpp code as well and it does not rely on dead-flags either (if there is no dead flag it queries the liveinterval for it). So it seems you are right with the statement of dead flags being optional.
> Cool.  Thanks for double-checking.
> -Krzysztof
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