[PATCH] D108141: [PowerPC][AIX] Set the HasAlloca flag in the AIX Traceback Table only if R31 is used as a frame pointer

[Kai Luo via Phabricator via llvm-commits]

lkail added a comment.

Is the `AllocaUsed` bit indicating LLVM instruction `alloca` is used? If so, I'm assuming this patches refers to dynamic alloca, since r31 is used under this condition. There is a flag in `MachineFrameInfo::hasVarSizedObjects` for dynamic alloca. There are some other cases also using r31 as frame pointer, so use r31 here might be not accurate.


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  https://reviews.llvm.org/D108141/new/

https://reviews.llvm.org/D108141