[PATCH] D108112: [LoopIdiom] let LIR fold memset pointer / stride SCEV regarding loop guards

[Yueh-Ting Chen via Phabricator via llvm-commits]

eopXD added a comment.

> No, i mean that the ScalarEvolution should perform this canonicalization internally, in ScalarEvolution::getSignExtendExpr()
> It already does it, in fact: https://github.com/llvm/llvm-project/blob/0dc6b597db4d8b25f3df96a8f6574be732e18fdd/llvm/lib/Analysis/ScalarEvolution.cpp#L2100-L2103

I see. Thank you for the elaboration.

> Though perhaps that is not feasible because we don't know the loop we're after when in `ScalarEvolution::getSignExtendExpr()`.

I agree.


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