[PATCH] D71563: [SCEV] Recognise the hardwareloop "loop.decrement.reg" intrinsic

[Sanjoy Das (Work Account) via Phabricator via llvm-commits]

sanjoy.google added a comment.

`llvm.loop.decrement.reg` is not documented in the langref.  Is this a target specific thing?

Also, is the entire gamut of optimizations this enables OK?  For instance, would it be okay to LFTR replace the trip count of the loop such that it doesn't use the `loop_decrement_reg` intrinsic anymore?


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  https://reviews.llvm.org/D71563/new/

https://reviews.llvm.org/D71563