[PATCH] D82441: [PowerPC] add a target hook shouldHoistCheapInstructions for machine licm to hoist cheap instruction on PowerPC

[ChenZheng via Phabricator via llvm-commits]

shchenz added a comment.

**NOTE**: I have not added a test case for this patch. The case is a little hard to construct. 
Currently, most cheap instructions on PowerPC are rematerializable. Rematerializable instructions will be hoisted before we check the register pressure in `CanCauseHighRegPressure`.

Since the logic here is quite straightforward, I leave this patch without a test case. I hope this is ok.

I will post another patch related to hoist rematerializable instructions based on this one. That patch will have a case to indicate the benefit of this hook.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D82441/new/

https://reviews.llvm.org/D82441