[PATCH] D156610: [WIP][LSR] Transform div instruction to add in loop

[LuoYuanke via Phabricator via llvm-commits]

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Some target don't have div instruction or div is very expensive. For large
integer type, div is transformed to non-div instruction by expand-div-rem
pass. Transform div into add in loop help to improve the performance.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156610

Files:
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/test/Transforms/LoopStrengthReduce/div.ll

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