[PATCH] D104636: [LoopIdiom] [LoopNest] let the pass deal with runtime memset size

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

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The LoopNestIdiomRecognize is a LoopNestPass that feeds LoopNest into
LoopIdiomRecognize. The main difference from LoopIdiomRecognize is it
allows runtime-determined store size optimization by versioning and creates
runtime checks on the top-level loop. The reason to only version on the
top-level loop is to avoid the exponential growth of versioning.

LoopNestIdiomRecognize would perform identical to the current
LoopIdiomRecognize if the runtime detects negative value or too-large values.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104636

Files:
  llvm/include/llvm/Transforms/Scalar/LoopIdiomRecognize.h
  llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  llvm/test/Transforms/LoopIdiom/memset-runtime.ll

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