[PATCH] D135581: [MemCpyOpt] Use usub_sat in processMemSetMemCpyDependence

[Bjorn Pettersson via Phabricator via llvm-commits]

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Select usub_sat directly for the memset length calculation, instead
of using a cmp/sub/select pattern than InstCombine later would turn
into usub_sat.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135581

Files:
  llvm/include/llvm/IR/IRBuilder.h
  llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
  llvm/test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll
  llvm/test/Transforms/MemCpyOpt/opaque-ptr.ll

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