[PATCH] D54827: Handle 3 sequential branches while the first two can infer the third one.

[luo xionghu via Phabricator via llvm-commits]

yinyuefengyi created this revision.
yinyuefengyi added reviewers: nemanjai, hfinkel, echristo, spatel, majnemer.
Herald added a subscriber: hiraditya.

e.g. if a>=b && a!=b, then we can infer a>b. this patch will combine the
a>=b and a!=b into a new compare instruction a>b first, then do the next
level implication calculation by reusing the existing isImpliedCondition
function.


Repository:
  rL LLVM

https://reviews.llvm.org/D54827

Files:
  llvm/include/llvm/IR/Instructions.h
  llvm/lib/IR/Instructions.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/Transforms/SimplifyCFG/branch-fold-three.ll

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