[PATCH] D143368: [InstCombine] Look through truncate to fold icmp with intrinsics

[chenglin.bi via Phabricator via llvm-commits]

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The output of intrinsic functions like ctpop, cttz, ctlz have limited range from 0 to bitwidth. So if the truncate destination type can hold the source bitwidth size, we can just ignore the truncate and use the truncate src to do combination.


https://reviews.llvm.org/D143368

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/lib/Transforms/InstCombine/InstCombineInternal.h
  llvm/test/Transforms/InstCombine/cmp-intrinsic.ll

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