[PATCH] D148593: [InstCombine] Add transforms for `(icmp eq/ne (trunc x),(truncOrZext(y)))`->`(icmp eq/ne x,y)`

[Noah Goldstein via Phabricator via llvm-commits]

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Three transforms (all commutative):

  `(icmp eq/ne (trunc x),(trunc y))`:
      -> if `sizeof(x) == sizeof(y)`:
          -> `(icmp eq/ne (trunc x),(trunc y)`
              - https://alive2.llvm.org/ce/z/rAj52G
      -> if `sizeof(x) < sizeof(y)`:
          -> `(icmp eq/ne x,(trunc y)`
              - https://alive2.llvm.org/ce/z/vyju55
  `(icmp eq/ne (trunc x),(zext y)`
          -> `(icmp eq/ne x,(zext y)`
              - https://alive2.llvm.org/ce/z/mtKZzm


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148593

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/test/Transforms/InstCombine/eq-of-parts.ll
  llvm/test/Transforms/InstCombine/icmp-of-trunc-ext.ll

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