[PATCH] D144283: [X86] Make `(and/or (icmp eq/ne A,C0), (icmp eq/ne A,C1))` where `IsPow(dif(C0,C1))` work for more patterns.

[Noah Goldstein via Phabricator via llvm-commits]

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`(and/or (icmp eq/ne A,C0), (icmp eq/ne A,C1))` can be lowered to
`(icmp eq/ne (and (sub A, (smin C0, C1)), (not (sub (smax C0, C1), (smin C0, C1)))), 0)`
generically if `(sub (smax C0, C1), (smin C0,C1))` is a power of 2.

This covers the existing case of `(and/or (icmp eq/ne A, C_Pow2),(icmp eq/ne A, -C_Pow2))`
as well as other cases.

Alive2 Links:
EQ: https://alive2.llvm.org/ce/z/mLJiUW
NE: https://alive2.llvm.org/ce/z/TKnzUr

foobar


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144283

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/X86/icmp-pow2-dif.ll
  llvm/test/CodeGen/X86/setcc-logic.ll

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