[PATCH] D63026: [InstCombine] Fix fold order for icmp pred (and (sh X, Y), C), 0.

[Huihui Zhang via Phabricator via llvm-commits]

huihuiz created this revision.
huihuiz added reviewers: lebedev.ri, efriedma, spatel, craig.topper.
Herald added a project: LLVM.

To generate simplified IR, make sure fold

  ((X << Y) & signbit) ==/!= 0) -> (X << Y) >=/< 0;
  (X << Y) & ~C ==/!= 0 -> (X << Y) </>= C+1, C+1 is power of 2;

are scheduled before fold

  ((X << Y) & C) == 0 -> (X & (C >> Y)) == 0.


Repository:
  rL LLVM

https://reviews.llvm.org/D63026

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-shift-and-negC.ll
  test/Transforms/InstCombine/icmp-shift-and-signbit.ll

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