[PATCH] D34762: [JumpThreading] Add a pattern to TryToUnfoldSelectInCurrBB()

[Haicheng Wu via Phabricator via llvm-commits]

haicheng created this revision.

Add the following pattern to TryToUnfoldSelectInCurrBB()

  bb:
     %p = phi [0, %bb1], [1, %bb2], [0, %bb3], [1, %bb4], ...
     %c = cmp %p, 0
     %s = select %c, trueval, falseval

The Select in the above pattern will be unfolded and then jump-threaded.  The current implementation does not allow CMP in the middle of PHI and Select.


Repository:
  rL LLVM

https://reviews.llvm.org/D34762

Files:
  lib/Transforms/Scalar/JumpThreading.cpp
  test/Transforms/JumpThreading/select.ll

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