[PATCH] D37832: Eliminate PHI (int typed) which is only used by inttoptr

[David Li via Phabricator via llvm-commits]

davidxl created this revision.

SCEV  (and AA) has trouble understanding inttoptr/ptrtoint instructions and thus produces conservative analysis results, which blocks transformations such as loop vectorizer.  See https://reviews.llvm.org/D37419 for background.

Instead of teaching SCEV to see through those bitcast operations, this patch improves instcombiner to eliminate those operations when possible.


https://reviews.llvm.org/D37832

Files:
  lib/Transforms/InstCombine/InstCombineInternal.h
  lib/Transforms/InstCombine/InstCombinePHI.cpp
  test/Transforms/InstCombine/intptr1.ll
  test/Transforms/InstCombine/intptr2.ll
  test/Transforms/InstCombine/intptr3.ll
  test/Transforms/InstCombine/intptr4.ll

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