[PATCH] D48278: [SelectionDAG] Fold redundant masking operations of shifted value

[Diogo N. Sampaio via Phabricator via llvm-commits]

dnsampaio updated this revision to Diff 155375.
dnsampaio marked 2 inline comments as done.
dnsampaio added a comment.

Only accepts instructions with 2 uses (AND / SHIFT operations). So that looping through the uses is not expensive, and we avoid it in most cases.
Removed recursive bit value computations(computeKnownBits).


https://reviews.llvm.org/D48278

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/FoldRedundantShiftedMasking.ll
  test/CodeGen/ARM/FoldRedundantShiftedMasking.ll
  test/CodeGen/X86/FoldRedundantShiftedMasking.roll.ll
  test/CodeGen/X86/pr32329.ll

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