[PATCH] D48278: [SelectionDAG]Reduce masked data movement chains and memory access widths pt2

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

dnsampaio created this revision.
dnsampaio added reviewers: samparker, SjoerdMeijer, javed.absar.
Herald added a subscriber: llvm-commits.

Allow to reduce redundant shift masks.
For example:
x1 = x & 0xAB00
x2 = (x >> 8) & 0xAB
can be reduced to:
x1 = x & 0xAB00
x2 = x1 >> 8


Repository:
  rL LLVM

https://reviews.llvm.org/D48278

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/2018_05_29_FoldRedundantMask.ll
  test/CodeGen/X86/pr32329.ll

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