[PATCH] D50432: [DAGCombiner] Reduce load widths of shifted masks

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: spatel, RKSimon, niravd, efriedma.
Herald added a reviewer: javed.absar.

During combining, ReduceLoadWdith is used to combine AND nodes that mask loads into narrow loads. This patch allows the mask to be a shifted constant. This results in a narrow load which is then left shifted to compensate for the new offset.


https://reviews.llvm.org/D50432

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/and-load-combine.ll
  test/CodeGen/X86/fp128-i128.ll

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