Sam Parker 59efb8cb5b [DAGCombine] Improve ReduceLoadWidth for SRL
If the SRL node is only used by an AND, we may be able to set the
ExtVT to the width of the mask, making the AND redundant. To support
this, another check has been added in isLegalNarrowLoad which queries
whether the load is valid.

Differential Revision: https://reviews.llvm.org/D41350

llvm-svn: 321259
2017-12-21 12:55:04 +00:00
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