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Commit 69bc0990 authored by Simon Pilgrim's avatar Simon Pilgrim
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[DAGCombiner] Enable SimplifyDemandedBits vector support for TRUNCATE (REAPPLIED).

Add DemandedElts support inside the TRUNCATE analysis.

REAPPLIED - this was reverted by @hans at rGa51226057fc3 due to an issue with vector shift amount types, which was fixed in rG935bacd3a724 and an additional test case added at rG0ca81b90d19d

Differential Revision: https://reviews.llvm.org/D56387
parent 294e2544
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