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Commit cd7650c1 authored by Matt Arsenault's avatar Matt Arsenault
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GlobalISel: Implement fewerElementsVector for G_SEXT_INREG 

Start using a new strategy with a combination of merge and unmerges.

This allows scalarizing before lowering, which in cases like
<2 x s128> avoids producing giant illegal shifts.
parent f26ff8c9
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