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Commit 1ba5c550 authored by Simon Pilgrim's avatar Simon Pilgrim
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[DAG] Improve folding (sext_in_reg (*_extend_vector_inreg x)) -> (sext_vector_inreg x) 

Extend this to support ComputeNumSignBits of the (used) source vector elements so that we can handle more than just the case where we're sext_in_reg from the source element signbit.

Noticed while investigating the poor codegen in D98587.
parent 28379915
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