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[CostModel][X86][ARM] Teach getCastInstrCost to include the splitting factor when handling operations that type legalize to the same number of subvectors or scalar components

Authored by craig.topper on Apr 24 2020, 12:22 PM.



Previously, we just always returned 1. But that ignores that we have to do the operation for each subvector or scalar component.

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craig.topper created this revision.Apr 24 2020, 12:22 PM
RKSimon accepted this revision.Apr 24 2020, 12:54 PM

LGTM - cheers

This revision is now accepted and ready to land.Apr 24 2020, 12:54 PM
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