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Commit 07839219 authored by Simon Pilgrim's avatar Simon Pilgrim
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[CostModel] Treat Identity shuffle masks as zero cost 

As discussed on D47985, identity shuffle masks should probably be free.

I've limited this to the case where the input and output types all match - but we could probably accept all cases.

Differential Revision: https://reviews.llvm.org/D47986

llvm-svn: 334506
parent 76969eaf
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