Roman Lebedev df9597cf5a
[X86][CostModel] X86TTIImpl::getShuffleCost(): subvector insertions are cheap
This is similar to the subvector extractions,
except that the 0'th subvector isn't free to insert,
because we generally don't know whether or not
the upper elements need to be preserved:
https://godbolt.org/z/rsxP5W4sW

This is needed to avoid regressions in D100684

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D100698
2021-04-19 13:24:58 +03:00
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