Alexey Bataev e7c3eaa8ae [SLP]Do not emit extra shuffle for insertelements vectorization.
If the vectorized insertelements instructions form indentity subvector
(the subvector at the beginning of the long vector), it is just enough
to extend the vector itself, no need to generate inserting subvector
shuffle.

Differential Revision: https://reviews.llvm.org/D107494
2021-08-05 08:41:24 -07:00
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