Alexey Bataev ac254fc055 [SLP]Improve tryToGatherExtractElements by using per-register analysis.
Currently tryToGatherExtractElements function analyzes the whole vector,
regrdless number of actual registers, used in this vector. It may
prevent some optimizations, because per-register analysis may allow to
simplify the final code by reusing more already emitted vectors and
better shuffles.

Differential Revision: https://reviews.llvm.org/D148855
2023-11-06 07:29:27 -08:00
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